ON_MappingChannel Class Reference

#include <opennurbs_mapchan.h>

Public Member Functions
	ON_MappingChannel ()
int	Compare (const ON_MappingChannel &other) const
void	Default ()
bool	Read (ON_BinaryArchive &archive)
bool	Write (ON_BinaryArchive &archive) const

Public Attributes
int	m_mapping_channel_id
ON_UUID	m_mapping_id
	Identifies an ON_TextureMapping. More...
int	m_mapping_index
ON_Xform	m_object_xform

Detailed Description

Copyright (c) 1993-2022 Robert McNeel & Associates. All rights reserved. OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert McNeel & Associates.

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_MappingChannel

Description: ON_3dmObjectAttributes uses ON_MappingChannel to record which texture mapping function to use when applying a texture with a matching mapping channel id. When an object is rendered, if the material has textures and ON_Texture::m_mapping_channel_id = ON_MappingChannel::m_mapping_channel_id, then the mapping with id m_mapping_id is used to map the texture. Otherwise, the mesh m_T[] texture coordinates are used to apply the texture.

Constructor & Destructor Documentation

ON_MappingChannel()

ON_MappingChannel::ON_MappingChannel

(

)

Member Function Documentation

Compare()

int ON_MappingChannel::Compare

(

const ON_MappingChannel &

other

)

const

Default()

void ON_MappingChannel::Default

(

)

Read()

bool ON_MappingChannel::Read

(

ON_BinaryArchive &

archive

)

Write()

bool ON_MappingChannel::Write

(

ON_BinaryArchive &

archive

)

const

Member Data Documentation

m_mapping_channel_id

int ON_MappingChannel::m_mapping_channel_id

ON_Texture's with a matching m_mapping_channel_id value use the mapping identified by m_mapping_id. This id must be > 0 and <= 2147483647 (0x7FFFFFFF)

m_mapping_id

ON_UUID ON_MappingChannel::m_mapping_id

Identifies an ON_TextureMapping.

m_mapping_index

int ON_MappingChannel::m_mapping_index

RUNTIME texture mapping table index. If -1, it needs to be set. This value is not saved int files.

m_object_xform

ON_Xform ON_MappingChannel::m_object_xform

The default value of m_object_xform is the identity. When an object that uses this mapping is transformed by "T", m_object_xform is updated using the formula m_object_xform = T*m_object_xform. If texture coordinates are lost and need to be recalculated and m_object_xform is not the identity, then m_object_xform should be passed to ON_TextureMapping::Evaluate() as the mesh_xform parameter. When validating mapping coordinates, m_object_xform itself be passed to HasMatchingTextureCoordinates() as the object_transform parameter.