Rhino.Geometry Namespace 
Examples are lines, curves, meshes and boundary representations.
Class  Description  

AngularDimension 
Represents a dimension of an entity that can be measured with an angle.
 
AnnotationBase 
Provides a common base class to all annotation geometry.
This class refers to the geometric element that is independent from the document.  
ArcCurve 
Represent arcs and circles.
ArcCurve.IsCircle returns true if the curve is a complete circle.  
AreaMassProperties 
Contains static initialization methods and allows access to the computed
metrics of area, area centroid and area moments in closed
planar curves, in meshes, in surfaces, in hatches and in boundary representations.
 
Arrowhead  Arrowhead used by annotation  
BezierCurve 
Represents a Bezier curve.
Note: as an exception, the bezier curve is not derived from Curve.  
Brep 
Boundary Representation. A surface or polysurface along with trim curve information.
 
BrepEdge 
Represents a single edge curve in a Brep object.
 
BrepFace 
Provides stronglytyped access to brep faces.
A Brep face is composed of one surface and trimming curves.  
BrepLoop 
Represent a single loop in a Brep object. A loop is composed
of a list of trim curves.
 
BrepRegion 
Represents a brep topological region that has sides.
 
BrepRegionFaceSide 
Represents a side of a BrepRegion entity.
 
BrepTrim 
Brep trim information is stored in BrepTrim classes. Brep.Trims is an
array of all the trims in the brep. A BrepTrim is derived from CurveProxy
so the trim can supply easy to use evaluation tools via the Curve virtual
member functions.
Note well that the domains and orientations of the curve m_C2[trim.m_c2i]
and the trim as a curve may not agree.
 
BrepVertex 
Brep vertex information
 
Centermark  Represents a centermark  
ClippingPlaneSurface 
Represents a planar surface that is used as clipping plane in viewports.
A clipping plane object maintains a list of viewports that it clips against.
 
Curve 
Represents a base class that is common to most RhinoCommon curve types.
A curve represents an entity that can be all visited by providing a single parameter, usually called t.  
CurveProxy 
Provides stronglytyped access to Brep edges.
 
DetailView 
Represents a view of the model placed on a page layout.
 
DevelopableSrf 
Helpers for developable surface functions
 
Dimension  Base class for dimensions  
Extrusion 
Represents an extrusion, or objects such as beams or linearly extruded elements,
that can be represented by profile curves and two miter planes at the extremes.
 
GeometryBase 
Provides a common base for most geometric classes. This class is abstract.
 
Hatch 
Represents a hatch in planar boundary loop or loops.
This is a 2d entity with a plane defining a local coordinate system.
The loops, patterns, angles, etc are all in this local coordinate system.
The Hatch object manages the plane and loop array
Fill definitions are in the HatchPattern or class derived from HatchPattern
Hatch has an index to get the pattern definition from the pattern table.
 
HiddenLineDrawing 
Represents a hidden line drawing object.
A hidden line drawing consists of curves generated from source objects.
The curves correspond to edges, and silhouettes of source objects and
intersections with cutting planes.
 
HiddenLineDrawingObject  Represents an object added to a HiddenLineDrawing  
HiddenLineDrawingObjectCurve 
Curves generated from source objects which correspond to edges, and
silhouettes of source objects and intersections with cutting planes. A
HiddenLineDrawingObjectCurve is partitioned into hidden and visible
segments called HiddenLineDrawingSegment
 
HiddenLineDrawingParameters 
Input used for computing a hidden line drawing
 
HiddenLineDrawingSegment 
The results of HiddenLineDrawing calculation are a collection of segments.
A segment is a subcurve of a HiddenLineDrawingObjectCurve.
 
InstanceDefinitionGeometry 
Represents a block definition in a File3dm. This is the same as
Rhino.DocObjects.InstanceDefinition, but not associated with a RhinoDoc.
 
InstanceReferenceGeometry 
Represents a reference to the geometry in a block definition.
 
Interpolator 
Exposes a set of standard numeric interpolation algorithms.
 
InvalidDimensionStyleIdException 
General exception that can be thrown by annotations
 
Leader  Leader geometry class  
Light 
Represents a light that shines in the modeling space.
 
LinearDimension  Represents a linear dimension  
LineCurve 
Represents a linear curve.
 
Matrix  
Mesh 
Represents a geometry type that is defined by vertices and faces.
This is often called a facevertex mesh.  
MeshDisplacementInfo 
Contains mesh displacement information.
 
MeshExtruder 
Extrudes a mesh and provides preview
 
MeshingParameters 
Represents settings used for creating a mesh representation of a brep or surface.
 
MeshNgon 
Represents a mesh ngon.
When retrieved from the Ngon property of a mesh, this contains faces that have edge valence strictly higher than 4. When retrieving Ngons from GetNgonAndFacesEnumerable, this might contain also triangles and quads.  
MeshPart 
Represents a portion of a mesh for partitioning
 
MeshPoint 
Represents a point that is found on a mesh.
 
MeshUnsafeLock 
Permits access to the underlying mesh raw data structures in an unsafe way.
 
MorphControl 
Represents a geometry that is able to control the morphing behaviour of some other geometry.
 
NurbsCurve 
Represents a Non Uniform Rational BSplines (NURBS) curve.
 
NurbsSurface 
Represents a Non Uniform Rational BSplines (NURBS) surface.
 
OrdinateDimension  Represents an ordinate dimension  
Particle 
Represents a simple particle.
This base class only defines position and display properties (size, color, bitmap id). You will most likely create a class that derives from this particle class to perform some sort of physical simulation (movement over time or frames).  
ParticleSystem  
PlaneSurface 
Represents a plane surface, with plane and two intervals.
 
Point 
Represents a geometric point.
This is fundamentally a class that derives from GeometryBase and contains a single Point3d location.  
Point3dGrid 
Represents a rectangular grid of 3D points.
 
PointCloud 
Represents a collection of coordinates with optional normal vectors and colors.
 
PointCloudItem 
Represents a single item in a pointcloud. A PointCloud item
always has a location, but it has an optional normal vector and color.
 
PolyCurve 
Represents a curve that is the result of joining several (possibly different)
types of curves.
 
Polyline 
Represents an ordered set of points connected by linear segments.
Polylines are closed if start and end points coincide.  
PolylineCurve  
RadialDimension 
Represents a dimension of a circular entity that can be measured with radius or diameter.
 
ReduceMeshParameters 
Parameters for Reduce method
 
RevSurface 
Represents a surface of revolution.
Revolutions can be incomplete (they can form arcs).  
RTree 
Represents a spatial search structure based on implementations of the
Rtree algorithm by Toni Gutman.
 
RTreeEventArgs 
Represents event data that is passed when when an item that meets certain
criteria is found and the passed RTree event is raised.
 
ShutLiningCurveInfo 
Contains shutlining curve information. This is used in WithShutLining(Boolean, Double, IEnumerableShutLiningCurveInfo).
 
Silhouette 
Information about silhouette curves that are generated from
geometry (surfaces, brep faces, meshes)
 
SpaceMorph 
Represents a spacial, Euclidean morph.
 
SumSurface 
Represents a sum surface, or an extrusion of a curve along a curved path.
 
Surface 
Represents a base class that is common to most RhinoCommon surface types.
A surface represents an entity that can be all visited by providing two independent parameters, usually called (u, v), or sometimes (s, t).  
SurfaceCurvature 
Maintains computed information for surface curvature evaluation.
 
SurfaceProxy 
Provides a base class to brep faces and other surface proxies.
 
SweepOneRail 
Utility class for generating breps by sweeping cross section curves over
a single rail curve.
 
SweepTwoRail 
Utility class for generating breps by sweeping cross section curves over
two rail curves.
 
TextDot 
Represents a text dot, or an annotation entity with text that always faces the camera and always has the same size.
This class refers to the geometric element that is independent from the document.  
TextEntity 
Represents text geometry.
This class refers to the geometric element that is independent from the document.  
Unroller 
Represents the operation of unrolling a single surface.
 
VolumeMassProperties 
Contains static initialization methods and allows access to the computed
metrics of volume, volume centroid and volume moments in
in solid meshes, in solid surfaces and in solid (closed) boundary representations.

Structure  Description  

Arc 
Represents the value of a plane, two angles and a radius in
a subcurve of a threedimensional circle.
The curve is parameterized by an angle expressed in radians. For an IsValid arc the total subtended angle AngleRadians() = Domain()(1)  Domain()(0) must satisfy 0 < AngleRadians() < 2*Pi The parameterization of the Arc is inherited from the Circle it is derived from. In particular t > center + cos(t)*radius*xaxis + sin(t)*radius*yaxis where xaxis and yaxis, (part of Circle.Plane) form an othonormal frame of the plane containing the circle.  
BoundingBox 
Represents the value of two points in a bounding box
defined by the two extreme corner points.
This box is therefore aligned to the world X, Y and Z axes.  
Box 
Represents the value of a plane and three intervals in
an orthogonal, oriented box that is not necessarily parallel to the world Y, X, Z axes.
 
Circle 
Represents a circle in 3D.
The values used are a radius and an orthonormal frame of the plane containing the circle, with origin at the center. The circle is parameterized by radians from 0 to 2 Pi given by t > center + cos(t)*radius*xaxis + sin(t)*radius*yaxis where center, xaxis and yaxis define the orthonormal frame of the circle plane.  
ComponentIndex 
Represents an index of an element contained in another object.
 
ComponentStatus 
Provides information about selection, highlighting, visibility, editability and integrity states of a component.
This structure is immutable.  
Cone 
Represents the center plane, radius and height values in a right circular cone.
 
ControlPoint 
Represents control point geometry with threedimensional position and weight.
 
Cylinder 
Represents the values of a plane, a radius and two heights on top and beneath
that define a right circular cylinder.
 
Ellipse 
Represents the values of a plane and the two semiaxes radii in an ellipse.
 
Interval 
Represents an interval in onedimensional space,
that is defined as two extrema or bounds.
 
Line 
Represents the value of start and end points in a single line segment.
 
MeshFace 
Represents the values of the four indices of a mesh face quad.
If the third and fourth values are the same, this face represents a triangle.  
MeshThicknessMeasurement 
Thickness measurement used in the mesh thickness solver.
 
Plane 
Represents the value of a center point and two axes in a plane in three dimensions.
 
Point2d 
Represents the two coordinates of a point in twodimensional space,
using Doubleprecision floating point numbers.
 
Point2f 
Represents the two coordinates of a point in twodimensional space,
using Singleprecision floating point numbers.
 
Point3d 
Represents the three coordinates of a point in threedimensional space,
using Doubleprecision floating point values.
 
Point3f 
Represents the three coordinates of a point in threedimensional space,
using Singleprecision floating point numbers.
 
Point4d 
Represents the four coordinates of a point in fourdimensional space.
The W (fourth) dimension is often considered the weight of the point as seen in 3D space.  
Quaternion 
Represents the four coefficient values in a quaternion.
The first value a is the real part, while the rest multipies i, j and k, that are imaginary. quaternion = a + bi + cj + dk  
Ray3d 
Represents an immutable ray in three dimensions, using position and direction.
 
Rectangle3d 
Represents the values of a plane and two intervals
that form an oriented rectangle in three dimensions.
 
Sphere 
Represents the plane and radius values of a sphere.
 
Torus 
Represents the value of a plane and two radii in a torus that is oriented in threedimensional space.
 
Transform 
Represents the values in a 4x4 transform matrix.
This is parallel to C++ ON_Xform.  
Vector2d 
Represents the two components of a vector in twodimensional space,
using Doubleprecision floating point numbers.
 
Vector2f 
Represents the two components of a vector in twodimensional space,
using Singleprecision floating point numbers.
 
Vector3d 
Represents the three components of a vector in threedimensional space,
using Doubleprecision floating point numbers.
 
Vector3f 
Represents the three components of a vector in threedimensional space,
using Singleprecision floating point numbers.

Enumeration  Description  

AnnotationType 
ON::AnnotationType identifies the type of an annotation object derived from ON_Annotation.
 
BlendContinuity 
Used in curve and surface blending functions
 
BlendType 
Blend types used for creating filleted Brep edges
 
BrepFaceShrinkDisableSide 
Defines bitwise mask flags indicating what side of a surface to not shrink.
 
BrepLoopType 
Each brep loop has a defined type, e.g. outer, inner or point on surface.
 
BrepSolidOrientation 
Enumerates all possible Solid Orientations for a Brep.
 
BrepTrimType 
Each brep trim has a defined type.
 
ComponentIndexType 
Defines enumerated values to represent component index types.
 
Concavity 
Enumerates the possible types of edge concavity types.
 
ConicSectionType 
Defines enumerated values for types of conic sections.
 
Continuity 
Provides enumerated values for continuity along geometry,
such as continuous first derivative or continuous unit tangent and curvature.
 
CurveEnd 
Defines the extremes of a curve through a flagged enumeration.
 
CurveEvaluationSide 
Defines enumerated values for the options that defines a curve evaluation side when evaluating kinks.
 
CurveExtensionStyle 
Defines enumerated values for styles to use during curve extension, such as "Line", "Arc" or "Smooth".
 
CurveKnotStyle 
Defines enumerated values for knot spacing styles in interpolated curves.
 
CurveOffsetCornerStyle 
Defines enumerated values for all implemented corner styles in curve offsets.
 
CurveOrientation 
Defines enumerated values for closed curve orientations.
 
CurveSimplifyOptions 
Enumerates the options to use when simplifying a curve.
 
DimensionForceArrow 
Arrowheads forced Inside, or Outside of extension lines, or moved to fit.
 
DimensionForceText 
Text forced Inside, Right or Left of extension lines, or moved to fit (Auto).
 
DistancingMode 
Defines how offset and similar operations should work.
 
EdgeAdjacency 
Enumerates all possible Topological Edge adjacency types.
 
ExtrudeCornerType 
Corner types used for creating a tapered extrusion
 
HiddenLineDrawingSegmentSideFill 
When a silhouette is projected on the image plane (determined by the camera location or direction),
and projects to a curve (not a point), the image area to the left or right of a projected silhouette
curve is filled with either the surface or a void.
 
HiddenLineDrawingSegmentVisibility 
The different types of HiddenLineDrawingSegment visiblity
 
IsoStatus 
Defines enumerated values for isoparametric curve direction on a surface, such as X or Y,
and curve sides, such as North or West boundary.
Note: odd values are all xconstant; even values > 0 are all yconstant.  
LightStyle 
Defines enumerated values to represent light styles or types, such as directional or spotlight.
 
LoftType 
Specifies enumerated constants for all supported loft types.
 
MeshExtruderFaceDirectionMode 
Defines how mesh extruder decides orients faces
 
MeshExtruderParameterMode 
Parameter mode for creating texture coordinates and surface parameters
 
MeshingParameterStyle 
Type of Mesh Parameters used by the RhinoDoc for meshing objects
 
MeshingParameterTextureRange 
Defines how to pack render/meshes textures.
 
MeshPipeCapStyle  Enumerates methods to end a mesh pipe.  
MeshType 
Defines enumerated values for various mesh types.
 
NurbsCurveNurbsCurveEndConditionType  What end conditions to set  
OrdinateDimensionMeasuredDirection 
Ordinate dimension measures x or y direction
 
PipeCapMode  Defines styles used for creating Brep pipes.  
PlaneFitResult 
Enumerates all possible outcomes of a LeastSquares plane fitting operation.
 
PointContainment 
Defines enumerated values for closed curve/point spatial relationships.
 
PointFaceRelation 
Enumerates the possible point/BrepFace spatial relationships.
 
RailType 
Rail types used for creating filleted Brep edges
 
RegionContainment 
Defines enumerated values for closed curve/closed curve relationships.
 
SilhouetteType 
Enumerates the different types of silhouettes and their origins.
 
SmoothingCoordinateSystem 
The direction of the smoothing used by Curve, Surface, and Mesh Smooth.
 
TextJustification 
Specifies enumerated constants used to indicate the internal alignment and justification of text.
 
TextRunType  
TransformSimilarityType 
Lists all possible outcomes for transform similarity.
