#include <opennurbs_viewport.h>

Inheritance diagram for ON_Viewport:

Public Member Functions
	ON_Viewport ()=default

	ON_Viewport (const ON_Viewport &)=default

	~ON_Viewport ()=default

ON_3dVector	CameraDirection () const

bool	CameraDirectionIsLocked () const

ON_3dPoint	CameraLocation () const

bool	CameraLocationIsLocked () const

ON_3dVector	CameraUp () const

bool	CameraUpIsLocked () const

ON_3dVector	CameraX () const
	these do not check for a valid camera orientation More...

ON_3dVector	CameraY () const
	unit up vector More...

ON_3dVector	CameraZ () const
	unit vector in -CameraDirection More...

bool	ChangeToParallelProjection (bool bSymmetricFrustum)

bool	ChangeToPerspectiveProjection (double target_distance, bool bSymmetricFrustum, double lens_length)

bool	ChangeToSymmetricFrustum (bool bLeftRightSymmetric, bool bTopBottomSymmetric, double target_distance)

bool	ChangeToTwoPointPerspectiveProjection (double target_distance, ON_3dVector up, double lens_length)

void	ChangeViewportId (const ON_UUID &viewport_id)

double	ClipCoordDepthBias (double relative_depth_bias, double clip_z, double clip_w) const

ON_Xform	ClipModInverseXform () const

ON_Xform	ClipModXform () const

bool	ClipModXformIsIdentity () const

int	Dimension () const override

bool	DollyCamera (const ON_3dVector &dolly_vector)

bool	DollyFrustum (double dolly_distance)
	Moves frustum's clipping planes. More...

void	Dump (ON_TextLog &) const override

bool	Extents (double half_view_angle, const ON_3dPoint &center, double radius)

bool	Extents (double half_view_angle, const ON_BoundingBox &world_bbox)

double	FrustumBottom () const

ON_3dPoint	FrustumCenterPoint (double target_distance) const

double	FrustumFar () const

double	FrustumHeight () const
	top - bottom More...

bool	FrustumIsLeftRightSymmetric () const

bool	FrustumIsTopBottomSymmetric () const

double	FrustumLeft () const

double	FrustumMaximumDiameter () const

double	FrustumMinimumDiameter () const

double	FrustumNear () const

double	FrustumRight () const

double	FrustumTop () const

double	FrustumWidth () const
	right - left More...

bool	GetBBox (double boxmin, double boxmax, bool bGrowBox=false) const override
	virtual ON_Geometry GetBBox override More...

int	GetBoundingBoxDepth (ON_BoundingBox bbox, const ON_Xform bbox_xform, double near_dist, double *far_dist, bool bGrowNearFar) const

bool	GetBoundingBoxDepth (ON_BoundingBox bbox, double near_dist, double far_dist, bool bGrowNearFar=false) const

bool	GetBoundingBoxProjectionExtents (ON_BoundingBox bbox, ON_Interval &x_extents, ON_Interval &y_extents) const

bool	GetCamera35mmLenseLength (double *lens_length) const
	Same as GetCamera35mmLensLength() with "lens" misspelled. More...

bool	GetCamera35mmLensLength (double *lens_length) const

bool	GetCameraAngle (double half_diagonal_angle, double half_vertical_angle, double *half_horizontal_angle) const

bool	GetCameraAngle (double *half_smallest_angle) const

bool	GetCameraExtents (const ON_BoundingBox &, ON_BoundingBox &cambbox, int bGrowBox=false) const

bool	GetCameraExtents (int, int, const double *, ON_BoundingBox &cambbox, int bGrowBox=false) const

bool	GetCameraExtents (ON_3dPoint &, double, ON_BoundingBox &cambox, int bGrowBox=false) const

bool	GetCameraFrame (class ON_Plane &camera_frame) const

bool	GetCameraFrame (double , double , double , double ) const
	returns true if current camera orientation is valid More...

bool	GetClipCoordDepthBiasXform (double relative_depth_bias, ON_Xform &clip_bias) const

bool	GetCoordinateSprite (int, int, int, int[3], double[3][2]) const

bool	GetDollyCameraVector (int screen_x0, int screen_y0, int screen_x1, int screen_y1, double proj_plane_dist, ON_3dVector &dolly_vector) const

bool	GetFarPlane (ON_Plane &far_plane) const

bool	GetFarPlaneEquation (ON_PlaneEquation &far_plane_equation) const

bool	GetFarRect (ON_3dPoint &left_bottom, ON_3dPoint &right_bottom, ON_3dPoint &left_top, ON_3dPoint &right_top) const

bool	GetFrustum (double left, double right, double bottom, double top, double near_dist=nullptr, double far_dist=nullptr) const

bool	GetFrustumAspect (double &) const
	Returns frustum's width/height. More...

bool	GetFrustumBottomPlane (ON_Plane &bottom_plane) const

bool	GetFrustumBottomPlaneEquation (ON_PlaneEquation &bottom_plane_equation) const

bool	GetFrustumCenter (double *) const
	Returns world coordinates of frustum's center. More...

bool	GetFrustumLeftPlane (ON_Plane &left_plane) const

bool	GetFrustumLeftPlaneEquation (ON_PlaneEquation &left_plane_equation) const

bool	GetFrustumLine (double screenx, double screeny, ON_Line &world_line) const

bool	GetFrustumRightPlane (ON_Plane &right_plane) const

bool	GetFrustumRightPlaneEquation (ON_PlaneEquation &right_plane_equation) const

bool	GetFrustumTopPlane (ON_Plane &top_plane) const

bool	GetFrustumTopPlaneEquation (ON_PlaneEquation &top_plane_equation) const

bool	GetNearPlane (ON_Plane &near_plane) const

bool	GetNearPlaneEquation (ON_PlaneEquation &near_plane_equation) const

bool	GetNearRect (ON_3dPoint &left_bottom, ON_3dPoint &right_bottom, ON_3dPoint &left_top, ON_3dPoint &right_top) const

bool	GetPointDepth (ON_3dPoint point, double near_dist, double far_dist, bool bGrowNearFar=false) const

bool	GetPointDepth (ON_3dPoint point, double *view_plane_depth) const

bool	GetScreenPort (int left, int right, int port_bottom, int port_top, int port_near=nullptr, int port_far=nullptr) const

bool	GetScreenPortAspect (double &) const
	port's \|width/height\| More...

bool	GetSphereDepth (ON_Sphere sphere, double near_dist, double far_dist, bool bGrowNearFar=false) const

bool	GetViewPlane (double view_plane_depth, ON_Plane &view_plane) const

bool	GetViewPlaneEquation (double view_plane_depth, ON_PlaneEquation &view_plane_equation) const

bool	GetViewPlaneRect (double view_plane_depth, ON_3dPoint &left_bottom, ON_3dPoint &right_bottom, ON_3dPoint &left_top, ON_3dPoint &right_top) const

void	GetViewScale (double x, double y) const

void	GetViewScale (double x, double y, double *z) const

bool	GetWorldToScreenScale (double frustum_depth, double *pixels_per_unit) const

bool	GetWorldToScreenScale (ON_3dPoint world_point, double *pixels_per_unit) const
	display tools More...

bool	GetXform (ON::coordinate_system srcCS, ON::coordinate_system destCS, ON_Xform &matrix) const

void	Initialize ()

int	InViewFrustum (bool bInfiniteFrustum, const ON_BoundingBox &bbox, const ON_Xform *bbox_xform) const

int	InViewFrustum (const ON_BoundingBox &bbox) const

int	InViewFrustum (int count, const ON_3dPoint *p) const

int	InViewFrustum (int count, const ON_3fPoint *p) const

int	InViewFrustum (int count, const ON_4dPoint *p) const

int	InViewFrustum (ON_3dPoint P) const

bool	IsCameraFrameWorldPlan (int , int , int *)

bool	IsParallelProjection () const

bool	IsPerspectiveProjection () const

bool	IsTwoPointPerspectiveProjection () const

bool	IsValid (class ON_TextLog *text_log=nullptr) const override

bool	IsValidCamera () const

bool	IsValidCameraFrame () const

bool	IsValidFrustum () const

ON_Viewport &	operator= (const ON_Viewport &)=default

double	PerspectiveMinNearDist () const

double	PerspectiveMinNearOverFar () const

ON::view_projection	Projection () const

bool	Read (ON_BinaryArchive &) override

int	ScreenPortHeight () const

ON_2iSize	ScreenPortSize () const

int	ScreenPortWidth () const

bool	SetCamera (const ON_Viewport &source_viewport, bool bBreakLocks)

bool	SetCamera35mmLenseLength (double lens_length)
	Same as SetCamera35mmLensLength() with "lens" misspelled. More...

bool	SetCamera35mmLensLength (double lens_length)

bool	SetCameraAngle (double half_smallest_angle)

bool	SetCameraDirection (const ON_3dVector &)

void	SetCameraDirectionLock (bool bLockCameraDirection)

bool	SetCameraLocation (const ON_3dPoint &)

void	SetCameraLocationLock (bool bLockCameraLocation)

bool	SetCameraUp (const ON_3dVector &)

void	SetCameraUpLock (bool bLockCameraUp)

bool	SetFrustum (const ON_Viewport &source_viewport, bool bBreakLocks)

bool	SetFrustum (double left, double right, double bottom, double top, double near_dist, double far_dist)

bool	SetFrustumAspect (double)

void	SetFrustumLeftRightSymmetry (bool bForceLeftRightSymmetry)

bool	SetFrustumNearFar (const double bboxmin, const double bboxmax)

bool	SetFrustumNearFar (const double *center, double radius)

bool	SetFrustumNearFar (double near_dist, double far_dist)

bool	SetFrustumNearFar (double near_dist, double far_dist, double min_near_dist, double min_near_over_far, double target_dist)

bool	SetFrustumNearFar (double near_dist, double far_dist, double min_near_dist, double min_near_over_far, double target_dist, double relative_depth_bias)

void	SetFrustumTopBottomSymmetry (bool bForceTopBottomSymmetry)

void	SetPerspectiveClippingPlaneConstraints (unsigned int depth_buffer_bit_depth)

void	SetPerspectiveMinNearDist (double min_near_dist)

void	SetPerspectiveMinNearOverFar (double min_near_over_far)

bool	SetProjection (ON::view_projection projection)

bool	SetScreenPort (int port_left, int port_right, int port_bottom, int port_top, int port_near=0, int port_far=0)

bool	SetTargetPoint (ON_3dPoint target_point)

bool	SetViewportId (const ON_UUID &viewport_id)

bool	SetViewScale (double x, double y)

bool	SetViewScale (double x, double y, double z)

ON_Viewport *	ShallowCopy (ON_Viewport *destination) const

double	TargetDistance (bool bUseFrustumCenterFallback) const

ON_3dPoint	TargetPoint () const

bool	Transform (const ON_Xform &) override

void	UnlockCamera ()
	sets all camera locks to false More...

void	UnlockFrustumSymmetry ()
	sets all frustum symmetry locks to false More...

ON_UUID	ViewportId (void) const

ON_SHA1_Hash	ViewProjectionContentHash () const

bool	Write (ON_BinaryArchive &) const override

bool	ZoomToScreenRect (int screen_x0, int screen_y0, int screen_x1, int screen_y1)
	ZoomToScreenRect() may change camera and frustum settings. More...

Public Member Functions inherited from ON_Geometry
	ON_Geometry ()=default

	ON_Geometry (const ON_Geometry &)=default

	~ON_Geometry ()=default

ON_BoundingBox	BoundingBox () const

virtual class ON_Brep *	BrepForm (class ON_Brep *brep=nullptr) const

virtual void	ClearBoundingBox ()

virtual ON_COMPONENT_INDEX	ComponentIndex () const

virtual bool	EvaluatePoint (const class ON_ObjRef &objref, ON_3dPoint &P) const

bool	GetBoundingBox (ON_3dPoint &bbox_min, ON_3dPoint &bbox_max, bool bGrowBox=false) const

bool	GetBoundingBox (ON_BoundingBox &bbox, bool bGrowBox=false) const

virtual bool	GetTightBoundingBox (class ON_BoundingBox &tight_bbox, bool bGrowBox=false, const class ON_Xform *xform=nullptr) const

virtual bool	HasBrepForm () const

virtual bool	IsDeformable () const

virtual bool	IsMorphable () const

virtual bool	MakeDeformable ()

virtual bool	Morph (const class ON_SpaceMorph &morph)

ON_Geometry &	operator= (const ON_Geometry &)=default

bool	Rotate (double rotation_angle, const ON_3dVector &rotation_axis, const ON_3dPoint &rotation_center)

bool	Rotate (double sin_angle, double cos_angle, const ON_3dVector &rotation_axis, const ON_3dPoint &rotation_center)

bool	Scale (double scale_factor)

virtual bool	SwapCoordinates (int i, int j)

const ON_BoundingBox	TightBoundingBox () const

bool	Translate (const ON_3dVector &translation_vector)

Public Member Functions inherited from ON_Object
	ON_Object () ON_NOEXCEPT

	ON_Object (const ON_Object &)

virtual	~ON_Object ()

virtual ON_AggregateComponentStatus	AggregateComponentStatus () const

bool	AttachUserData (class ON_UserData *pUserData)

unsigned int	ClearAllComponentStates () const

virtual unsigned int	ClearComponentStates (ON_COMPONENT_INDEX component_index, ON_ComponentStatus states_to_clear) const

virtual unsigned int	ClearComponentStates (ON_ComponentStatus states_to_clear) const

void	CopyUserData (const ON_Object &source_object)

unsigned int	CopyUserData (const ON_Object &source_object, ON_UUID source_userdata_item_id, ON_Object::UserDataConflictResolution userdata_conflict_resolution)

virtual ON__UINT32	DataCRC (ON__UINT32 current_remainder) const

virtual bool	DeleteComponents (const ON_COMPONENT_INDEX *ci_list, size_t ci_count)

virtual void	DestroyRuntimeCache (bool bDelete=true)

bool	DetachUserData (class ON_UserData *pUserData)

void	EmergencyDestroy ()

class ON_UserData *	FirstUserData () const

virtual unsigned int	GetComponentsWithSetStates (ON_ComponentStatus states_filter, bool bAllEqualStates, ON_SimpleArray< ON_COMPONENT_INDEX > &components) const

class ON_UserData *	GetUserData (const ON_UUID &userdata_uuid) const

bool	GetUserString (const wchar_t *key, ON_wString &string_value) const

int	GetUserStringKeys (ON_ClassArray< ON_wString > &user_string_keys) const

int	GetUserStrings (ON_ClassArray< ON_UserString > &user_strings) const

bool	IsCorrupt (bool bRepair, bool bSilentError, class ON_TextLog *text_log) const

bool	IsKindOf (const ON_ClassId *pClassId) const

virtual void	MarkAggregateComponentStatusAsNotCurrent () const

virtual void	MemoryRelocate ()

virtual ON_UUID	ModelObjectId () const

void	MoveUserData (ON_Object &source_object)

unsigned int	MoveUserData (ON_Object &source_object, ON_UUID source_userdata_item_id, ON_Object::UserDataConflictResolution userdata_conflict_resolution, bool bDeleteAllSourceItems)

virtual ON::object_type	ObjectType () const

ON_Object &	operator= (const ON_Object &)

void	PurgeUserData ()

virtual unsigned int	SetComponentStates (ON_COMPONENT_INDEX component_index, ON_ComponentStatus states_to_set) const

virtual unsigned int	SetComponentStatus (ON_COMPONENT_INDEX component_index, ON_ComponentStatus status_to_copy) const

bool	SetUserString (const wchar_t key, const wchar_t string_value)

int	SetUserStrings (int count, const ON_UserString *user_strings, bool bReplace)

virtual unsigned int	SizeOf () const

bool	ThisIsNullptr (bool bSilentError) const

void	TransformUserData (const class ON_Xform &xform)

virtual bool	UpdateReferencedComponents (const class ON_ComponentManifest &source_manifest, const class ON_ComponentManifest &destination_manifest, const class ON_ManifestMap &manifest_map)

int	UserStringCount () const

Static Public Member Functions
static void	GetPerspectiveClippingPlaneConstraints (ON_3dPoint camera_location, unsigned int depth_buffer_bit_depth, double min_near_dist, double min_near_over_far)

static bool	IsValidCameraLocation (ON_3dPoint candidate_point)

static bool	IsValidCameraUpOrDirection (ON_3dVector candidate_vector)

Static Public Attributes
static const ON_3dVector	Default3dCameraDirection
	(-0.43301270189221932338186158537647,0.75,-0.5) More...

static const ON_3dPoint	DefaultCameraLocation
	(0.0,0.0,100.0) More...

static const double	DefaultFarDist
	1000.0 More...

static const double	DefaultMinNearDist
	0.0001 More...

static const double	DefaultMinNearOverFar
	0.0001 More...

static const double	DefaultNearDist
	0.005 More...

static const ON_Viewport	DefaultPerspectiveViewZUp

static const ON_Viewport	DefaultTopViewYUp

Static Public Attributes inherited from ON_Geometry
const static ON_Geometry	Unset

Protected Attributes
bool	m_bLockCamDir = false

bool	m_bLockCamLoc = false

bool	m_bLockCamUp = false

bool	m_bValidCamera = true

bool	m_bValidCameraFrame = true

bool	m_bValidFrustum = true

bool	m_bValidPort = false

ON_3dVector	m_CamDir = -ON_3dVector::ZAxis
	from camera towards view (nonzero and not parallel to m_CamUp) More...

ON_3dPoint	m_CamLoc = ON_Viewport::DefaultCameraLocation
	camera location More...

ON_3dVector	m_CamUp = ON_3dVector::YAxis
	(nonzero and not parallel to m_CamDir) More...

ON_3dVector	m_CamX = ON_3dVector::XAxis
	The camera frame vectors are properly initialized by SetCamera() More...

ON_3dVector	m_CamY = ON_3dVector::YAxis

ON_3dVector	m_CamZ = ON_3dVector::ZAxis

double	m_frus_bottom = -20.0
	frus_bottom < frus_top More...

double	m_frus_far = ON_Viewport::DefaultFarDist

double	m_frus_left = -20.0
	frus_left < frus_right More...

double	m_frus_near = ON_Viewport::DefaultMinNearDist
	0 < frus_near < frus_far More...

double	m_frus_right = 20.0

double	m_frus_top = 20.0

unsigned char	m_frustum_symmetry_flags = 0

int	m_port_bottom = 0
	port_bottom != port_top More...

int	m_port_far = 1

int	m_port_left = 0
	port_left != port_right More...

int	m_port_near = 0

int	m_port_right = 1000

int	m_port_top = 1000

ON::view_projection	m_projection = ON::parallel_view
	Camera Settings: ///////////////////////////////////////////////. More...

ON_3dPoint	m_target_point = ON_3dPoint::UnsetPoint

Additional Inherited Members
Public Types inherited from ON_Object
enum	UserDataConflictResolution : unsigned char { UserDataConflictResolution::destination_object = 0, UserDataConflictResolution::source_object = 1, UserDataConflictResolution::source_copycount_gt = 2, UserDataConflictResolution::source_copycount_ge = 3, UserDataConflictResolution::destination_copycount_gt = 4, UserDataConflictResolution::destination_copycount_ge = 5, UserDataConflictResolution::delete_item = 6 }

Detailed Description

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF MERCHANTABILITY ARE HEREBY DISCLAIMED.

For complete openNURBS copyright information see http://www.opennurbs.org. Class ON_Viewport

This object represents a viewing frustum

Constructor & Destructor Documentation

◆ ON_Viewport() [1/2]

ON_Viewport::ON_Viewport ( )

default

Construction Default constructor creates a copy of ON_Viewport::DefaultTopViewYUp;

◆ ~ON_Viewport()

ON_Viewport::~ON_Viewport ( )

default

◆ ON_Viewport() [2/2]

ON_Viewport::ON_Viewport ( const ON_Viewport & )

default

Member Function Documentation

◆ CameraDirection()

ON_3dVector ON_Viewport::CameraDirection ( ) const

◆ CameraDirectionIsLocked()

bool ON_Viewport::CameraDirectionIsLocked ( ) const

◆ CameraLocation()

ON_3dPoint ON_Viewport::CameraLocation ( ) const

◆ CameraLocationIsLocked()

bool ON_Viewport::CameraLocationIsLocked ( ) const

◆ CameraUp()

ON_3dVector ON_Viewport::CameraUp ( ) const

◆ CameraUpIsLocked()

bool ON_Viewport::CameraUpIsLocked ( ) const

◆ CameraX()

ON_3dVector ON_Viewport::CameraX ( ) const

these do not check for a valid camera orientation

unit to right vector

◆ CameraY()

ON_3dVector ON_Viewport::CameraY ( ) const

unit up vector

◆ CameraZ()

ON_3dVector ON_Viewport::CameraZ ( ) const

unit vector in -CameraDirection

◆ ChangeToParallelProjection()

bool ON_Viewport::ChangeToParallelProjection ( bool bSymmetricFrustum )

Description: Use this function to change projections of valid viewports from perspective to parallel. It will make common additional adjustments to the frustum so the resulting views are similar. The camera location and direction will not be changed. Parameters: bSymmetricFrustum - [in] True if you want the resulting frustum to be symmetric. Remarks: If the current projection is parallel and bSymmetricFrustum, FrustumIsLeftRightSymmetric() and FrustumIsTopBottomSymmetric() are all equal, then no changes are made and true is returned.

◆ ChangeToPerspectiveProjection()

bool ON_Viewport::ChangeToPerspectiveProjection	(	double	target_distance,
		bool	bSymmetricFrustum,
		double	lens_length
	)

Description: Use this function to change projections of valid viewports from parallel to perspective. It will make common additional adjustments to the frustum and camera location so the resulting views are similar. The camera direction and target point are not be changed. Parameters: target_distance - [in] If ON_UNSET_VALUE this parameter is ignored. Otherwise it must be > 0 and indicates which plane in the current view frustum should be preserved. bSymmetricFrustum - [in] True if you want the resulting frustum to be symmetric. lens_length - in 35 mm lens length to use when changing from parallel to perspective projections. If the current projection is perspective or lens_length is <= 0.0, then this parameter is ignored. Remarks: If the current projection is perspective and bSymmetricFrustum, FrustumIsLeftRightSymmetric() and FrustumIsTopBottomSymmetric() are all equal, then no changes are made and true is returned.

◆ ChangeToSymmetricFrustum()

bool ON_Viewport::ChangeToSymmetricFrustum	(	bool	bLeftRightSymmetric,
		bool	bTopBottomSymmetric,
		double	target_distance
	)

Description: If needed, adjust the current frustum so it has the specified symmetries and adjust the camera location so the target plane remains visible. Parameters: bLeftRightSymmetric - [in] If true, the frustum will be adjusted so left = -right. bTopBottomSymmetric - [in] If true, the frustum will be adjusted so top = -bottom. target_distance - [in] If projection is not perspective or target_distance is ON_UNSET_VALUE, this this parameter is ignored. If the projection is perspective and target_distance is not ON_UNSET_VALUE, then it must be > 0.0 and it is used to determine which plane in the old frustum will appear unchanged in the new frustum. bool Returns true if the returned viewport has a frustum with the specified symmetries.

◆ ChangeToTwoPointPerspectiveProjection()

bool ON_Viewport::ChangeToTwoPointPerspectiveProjection	(	double	target_distance,
		ON_3dVector	up,
		double	lens_length
	)

Description: Use this function to change projections of valid viewports to a two point perspective. It will make common additional adjustments to the frustum and camera location and direction so the resulting views are similar. Parameters: target_distance - [in] If ON_UNSET_VALUE this parameter is ignored. Otherwise it must be > 0 and indicates which plane in the current view frustum should be preserved. up - [in] This direction will be the locked up direction. Pass ON_3dVector::ZeroVector if you want to use the world axis direction that is closest to the current up direction. Pass CameraY() if you want to preserve the current up direction. lens_length - in 35 mm lens length to use when changing from parallel to perspective projections. If the current projection is perspective or lens_length is <= 0.0, then this parameter is ignored. Remarks: If the current projection is perspective and FrustumIsLeftRightSymmetric() is true and FrustumIsTopBottomSymmetric() is false, then no changes are made and true is returned.

◆ ChangeViewportId()

void ON_Viewport::ChangeViewportId ( const ON_UUID & viewport_id )

Description: EXPERT USER function to change the viewport's id. If you change the id, you risk damaging display and visibility relationships in the model. Parameters: viewport_id - [in]

◆ ClipCoordDepthBias()

double ON_Viewport::ClipCoordDepthBias	(	double	relative_depth_bias,
		double	clip_z,
		double	clip_w
	)		const

Description: Calculate the value to add to homogeneous "z" clipping coordinate that corresponds to moving the corresponding euclidean camera coordinate by relative_depth_bias*(far - near). Parameters: relative_depth_bias - [in] signed relative bias. = 0: no bias, > 0: bias towards frustum's near clipping plane < 0: bias towards frustum's far clipping plane When you have curves and points that are "on" shaded objects, values around 1/256 work well to move the wire objects in front of or behind shaded objects. clip_z [-in] clip_w [-in] clip_z and clip_w are the homogeneous "w" and "w" coordinates of a homogeneous clipping coordinate point. Returns: The clipping coordinate depth bias to add to the z-clipping coordinate that corresponds to adding cam_depth_bias to the z camera coordinate. Remarks: For perspective views, this bias is largest in the vicinity of the frustum's near clipping plane and smallest in the vicinity of the frustum's far clipping plane. For orthographic projections, this bias is constant.

◆ ClipModInverseXform()

ON_Xform ON_Viewport::ClipModInverseXform ( ) const

Description: Gets the m_clip_mod_inverse transformation; Returns: value of the m_clip_mod_inverse transformation.

◆ ClipModXform()

ON_Xform ON_Viewport::ClipModXform ( ) const

Description: Gets the m_clip_mod transformation; Returns: value of the m_clip_mod transformation.

◆ ClipModXformIsIdentity()

bool ON_Viewport::ClipModXformIsIdentity ( ) const

Returns: True if clip mod xform is identity.

◆ Dimension()

int ON_Viewport::Dimension ( ) const

overridevirtual

ON_Geometry overrides ////////////////////////////////////////////////////// Description: The dimension of a camera view frustum is 3.

Returns: 3

Remarks: This is virtual ON_Geometry function.

Reimplemented from ON_Geometry.

◆ DollyCamera()

bool ON_Viewport::DollyCamera ( const ON_3dVector & dolly_vector )

DollyCamera() does not update the frustum's clipping planes. To update the frustum's clipping planes call DollyFrustum(d) with d = dollyVector o cameraFrameZ. To convert screen locations into a dolly vector, use GetDollyCameraVector().

Parameters

dolly_vector Does not update frustum. To update frustum use DollyFrustum(d) with d = dollyVector o cameraFrameZ dolly vector in world coordinates

◆ DollyFrustum()

bool ON_Viewport::DollyFrustum ( double dolly_distance )

Moves frustum's clipping planes.

Parameters

dolly_distance distance to move in camera direction

◆ Dump()

void ON_Viewport::Dump ( ON_TextLog & ) const

overridevirtual

Description: Dumps debugging text description to a text log.

Parameters: dump_target - [in] text log

Remarks: This overrides the virtual ON_Object::Dump() function.

Reimplemented from ON_Object.

◆ Extents() [1/2]

bool ON_Viewport::Extents	(	double	half_view_angle,
		const ON_3dPoint &	center,
		double	radius
	)

Parameters

half_view_angle	1/2 smallest subtended view angle
center	(0 < angle < pi/2) 3d world coordinate bounding sphere center
radius	3d sphere radius

◆ Extents() [2/2]

bool ON_Viewport::Extents	(	double	half_view_angle,
		const ON_BoundingBox &	world_bbox
	)

Use Extents() as a quick way to set a viewport to so that bounding volume is inside of a viewports frustum. The view angle is used to determine the position of the camera.

Parameters

half_view_angle	1/2 smallest subtended view angle
world_bbox	(0 < angle < pi/2) 3d world coordinate bounding box

◆ FrustumBottom()

double ON_Viewport::FrustumBottom ( ) const

◆ FrustumCenterPoint()

ON_3dPoint ON_Viewport::FrustumCenterPoint ( double target_distance ) const

Description: Return a point on the central axis of the view frustum. This point is a good choice for a general purpose target point. Parameters: target_distance - [in] If target_distance > 0.0, then the distance from the returned point to the camera plane will be target_distance. Note that if the frustum is not symmetric, the distance from the returned point to the camera location will be larger than target_distance. If target_distance == ON_UNSET_VALUE and the frustum is valid with near > 0.0, then 0.5*(near + far) will be used as the target_distance. Returns: A point on the frustum's central axis. If the viewport or input is not valid, then ON_3dPoint::UnsetPoint is returned.

◆ FrustumFar()

double ON_Viewport::FrustumFar ( ) const

◆ FrustumHeight()

double ON_Viewport::FrustumHeight ( ) const

top - bottom

Returns: frustum right - frustum left

◆ FrustumIsLeftRightSymmetric()

bool ON_Viewport::FrustumIsLeftRightSymmetric ( ) const

◆ FrustumIsTopBottomSymmetric()

bool ON_Viewport::FrustumIsTopBottomSymmetric ( ) const

◆ FrustumLeft()

double ON_Viewport::FrustumLeft ( ) const

The near clipping plane stored in the Rhino 1.0 file is frequently very small and useless for high quality z-buffer based rendering. The far clipping value is not stored in the file. Use these functions to set the frustum's near and far clipping planes to appropriate values.

◆ FrustumMaximumDiameter()

double ON_Viewport::FrustumMaximumDiameter ( ) const

Returns: Maximum of fabs(FrustumWidth()) and fabs(FrustumHeight())

◆ FrustumMinimumDiameter()

double ON_Viewport::FrustumMinimumDiameter ( ) const

Returns: Minimum of fabs(FrustumWidth()) and fabs(FrustumHeight())

◆ FrustumNear()

double ON_Viewport::FrustumNear ( ) const

◆ FrustumRight()

double ON_Viewport::FrustumRight ( ) const

◆ FrustumTop()

double ON_Viewport::FrustumTop ( ) const

◆ FrustumWidth()

double ON_Viewport::FrustumWidth ( ) const

right - left

Returns: frustum right - frustum left

◆ GetBBox()

bool ON_Viewport::GetBBox	(	double *	boxmin,
		double *	boxmax,
		bool	bGrowBox = `false`
	)		const

overridevirtual

virtual ON_Geometry GetBBox override

Reimplemented from ON_Geometry.

◆ GetBoundingBoxDepth() [1/2]

int ON_Viewport::GetBoundingBoxDepth	(	ON_BoundingBox	bbox,
		const ON_Xform *	bbox_xform,
		double *	near_dist,
		double *	far_dist,
		bool	bGrowNearFar
	)		const

Description: Get near and far clipping distances of a bounding box. Parameters: bbox - [in] bounding box bbox_xform - [in] If not nullptr, this transformation to applied to the corners of bbox. It should have positive determinant for the results to be meaningful. Typically bbox_xform is used to pass an instance reference transformation. near_dist - [out] near distance of the box This value can be zero or negative when the camera location is inside bbox. far_dist - [out] far distance of the box This value can be equal to near_dist, zero or negative when the camera location is in front of the bounding box. bGrowNearFar - [in] If true and input values of near_dist and far_dist are not ON_UNSET_VALUE, the near_dist and far_dist are enlarged to include bbox. Returns: 0: The bounding box does not intersect the view frustum. 1: A proper subset of the bounding box is inside the view frustum and near_dist/far_dist were set. 2: The entire bounding box is inside the view frustum and near_dist/far_dist were set. Remarks: This function ignores the current value of the viewport's near and far settings. If the viewport is a perspective projection, the it intersects the semi infinite frustum volume with the bounding box and returns the near and far distances of the intersection. If the viewport is a parallel projection, it intersects the infinite view region with the bounding box and returns the near and far distances of the projection.

◆ GetBoundingBoxDepth() [2/2]

bool ON_Viewport::GetBoundingBoxDepth	(	ON_BoundingBox	bbox,
		double *	near_dist,
		double *	far_dist,
		bool	bGrowNearFar = `false`
	)		const

Description: Get near and far clipping distances of a bounding box. Parameters: bbox - [in] bounding box near_dist - [out] near distance of the box This value can be zero or negative when the camera location is inside bbox. far_dist - [out] far distance of the box This value can be equal to near_dist, zero or negative when the camera location is in front of the bounding box. bGrowNearFar - [in] If true and input values of near_dist and far_dist are not ON_UNSET_VALUE, the near_dist and far_dist are enlarged to include bbox. Returns: True if the bounding box intersects the view frustum and near_dist/far_dist were set. False if the bounding box does not intersect the view frustum. Remarks: This function ignores the current value of the viewport's near and far settings. If the viewport is a perspective projection, the it intersects the semi infinite frustum volume with the bounding box and returns the near and far distances of the intersection. If the viewport is a parallel projection, it intersects the infinite view region with the bounding box and returns the near and far distances of the projection.

◆ GetBoundingBoxProjectionExtents()

bool ON_Viewport::GetBoundingBoxProjectionExtents	(	ON_BoundingBox	bbox,
		ON_Interval &	x_extents,
		ON_Interval &	y_extents
	)		const

Description: Get the normalized extents of the smallest rectangle that contains the intersection of bbox and the view's frustum. Parameters: bbox - [in] bounding box x_extents - [out] y_extents - [out] 0 <= x_extents[0] <= x_extents[1] <= 1.0 0 <= y_extents[0] <= y_extents[1] <= 1.0 If true is returned, then intersection of the bbox and the view's frustum is not empty and the bounding rectangle of the projection of the intersection set is returned in x_range and y_range. The returned values are normalized image extents. For example, if x_extents[0] = 0.0, x_extents[1] = 0.25, y_extents[0] = 0.75 and y_extents[1] = 1.0, then the portion of bbox in the view's frustum would project to the upper left corner of the image. Returns: True if the bounding box intersects the view frustum and x_range and y_range were set. False if the bounding box does not intersect the view frustum. Remarks: This function takes the viewport's near and far settings into account. Set them to something appropriate before calling this function.

◆ GetCamera35mmLenseLength()

bool ON_Viewport::GetCamera35mmLenseLength ( double * lens_length ) const

Same as GetCamera35mmLensLength() with "lens" misspelled.

◆ GetCamera35mmLensLength()

bool ON_Viewport::GetCamera35mmLensLength ( double * lens_length ) const

These functions assume the camera is horizontal and crop the film rather than the image when the aspect of the frustum is not 36/24. (35mm film is 36mm wide and 24mm high.)

The SetCamera35mmLensLength() preserves camera location, changes the frustum, but maintains the frustum's aspect.

◆ GetCameraAngle() [1/2]

bool ON_Viewport::GetCameraAngle	(	double *	half_diagonal_angle,
		double *	half_vertical_angle,
		double *	half_horizontal_angle
	)		const

Parameters

half_diagonal_angle	1/2 of diagonal subtended angle
half_vertical_angle	1/2 of vertical subtended angle
half_horizontal_angle	1/2 of horizontal subtended angle

◆ GetCameraAngle() [2/2]

bool ON_Viewport::GetCameraAngle ( double * half_smallest_angle ) const

Parameters

half_smallest_angle 1/2 of smallest subtended view angle

◆ GetCameraExtents() [1/3]

bool ON_Viewport::GetCameraExtents	(	const ON_BoundingBox &	,
		ON_BoundingBox &	cambbox,
		int	bGrowBox = `false`
	)		const

Parameters

cambbox	bounding box in camera coordinates
bGrowBox	set to true if you want to enlarge an existing camera coordinate box

◆ GetCameraExtents() [2/3]

bool ON_Viewport::GetCameraExtents	(	int	,
		int	,
		const double *	,
		ON_BoundingBox &	cambbox,
		int	bGrowBox = `false`
	)		const

Parameters

cambbox	bounding box in camera coordinates
bGrowBox	set to true if you want to enlarge an existing camera coordinate box

◆ GetCameraExtents() [3/3]

bool ON_Viewport::GetCameraExtents	(	ON_3dPoint &	,
		double	,
		ON_BoundingBox &	cambox,
		int	bGrowBox = `false`
	)		const

Parameters

cambox	bounding box in camera coordinates
bGrowBox	set to true if you want to enlarge an existing camera coordinate box

◆ GetCameraFrame() [1/2]

bool ON_Viewport::GetCameraFrame ( class ON_Plane & camera_frame ) const

◆ GetCameraFrame() [2/2]

bool ON_Viewport::GetCameraFrame	(	double *	,
		double *	,
		double *	,
		double *
	)		const

returns true if current camera orientation is valid

◆ GetClipCoordDepthBiasXform()

bool ON_Viewport::GetClipCoordDepthBiasXform	(	double	relative_depth_bias,
		ON_Xform &	clip_bias
	)		const

Description: Calculate a transformation to apply to clipping coordinates to bias their depth.

Parameters: relative_depth_bias - [in] signed relative bias. = 0: no bias, > 0: bias towards frustum's near clipping plane < 0: bias towards frustum's far clipping plane When you have curves and points that are "on" shaded objects, values around 1/512 work well to move the wire objects in front of or behind shaded objects.

clip_bias - [out] clip_bias = cam2clip * delta * clip2cam, where delta = 1 0 0 0 0 1 0 0 0 0 1 D 0 0 0 1 and D = relative_depth_bias*(far-near).

Returns: True if the function worked. False if the frustum settings are not valid, in which cate the identity matrix is returned.

Remarks: The inverse of the transformations returned by GetClipCoordDepthBiasXform(+r,...) is the transformation returned by GetClipCoordDepthBiasXform(-r,...).

◆ GetCoordinateSprite()

bool ON_Viewport::GetCoordinateSprite	(	int	,
		int	,
		int	,
		int	[3],
		double	[3][2]
	)		const

◆ GetDollyCameraVector()

bool ON_Viewport::GetDollyCameraVector	(	int	screen_x0,
		int	screen_y0,
		int	screen_x1,
		int	screen_y1,
		double	proj_plane_dist,
		ON_3dVector &	dolly_vector
	)		const

Gets a world coordinate dolly vector that can be passed to DollyCamera().

Parameters

screen_y0	(x,y) screen coords of start point
screen_y1	(x,y) screen coords of end point
proj_plane_dist	distance of projection plane from camera.
dolly_vector	When in doubt, use 0.5*(frus_near+frus_far). world coordinate dolly vector returned here

◆ GetFarPlane()

bool ON_Viewport::GetFarPlane ( ON_Plane & far_plane ) const

Description: Get far clipping plane.

far_plane - [out] far clipping plane if camera and frustum are valid. The plane's frame is the same as the camera's frame. The origin is located at the intersection of the camera direction ray and the far clipping plane. The plane's normal points into the frustum towards the camera location.

Returns: true if camera and frustum are valid.

◆ GetFarPlaneEquation()

bool ON_Viewport::GetFarPlaneEquation ( ON_PlaneEquation & far_plane_equation ) const

◆ GetFarRect()

bool ON_Viewport::GetFarRect	(	ON_3dPoint &	left_bottom,
		ON_3dPoint &	right_bottom,
		ON_3dPoint &	left_top,
		ON_3dPoint &	right_top
	)		const

Description: Get corners of far clipping plane rectangle.

Parameters: left_bottom - [out] right_bottom - [out] left_top - [out] right_top - [out]

Returns: true if camera and frustum are valid.

◆ GetFrustum()

bool ON_Viewport::GetFrustum	(	double *	left,
		double *	right,
		double *	bottom,
		double *	top,
		double *	near_dist = `nullptr`,
		double *	far_dist = `nullptr`
	)		const

Parameters

right	(left < right)
top	(bottom < top)
far_dist	(0 < near_dist < far_dist)

◆ GetFrustumAspect()

bool ON_Viewport::GetFrustumAspect ( double & ) const

Returns frustum's width/height.

◆ GetFrustumBottomPlane()

bool ON_Viewport::GetFrustumBottomPlane ( ON_Plane & bottom_plane ) const

Description: Get bottom world frustum clipping plane. Parameters: bottom_plane - [out] frustum bottom side clipping plane. The normal points into the visible region of the frustum. If the projection is perspective, the origin is at the camera location, otherwise the origin is the point on the plane that is closest to the camera location. Returns: True if camera and frustum are valid and plane was set.

◆ GetFrustumBottomPlaneEquation()

bool ON_Viewport::GetFrustumBottomPlaneEquation ( ON_PlaneEquation & bottom_plane_equation ) const

◆ GetFrustumCenter()

bool ON_Viewport::GetFrustumCenter ( double * ) const

Returns world coordinates of frustum's center.

◆ GetFrustumLeftPlane()

bool ON_Viewport::GetFrustumLeftPlane ( ON_Plane & left_plane ) const

Description: Get left world frustum clipping plane. Parameters: left_plane - [out] frustum left side clipping plane. The normal points into the visible region of the frustum. If the projection is perspective, the origin is at the camera location, otherwise the origin is the point on the plane that is closest to the camera location. Returns: True if camera and frustum are valid and plane was set.

◆ GetFrustumLeftPlaneEquation()

bool ON_Viewport::GetFrustumLeftPlaneEquation ( ON_PlaneEquation & left_plane_equation ) const

◆ GetFrustumLine()

bool ON_Viewport::GetFrustumLine	(	double	screenx,
		double	screeny,
		ON_Line &	world_line
	)		const

Description: Get the world coordinate line in the view frustum that projects to a point on the screen. Parameters: screenx - [in] screeny - [in] (screenx,screeny) = screen location world_line - [out] 3d world coordinate line segment starting on the near clipping plane and ending on the far clipping plane. Returns: true if successful. false if view projection or frustum is invalid.

◆ GetFrustumRightPlane()

bool ON_Viewport::GetFrustumRightPlane ( ON_Plane & right_plane ) const

Description: Get right world frustum clipping plane. Parameters: right_plane - [out] frustum right side clipping plane. The normal points into the visible region of the frustum. If the projection is perspective, the origin is at the camera location, otherwise the origin is the point on the plane that is closest to the camera location. Returns: True if camera and frustum are valid and plane was set.

◆ GetFrustumRightPlaneEquation()

bool ON_Viewport::GetFrustumRightPlaneEquation ( ON_PlaneEquation & right_plane_equation ) const

◆ GetFrustumTopPlane()

bool ON_Viewport::GetFrustumTopPlane ( ON_Plane & top_plane ) const

Description: Get top world frustum clipping plane. Parameters: top_plane - [out] frustum top side clipping plane. The normal points into the visible region of the frustum. If the projection is perspective, the origin is at the camera location, otherwise the origin is the point on the plane that is closest to the camera location. Returns: True if camera and frustum are valid and plane was set.

◆ GetFrustumTopPlaneEquation()

bool ON_Viewport::GetFrustumTopPlaneEquation ( ON_PlaneEquation & top_plane_equation ) const

◆ GetNearPlane()

bool ON_Viewport::GetNearPlane ( ON_Plane & near_plane ) const

Description: Get near clipping plane.

near_plane - [out] near clipping plane if camera and frustum are valid. The plane's frame is the same as the camera's frame. The origin is located at the intersection of the camera direction ray and the near clipping plane. The plane's normal points out of the frustum towards the camera location.

Returns: true if camera and frustum are valid.

◆ GetNearPlaneEquation()

bool ON_Viewport::GetNearPlaneEquation ( ON_PlaneEquation & near_plane_equation ) const

◆ GetNearRect()

bool ON_Viewport::GetNearRect	(	ON_3dPoint &	left_bottom,
		ON_3dPoint &	right_bottom,
		ON_3dPoint &	left_top,
		ON_3dPoint &	right_top
	)		const

Description: Get corners of near clipping plane rectangle.

Parameters: left_bottom - [out] right_bottom - [out] left_top - [out] right_top - [out]

Returns: true if camera and frustum are valid.

◆ GetPerspectiveClippingPlaneConstraints()

static void ON_Viewport::GetPerspectiveClippingPlaneConstraints	(	ON_3dPoint	camera_location,
		unsigned int	depth_buffer_bit_depth,
		double *	min_near_dist,
		double *	min_near_over_far
	)

static

Description:
Get suggested values for setting the perspective minimum near distance and minimum near/far ratio. Parameters:
camera_location - [in] depth_buffer_bit_depth - [in] typically 32, 24, 16 or 8, but any positive value can be passed in. min_near_dist - [out] Suggest value for passing to SetPerspectiveMinNearDist().
min_near_over_far - [out] Suggest value for passing to SetPerspectiveMinNearOverFar().

◆ GetPointDepth() [1/2]

bool ON_Viewport::GetPointDepth	(	ON_3dPoint	point,
		double *	near_dist,
		double *	far_dist,
		bool	bGrowNearFar = `false`
	)		const

Description: Get near and far clipping distances of a point Parameters: point - [in] near_dist - [out] near distance of the point (can be < 0) far_dist - [out] far distance of the point (can be equal to near_dist) bGrowNearFar - [in] If true and input values of near_dist and far_dist are not ON_UNSET_VALUE, the near_dist and far_dist are enlarged to include bbox. Returns: True if the point is ing the view frustum and near_dist/far_dist were set. False if the bounding box does not intersect the view frustum.

◆ GetPointDepth() [2/2]

bool ON_Viewport::GetPointDepth	(	ON_3dPoint	point,
		double *	view_plane_depth
	)		const

Description: Get the view plane depth of a point Parameters: point - [in] view_plane_depth - [out] positive values are in front of the camera and negative values are behind the camera. If 0 <= point_depth < FrustumNear(), the point's view plane is between the camera and the frustum's near plane. If point_depth > FrustumFar(), the point's view plane is farther from the camera and the frustum's far plane. Returns: True if the point is ing the view frustum and near_dist/far_dist were set. False if the bounding box does not intersect the view frustum.

◆ GetScreenPort()

bool ON_Viewport::GetScreenPort	(	int *	left,
		int *	right,
		int *	port_bottom,
		int *	port_top,
		int *	port_near = `nullptr`,
		int *	port_far = `nullptr`
	)		const

Parameters

right	( port_left != port_right )
port_top	( port_bottom != port_top)

◆ GetScreenPortAspect()

bool ON_Viewport::GetScreenPortAspect ( double & ) const

port's |width/height|

◆ GetSphereDepth()

bool ON_Viewport::GetSphereDepth	(	ON_Sphere	sphere,
		double *	near_dist,
		double *	far_dist,
		bool	bGrowNearFar = `false`
	)		const

Description: Get near and far clipping distances of a bounding sphere. Parameters: sphere - [in] bounding sphere near_dist - [out] near distance of the sphere (can be < 0) far_dist - [out] far distance of the sphere (can be equal to near_dist) bGrowNearFar - [in] If true and input values of near_dist and far_dist are not ON_UNSET_VALUE, the near_dist and far_dist are enlarged to include bbox. Returns: True if the sphere intersects the view frustum and near_dist/far_dist were set. False if the sphere does not intersect the view frustum.

◆ GetViewPlane()

bool ON_Viewport::GetViewPlane	(	double	view_plane_depth,
		ON_Plane &	view_plane
	)		const

Description: Get the plane that is a specified distance from the camera. This plane is parallel to the frustum's near and far planes. Parameters: view_plane_depth - [in] The distance from the camera location to the view plane. Positive distances are in front of the camera and negative distances are behind the camera. A value of FrustumNear() will return the frustum's near plane and a valid of FrustumFar() will return the frustum's far plane. view_plane - [out] View plane view_plane_equation - [out] Equation of the view plane. Returns: True if the camera and frustum are valid and view_plane was calculated. False otherwise.

◆ GetViewPlaneEquation()

bool ON_Viewport::GetViewPlaneEquation	(	double	view_plane_depth,
		ON_PlaneEquation &	view_plane_equation
	)		const

◆ GetViewPlaneRect()

bool ON_Viewport::GetViewPlaneRect	(	double	view_plane_depth,
		ON_3dPoint &	left_bottom,
		ON_3dPoint &	right_bottom,
		ON_3dPoint &	left_top,
		ON_3dPoint &	right_top
	)		const

Description: Get the world coordinate corners of the rectangle of a view plane that is a specified distance from the camera. This rectangle is parallel to the frustum's near and far planes. Parameters: view_plane_depth - [in] The distance from the camera location to the view plane. Positive distances are in front of the camera and negative distances are behind the camera. A value of FrustumNear() will return the frustum's near rectangle and a value of FrustumFar() will return the frustum's far rectangle. left_bottom - [out] right_bottom - [out] left_top - [out] right_top - [out] Returns: True if the camera and frustum are valid and view_plane was calculated. False otherwise.

◆ GetViewScale() [1/2]

void ON_Viewport::GetViewScale	(	double *	x,
		double *	y
	)		const

◆ GetViewScale() [2/2]

void ON_Viewport::GetViewScale	(	double *	x,
		double *	y,
		double *	z
	)		const

◆ GetWorldToScreenScale() [1/2]

bool ON_Viewport::GetWorldToScreenScale	(	double	frustum_depth,
		double *	pixels_per_unit
	)		const

Description: Get the number of horizontal pixels per world unit at the location in screen space where world_point would be rendered. Parameters: frustum_depth - [in] (ignored for parallel projection viewports) If the viewport has a perspective projection, then this parameter specifies the depth in the view frustum where the scale is calculated. If frustum_depth is not > 0.0, then FrustumNear() is used. pixels_per_unit - [out] number of horizontal screen pixels per world unit at the location in screen space where frustum_depth would be rendered. If the viewport is not valid, then 0.0 is returned. Returns: true: success. false: The view projection or frustum is invalid.

◆ GetWorldToScreenScale() [2/2]

bool ON_Viewport::GetWorldToScreenScale	(	ON_3dPoint	world_point,
		double *	pixels_per_unit
	)		const

display tools

Description: Get the number of horizontal pixels per world unit at the location in screen space where world_point would be rendered. Parameters: world_point - [in] (ignored for parallel projection viewports) world location frustum_depth - [in] (ignored for parallel projection viewports) If the viewport has a perspective projection, then this parameter specifies the depth in the view frustum where the scale is calculated. If frustum_depth is not > 0.0, then FrustumNear() is used. pixels_per_unit - [out] number of horizontal screen pixels per world unit at the location in screen space where world_point would be rendered. If the viewport is not valid, then 0.0 is returned. Returns: true: success. false: The view projection or frustum is invalid.

◆ GetXform()

bool ON_Viewport::GetXform	(	ON::coordinate_system	srcCS,
		ON::coordinate_system	destCS,
		ON_Xform &	matrix
	)		const

Parameters

matrix 4x4 transformation matrix (acts on the left)

◆ Initialize()

void ON_Viewport::Initialize ( )

Interface /////////////////////////////////////////////////////////////////

Deprecated:: Use = ON_Viewport::DefaultTopViewYUp

◆ InViewFrustum() [1/6]

int ON_Viewport::InViewFrustum	(	bool	bInfiniteFrustum,
		const ON_BoundingBox &	bbox,
		const ON_Xform *	bbox_xform
	)		const

Description: Determine if some portion of the transformed bounding box is inside the view frustum. Parameters: bInfiniteFrustum - [in] ignore the near and far clipping planes of the viewport. bbox - [in] bounding box bbox_xform - [in] If not nullptr, this transformation is applied to the bounding box. Typically bbox_xform is used to pass an instance reference transformation. Returns: 0 = No part of the of the transformed bounding box is in the view frustum or the view camera and frustum have not been set. 1 = A portion of of the transformed bounding box is in the view frustum 2 = The entire transformed bounding box is in the view frustum.

◆ InViewFrustum() [2/6]

int ON_Viewport::InViewFrustum ( const ON_BoundingBox & bbox ) const

◆ InViewFrustum() [3/6]

int ON_Viewport::InViewFrustum	(	int	count,
		const ON_3dPoint *	p
	)		const

◆ InViewFrustum() [4/6]

int ON_Viewport::InViewFrustum	(	int	count,
		const ON_3fPoint *	p
	)		const

◆ InViewFrustum() [5/6]

int ON_Viewport::InViewFrustum	(	int	count,
		const ON_4dPoint *	p
	)		const

◆ InViewFrustum() [6/6]

int ON_Viewport::InViewFrustum ( ON_3dPoint P ) const

Description: The "view frustum" is the frustum the m_xform transformation maps to clipping coordinate box (-1,+1)^3. These functions determine if some portion of the convex hull of the test points is inside the view frustum. Parameters: P - [in] point box - [in] bounding box count - [in] number of points p - [in] array of points bEnableClippingPlanes - [in] If true, then the additional clipping planes are tested. If false, then the additional clipping planes are ignored. Returns: 0 = No part of the of the convex hull of the tested points is in the view frustum or the view camera and frustum have not been set. 1 = A portion of the convex hull of the otested points may be in the view frustum. 2 = The entire convex hull of the tested points is in the view frustum.

Remarks: Each call to ON_Viewport::InViewFrustum() requires the calculation of the world-to-clipping coordinates transformation. If multiple queries are required, fewer computation resources will be used if you set ON_ClippingRegion.m_xform to the viewport's world-to- clipping coordinate transformation and then call the ON_ClippingRegion::InViewFrustum() functions.

◆ IsCameraFrameWorldPlan()

bool ON_Viewport::IsCameraFrameWorldPlan	(	int *	,
		int *	,
		int *
	)

◆ IsParallelProjection()

bool ON_Viewport::IsParallelProjection ( ) const

Returns: True if the projection is ON::parallel_view.

◆ IsPerspectiveProjection()

bool ON_Viewport::IsPerspectiveProjection ( ) const

Returns: True if the projection is ON::perspective_view.

◆ IsTwoPointPerspectiveProjection()

bool ON_Viewport::IsTwoPointPerspectiveProjection ( ) const

Returns IsPerspectiveProjection() && CameraUpIsLocked() && FrustumIsLeftRightSymmetric && !FrustumIsTopBottomSymmetric

◆ IsValid()

bool ON_Viewport::IsValid ( class ON_TextLog * text_log = nullptr ) const

overridevirtual

ON_Object overrides //////////////////////////////////////////////////////

Reimplemented from ON_Geometry.

◆ IsValidCamera()

bool ON_Viewport::IsValidCamera ( ) const

Returns: True if camera location is valid and camera up, direction, X, Y, and Z are valid.

◆ IsValidCameraFrame()

bool ON_Viewport::IsValidCameraFrame ( ) const

Returns: True if camera up, direction, X, Y, and Z are valid.

◆ IsValidCameraLocation()

static bool ON_Viewport::IsValidCameraLocation ( ON_3dPoint candidate_point )

static

Returns: candidate_point.IsValid() && candidate_point.MaximumCoordinate() < ON_NONSENSE_WORLD_COORDINATE_VALUE;

◆ IsValidCameraUpOrDirection()

static bool ON_Viewport::IsValidCameraUpOrDirection ( ON_3dVector candidate_vector )

static

Returns: candidate_vector.IsValid() && candidate_vector.MaximumCoordinate() < ON_NONSENSE_WORLD_COORDINATE_VALUE && candidate_vector.MaximumCoordinate() > ON_ZERO_TOLERANCE ;

◆ IsValidFrustum()

bool ON_Viewport::IsValidFrustum ( ) const

Returns: True if camera frustum is valid.

◆ operator=()

ON_Viewport& ON_Viewport::operator= ( const ON_Viewport & )

default

◆ PerspectiveMinNearDist()

double ON_Viewport::PerspectiveMinNearDist ( ) const

Description: Expert user function to get the minimum value of near when perspective projections are begin used. Returns: The minimum permitted value of near when perspective projections are begin used. Remarks: This is a runtime setting and is not saved in 3dm files.

◆ PerspectiveMinNearOverFar()

double ON_Viewport::PerspectiveMinNearOverFar ( ) const

Description: Expert user function to get the minimum runtime value of near/far when perspective projections are begin used. Returns: The minimum permitted value of near/far when perspective projections are begin used. Remarks: This is a runtime setting and is not saved in 3dm files.

◆ Projection()

ON::view_projection ON_Viewport::Projection ( ) const

◆ Read()

bool ON_Viewport::Read ( ON_BinaryArchive & )

overridevirtual

Description: Reads ON_Viewport definition from a binary archive.

Parameters: binary_archive - [in] open binary archive

Returns: true if successful.

Remarks: This overrides the virtual ON_Object::Read() function.

Reimplemented from ON_Object.

◆ ScreenPortHeight()

int ON_Viewport::ScreenPortHeight ( ) const

Returns: std::abs(port_bottom - port_top)

◆ ScreenPortSize()

ON_2iSize ON_Viewport::ScreenPortSize ( ) const

◆ ScreenPortWidth()

int ON_Viewport::ScreenPortWidth ( ) const

Returns: std::abs(port_right - port_left)

◆ SetCamera()

bool ON_Viewport::SetCamera	(	const ON_Viewport &	source_viewport,
		bool	bBreakLocks
	)

Description: Copy camera location, up, direction and frame from source_viewport. Parameters: source_viewport - [in] camera location to copy bBreakLocks - [in] If true, any locked frustum settings will be unlocked.

◆ SetCamera35mmLenseLength()

bool ON_Viewport::SetCamera35mmLenseLength ( double lens_length )

Same as SetCamera35mmLensLength() with "lens" misspelled.

◆ SetCamera35mmLensLength()

bool ON_Viewport::SetCamera35mmLensLength ( double lens_length )

◆ SetCameraAngle()

bool ON_Viewport::SetCameraAngle ( double half_smallest_angle )

Parameters

half_smallest_angle 1/2 of smallest subtended view angle 0 < angle < pi/2

◆ SetCameraDirection()

bool ON_Viewport::SetCameraDirection ( const ON_3dVector & )

◆ SetCameraDirectionLock()

void ON_Viewport::SetCameraDirectionLock ( bool bLockCameraDirection )

◆ SetCameraLocation()

bool ON_Viewport::SetCameraLocation ( const ON_3dPoint & )

These return true if the current direction and up are not zero and not parallel so the camera position is well defined.

◆ SetCameraLocationLock()

void ON_Viewport::SetCameraLocationLock ( bool bLockCameraLocation )

◆ SetCameraUp()

bool ON_Viewport::SetCameraUp ( const ON_3dVector & )

◆ SetCameraUpLock()

void ON_Viewport::SetCameraUpLock ( bool bLockCameraUp )

◆ SetFrustum() [1/2]

bool ON_Viewport::SetFrustum	(	const ON_Viewport &	source_viewport,
		bool	bBreakLocks
	)

Description: Copy frustum information from source_viewport. Parameters: source_viewport - [in] bBreakLocks - [in] If true, any locked frustum settings will be unlocked.

◆ SetFrustum() [2/2]

bool ON_Viewport::SetFrustum	(	double	left,
		double	right,
		double	bottom,
		double	top,
		double	near_dist,
		double	far_dist
	)

Description: Set the view frustum. If FrustumSymmetryIsLocked() is true and left != -right or bottom != -top, then they will be adjusted so the resulting frustum is symmetric.

Parameters

right	( left < right )
top	( bottom < top )
far_dist	( 0 < near_dist < far_dist ) ///< ignored by Rhino version 1.0

◆ SetFrustumAspect()

bool ON_Viewport::SetFrustumAspect ( double )

SetFrustumAspect() changes the larger of the frustum's width/height so that the resulting value of width/height matches the requested aspect. The camera angle is not changed. If you change the shape of the view port with a call SetScreenPort(), then you generally want to call SetFrustumAspect() with the value returned by GetScreenPortAspect().

◆ SetFrustumLeftRightSymmetry()

void ON_Viewport::SetFrustumLeftRightSymmetry ( bool bForceLeftRightSymmetry )

◆ SetFrustumNearFar() [1/5]

bool ON_Viewport::SetFrustumNearFar	(	const double *	bboxmin,
		const double *	bboxmax
	)

Parameters

bboxmin	3d bounding box min
bboxmax	3d bounding box max

◆ SetFrustumNearFar() [2/5]

bool ON_Viewport::SetFrustumNearFar	(	const double *	center,
		double	radius
	)

Parameters

center	3d bounding sphere center
radius	3d bounding sphere radius

◆ SetFrustumNearFar() [3/5]

bool ON_Viewport::SetFrustumNearFar	(	double	near_dist,
		double	far_dist
	)

Parameters

near_dist ( > 0 )

◆ SetFrustumNearFar() [4/5]

bool ON_Viewport::SetFrustumNearFar	(	double	near_dist,
		double	far_dist,
		double	min_near_dist,
		double	min_near_over_far,
		double	target_dist
	)

Description: Set near and far clipping distance subject to constraints. Parameters: near_dist - [in] (>0) desired near clipping distance far_dist - [in] (>near_dist) desired near clipping distance min_near_dist - [in] If min_near_dist <= 0.0, it is ignored. If min_near_dist > 0 and near_dist < min_near_dist, then the frustum's near_dist will be increased to min_near_dist. min_near_over_far - [in] If min_near_over_far <= 0.0, it is ignored. If near_dist < far_dist*min_near_over_far, then near_dist is increased and/or far_dist is decreased so that near_dist = far_dist*min_near_over_far. If near_dist < target_dist < far_dist, then near_dist near_dist is increased and far_dist is decreased so that projection precision will be good at target_dist. Otherwise, near_dist is simply set to far_dist*min_near_over_far. target_dist - [in]
If target_dist <= 0.0, it is ignored. If target_dist > 0, it is used as described in the description of the min_near_over_far parameter. relative_depth_bias - [in] If relative_depth_bias <= 0.0, it is ignored. If relative_depth_bias > 0, it is assumed that the requested near_dist and far_dist were calculated assuming no depth bias and the values will be appropriately adjusted to ensure the frustum's near and far clipping planes will not clip biased objects.

◆ SetFrustumNearFar() [5/5]

bool ON_Viewport::SetFrustumNearFar	(	double	near_dist,
		double	far_dist,
		double	min_near_dist,
		double	min_near_over_far,
		double	target_dist,
		double	relative_depth_bias
	)

◆ SetFrustumTopBottomSymmetry()

void ON_Viewport::SetFrustumTopBottomSymmetry ( bool bForceTopBottomSymmetry )

◆ SetPerspectiveClippingPlaneConstraints()

void ON_Viewport::SetPerspectiveClippingPlaneConstraints ( unsigned int depth_buffer_bit_depth )

Description: Set suggested the perspective minimum near distance and minimum near/far ratio to the suggested values returned by GetPerspectiveClippingPlaneConstraints(). Parameters: depth_buffer_bit_depth - [in] typically 32, 24, 16 or 8, but any positive value can be passed in.

◆ SetPerspectiveMinNearDist()

void ON_Viewport::SetPerspectiveMinNearDist ( double min_near_dist )

Description: Expert user function to control the minimum value of near when perspective projections are begin used. Parameters: min_near_dist - [in] Remarks: This is a runtime setting and is not saved in 3dm files.

◆ SetPerspectiveMinNearOverFar()

void ON_Viewport::SetPerspectiveMinNearOverFar ( double min_near_over_far )

Description: Expert user function to control the minimum ratio of near/far when perspective projections are begin used. Parameters: min_near_over_far - [in] Remarks: This is a runtime setting and is not saved in 3dm files.

◆ SetProjection()

bool ON_Viewport::SetProjection ( ON::view_projection projection )

Description: Unconditionally set the projection. Parameters: projection - [in] See Also: ON_Viewport::SetParallelProjection ON_Viewport::SetPerspectiveProjection ON_Viewport::SetTwoPointPerspectiveProjection

◆ SetScreenPort()

bool ON_Viewport::SetScreenPort	(	int	port_left,
		int	port_right,
		int	port_bottom,
		int	port_top,
		int	port_near = `0`,
		int	port_far = `0`
	)

Description: Location of viewport in pixels. These are provided so you can set the port you are using and get the appropriate transformations to and from screen space. Parameters: port_left - [in] port_right - [in] (port_left != port_right) port_bottom - [in] port_top - [in] (port_top != port_bottom) port_near - [in] port_far - [in] Example:

/ For a Windows window int width = width of window client area in pixels; int height = height of window client area in pixels; port_left = 0; port_right = width; port_top = 0; port_bottom = height; port_near = 0; port_far = 1; SetScreenPort( port_left, port_right, port_bottom, port_top, port_near, port_far );

Returns: true if input is valid. See Also: ON_Viewport::GetScreenPort

◆ SetTargetPoint()

bool ON_Viewport::SetTargetPoint ( ON_3dPoint target_point )

Description: Set the target point. Parameters: target_point - [in] When in doubt, the point returned by FrustumCenterPoint(ON_UNSET_VALUE) is a good choice. Remarks: The default constructor sets this point on ON_3dPoint::UnsetPoint. You must explicitly call one SetTargetPoint() functions to set the target point.

◆ SetViewportId()

bool ON_Viewport::SetViewportId ( const ON_UUID & viewport_id )

Description: Sets the viewport's id to the value used to uniquely identify this viewport. Parameters: viewport_id - [in]
Returns: True if the viewport's id was successfully set and false otherwise (ie. the viewport uuid has already been set). Remarks: There is no approved way to change the viewport id once it is set in order to maintain consistency across multiple viewports and those routines that manage them.

◆ SetViewScale() [1/2]

bool ON_Viewport::SetViewScale	(	double	x,
		double	y
	)

Description: Apply scaling factors to parallel projection clipping coordinates by setting the m_clip_mod transformation.
Parameters: x - [in] x > 0 y - [in] y > 0 Example: If you want to compress the view projection across the viewing plane, then set x = 0.5, y = 1.0, and z = 1.0. Returns: True if successful. False if input is invalid or the view is a perspective view.

◆ SetViewScale() [2/2]

bool ON_Viewport::SetViewScale	(	double	x,
		double	y,
		double	z
	)

◆ ShallowCopy()

ON_Viewport* ON_Viewport::ShallowCopy ( ON_Viewport * destination ) const

Description: Creates a shallow copy of this (no base class member including user data are copied). Parameters: destination - [in] If destination is not nullptr, then the copy is put in this class. Otherwise, the copy is put into a viewport created by calling new ON_Viewport().

◆ TargetDistance()

double ON_Viewport::TargetDistance ( bool bUseFrustumCenterFallback ) const

Description: Get the distance from the target point to the camera plane. Note that if the frustum is not symmetric, then this distance is shorter than the distance from the target to the camera location. Parameters: bUseFrustumCenterFallback - [in] If bUseFrustumCenterFallback is false and the target point is not valid, then ON_UNSET_VALUE is returned. If bUseFrustumCenterFallback is true and the frustum is valid and current target point is not valid or is behind the camera, then 0.5*(near + far) is returned. Returns: Shortest signed distance from camera plane to target point. If the target point is on the visible side of the camera, a positive value is returned. ON_UNSET_VALUE is returned when the input of view is not valid.

◆ TargetPoint()

ON_3dPoint ON_Viewport::TargetPoint ( ) const

Returns: The current value of the target point. This point does not play a role in the view projection calculations. It can be used as a fixed point when changing the camera so the visible regions of the before and after frustums both contain the region of interest. Remarks: The default constructor sets this point on ON_3dPoint::UnsetPoint. You must explicitly call one SetTargetPoint() functions to set the target point.

◆ Transform()

bool ON_Viewport::Transform ( const ON_Xform & )

overridevirtual

Description: Transforms the view camera location, direction, and up.

Parameters: xform - [in] transformation to apply to camera.

Returns: @untitled table true Valid camera was transformed. false Invalid camera, frustum, or transformation.

Remarks: This overrides the virtual ON_Geometry::Transform() function.

Reimplemented from ON_Geometry.

◆ UnlockCamera()

void ON_Viewport::UnlockCamera ( )

sets all camera locks to false

◆ UnlockFrustumSymmetry()

void ON_Viewport::UnlockFrustumSymmetry ( )

sets all frustum symmetry locks to false

◆ ViewportId()

ON_UUID ON_Viewport::ViewportId ( void ) const

◆ ViewProjectionContentHash()

ON_SHA1_Hash ON_Viewport::ViewProjectionContentHash ( ) const

Returns: A sha1 hash of all the settings that effect view projection matrices. view projection, camera location, camera X,Y,Z frame, frustum, port.
If two ON_Viewport classes have identical values ViewProjectionContentHash(), then they will have identical view projection matrices and generate identical images from the same model content.

◆ Write()

bool ON_Viewport::Write ( ON_BinaryArchive & ) const

overridevirtual

Description: Writes ON_Viewport definition from a binary archive.

Parameters: binary_archive - [in] open binary archive

Returns: true if successful.

Remarks: This overrides the virtual ON_Object::Write() function.

Reimplemented from ON_Object.

◆ ZoomToScreenRect()

bool ON_Viewport::ZoomToScreenRect	(	int	screen_x0,
		int	screen_y0,
		int	screen_x1,
		int	screen_y1
	)

ZoomToScreenRect() may change camera and frustum settings.

View changing from screen input points. Handy for using a mouse to manipulate a view.

Parameters

screen_y0	(x,y) screen coords of a rectangle corner
screen_y1	(x,y) screen coords of opposite rectangle corner

Member Data Documentation

◆ Default3dCameraDirection

const ON_3dVector ON_Viewport::Default3dCameraDirection

static

(-0.43301270189221932338186158537647,0.75,-0.5)

◆ DefaultCameraLocation

const ON_3dPoint ON_Viewport::DefaultCameraLocation

static

(0.0,0.0,100.0)

◆ DefaultFarDist

const double ON_Viewport::DefaultFarDist

static

1000.0

◆ DefaultMinNearDist

const double ON_Viewport::DefaultMinNearDist

static

0.0001

◆ DefaultMinNearOverFar

const double ON_Viewport::DefaultMinNearOverFar

static

0.0001

◆ DefaultNearDist

const double ON_Viewport::DefaultNearDist

static

0.005

◆ DefaultPerspectiveViewZUp

const ON_Viewport ON_Viewport::DefaultPerspectiveViewZUp

static

Description: A Z-up perspective projection looking down on the origin of the XY plane. up = ON_3dVector::Zaxis, dir = ON_3dVector:Default3dCameraDirection

◆ DefaultTopViewYUp

const ON_Viewport ON_Viewport::DefaultTopViewYUp

static

Description: A Y-up parallel projection looking at the origin of the XYplane. up = ON_3dVector::Yaxis, dir = -ON_3dVector::Zaxis

◆ m_bLockCamDir

bool ON_Viewport::m_bLockCamDir = false

protected

◆ m_bLockCamLoc

bool ON_Viewport::m_bLockCamLoc = false

protected

◆ m_bLockCamUp

bool ON_Viewport::m_bLockCamUp = false

protected

Camera location, direction and orientation (in world coordinates). These values are used to set the camera frame vectors CamX, CamY, CamZ. If bValidCamera is true, then the CamX, CamY and CamZ vectors are properly initialized and should be used instead of CamDir[] and CamUp[]. The frame vectors CamX, CamY, CamZ are always a right handed orthonormal frame. The CamDir and CamUp vectors contain the values passed to SetViewCamera(). If true and the camera is valid, then the corresponding camera parameter will not be changed by view editing functions. This permits user interface to easily preserve important camera features without having to perform excessive calculations.

◆ m_bValidCamera

bool ON_Viewport::m_bValidCamera = true

protected

These boolean status flags are set to true when the associated fields contain valid values.

◆ m_bValidCameraFrame

bool ON_Viewport::m_bValidCameraFrame = true

protected

◆ m_bValidFrustum

bool ON_Viewport::m_bValidFrustum = true

protected

◆ m_bValidPort

bool ON_Viewport::m_bValidPort = false

protected

◆ m_CamDir

ON_3dVector ON_Viewport::m_CamDir = -ON_3dVector::ZAxis

protected

from camera towards view (nonzero and not parallel to m_CamUp)

◆ m_CamLoc

ON_3dPoint ON_Viewport::m_CamLoc = ON_Viewport::DefaultCameraLocation

protected

camera location

◆ m_CamUp

ON_3dVector ON_Viewport::m_CamUp = ON_3dVector::YAxis

protected

(nonzero and not parallel to m_CamDir)

◆ m_CamX

ON_3dVector ON_Viewport::m_CamX = ON_3dVector::XAxis

protected

The camera frame vectors are properly initialized by SetCamera()

◆ m_CamY

ON_3dVector ON_Viewport::m_CamY = ON_3dVector::YAxis

protected

◆ m_CamZ

ON_3dVector ON_Viewport::m_CamZ = ON_3dVector::ZAxis

protected

◆ m_frus_bottom

double ON_Viewport::m_frus_bottom = -20.0

protected

frus_bottom < frus_top

◆ m_frus_far

double ON_Viewport::m_frus_far = ON_Viewport::DefaultFarDist

protected

◆ m_frus_left

double ON_Viewport::m_frus_left = -20.0

protected

frus_left < frus_right

View Frustum Settings: /////////////////////////////////////// left, right are camera X coords on near clipping plane bottom, top are camera Y coords on near clipping plane near = distance from camera to near clipping plane far = distance from camera to far clipping plane

◆ m_frus_near

double ON_Viewport::m_frus_near = ON_Viewport::DefaultMinNearDist

protected

0 < frus_near < frus_far

◆ m_frus_right

double ON_Viewport::m_frus_right = 20.0

protected

◆ m_frus_top

double ON_Viewport::m_frus_top = 20.0

protected

◆ m_frustum_symmetry_flags

unsigned char ON_Viewport::m_frustum_symmetry_flags = 0

protected

0 != (flags & 1) top/bottom symmetry enforced 0 != (flags & 2) left/right symmetry enforced.

◆ m_port_bottom

int ON_Viewport::m_port_bottom = 0

protected

port_bottom != port_top

◆ m_port_far

int ON_Viewport::m_port_far = 1

protected

◆ m_port_left

int ON_Viewport::m_port_left = 0

protected

port_left != port_right

Device View Port Box Settings: ( in display device coordinates ) //// The point (left,bottom,-near), in camera coordinates, of the view frustum is mapped to pixel coordinate (port_left,port_bottom,port_near). The point (right,top,-far), in camera coordinates, of the view frustum is mapped to pixel coordinate (port_right,port_top,port_far). In many situations including Microsoft Windows coordinates, port_left = 0, port_right = viewport width-1, port_top = 0, port_bottom = viewport height-1.

◆ m_port_near

int ON_Viewport::m_port_near = 0

protected

(If you want an 8 bit z-buffer with z=255 being "in front of" z=0, then set port_near = 255 and port_far = 0.)

◆ m_port_right

int ON_Viewport::m_port_right = 1000

protected

◆ m_port_top

int ON_Viewport::m_port_top = 1000

protected

◆ m_projection

ON::view_projection ON_Viewport::m_projection = ON::parallel_view

protected

Camera Settings: ///////////////////////////////////////////////.

perspective or parallel projection

◆ m_target_point

ON_3dPoint ON_Viewport::m_target_point = ON_3dPoint::UnsetPoint

protected

The location of this point has no impact on the view projection. It is simply a suggestion for a fixed point when views are rotated or the isometric depth when perspective views are dollied. The default is ON_3dPoint::UnsetPoint.

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ON_Viewport() [1/2]

◆ ~ON_Viewport()

◆ ON_Viewport() [2/2]

Member Function Documentation

◆ CameraDirection()

◆ CameraDirectionIsLocked()

◆ CameraLocation()

◆ CameraLocationIsLocked()

◆ CameraUp()

◆ CameraUpIsLocked()

◆ CameraX()

◆ CameraY()

◆ CameraZ()

◆ ChangeToParallelProjection()

◆ ChangeToPerspectiveProjection()

◆ ChangeToSymmetricFrustum()

◆ ChangeToTwoPointPerspectiveProjection()

◆ ChangeViewportId()

◆ ClipCoordDepthBias()

◆ ClipModInverseXform()

◆ ClipModXform()

◆ ClipModXformIsIdentity()

◆ Dimension()

◆ DollyCamera()

◆ DollyFrustum()

◆ Dump()

◆ Extents() [1/2]

◆ Extents() [2/2]

◆ FrustumBottom()

◆ FrustumCenterPoint()

◆ FrustumFar()

◆ FrustumHeight()

◆ FrustumIsLeftRightSymmetric()

◆ FrustumIsTopBottomSymmetric()

◆ FrustumLeft()

◆ FrustumMaximumDiameter()

◆ FrustumMinimumDiameter()

◆ FrustumNear()

◆ FrustumRight()

◆ FrustumTop()

◆ FrustumWidth()

◆ GetBBox()

◆ GetBoundingBoxDepth() [1/2]

◆ GetBoundingBoxDepth() [2/2]

◆ GetBoundingBoxProjectionExtents()

◆ GetCamera35mmLenseLength()

◆ GetCamera35mmLensLength()

◆ GetCameraAngle() [1/2]

◆ GetCameraAngle() [2/2]

◆ GetCameraExtents() [1/3]

◆ GetCameraExtents() [2/3]

◆ GetCameraExtents() [3/3]

◆ GetCameraFrame() [1/2]

◆ GetCameraFrame() [2/2]

◆ GetClipCoordDepthBiasXform()

◆ GetCoordinateSprite()

◆ GetDollyCameraVector()

◆ GetFarPlane()

◆ GetFarPlaneEquation()

◆ GetFarRect()

◆ GetFrustum()

◆ GetFrustumAspect()

◆ GetFrustumBottomPlane()

◆ GetFrustumBottomPlaneEquation()

◆ GetFrustumCenter()

◆ GetFrustumLeftPlane()

◆ GetFrustumLeftPlaneEquation()

◆ GetFrustumLine()

◆ GetFrustumRightPlane()

◆ GetFrustumRightPlaneEquation()

◆ GetFrustumTopPlane()

◆ GetFrustumTopPlaneEquation()

◆ GetNearPlane()