SoIndexedNurbsSurface — indexed NURBS surface shape node
Contents
Action Behavior
SoGLRenderAction
Draws the surface based on the current coordinates, material, and so on.
SoRayPickAction
Picks the surface based on the current coordinates and transformation.
SoGetBoundingBoxAction
Computes the bounding box that encloses all control points of the surface with the current
transformation applied to them. Sets the center to the average of the control points.
SoCallbackAction
If any triangle callbacks are registered with the action, they will be invoked for each successive
triangle approximating the surface.
Description
This shape node represents a NURBS surface based on the knot vectors and the control points that you
specify. The uKnotVector and vKnotVector fields specify floating-point arrays of values; the values are
the coordinates of the knot points in the surface, and you must enter them in non-decreasing order. The
numUControlPoints and numVControlPoints fields specify the number of control points the surface will have
in the U and V parametric directions, and will use the current coordinates that are indexed from the
coordIndex field.
You can get a surface of minimum order (2) in the U or V directions by specifying two more knots than
control points in that direction and having at least two control points in that direction. This surface
would appear creased in one direction.
You can get a surface of maximum order (8) in the U or V directions by specifying eight more knots than
control points in that direction and having at least eight control points in that direction.
The control points of the NURBS surface are transformed by the current cumulative transformation. The
surface is drawn with the current light model and drawing style. The coordinates, normals, and texture
coordinates of a surface are generated, so you cannot bind explicit normals or texture coordinates to a
NURBS surface. The first material in the state is applied to the entire surface.
The surface is trimmed according to the currently defined profiles curves.
When default texture coordinates are applied to a NURBS surface, the edges of the texture square are
stretched to fit the surface. The axes of the texture are called S and T; S is horizontal and T is
vertical. The axes of the NURBS surface are called U and V; U is horizontal and V is vertical. You can
also define texture coordinates explicitly with the S,T location point, the knot vectors, and the current
texture coordinates.
Fields
SoSFInt32numUControlPointsSoSFInt32numVControlPoints
Number of control points in the U and V directions.
SoMFInt32coordIndex
Coordinate indices.
SoMFFloatuKnotVectorSoMFFloatvKnotVector
The knot vectors in the U and V directions.
SoSFInt32numSControlPointsSoSFInt32numTControlPoints
Number of control points in the S and T directions.
SoMFInt32textureCoordIndex
Texture coordinate indices.
SoMFFloatsKnotVectorSoMFFloattKnotVector
The knot vectors in the S and T directions.
File Format/Defaults
IndexedNurbsSurface{numUControlPoints0numVControlPoints0numSControlPoints0numTControlPoints0coordIndex0uKnotVector0vKnotVector0sKnotVector0tKnotVector0textureCoordIndex-1}Inherits From
SoBase > SoFieldContainer > SoNode > SoShape > SoIndexedNurbsSurface
Methods
SoIndexedNurbsSurface()
Creates an indexed NURBS surface node with default settings.
staticSoTypegetClassTypeId()
Returns type identifier for this class.
Name
SoIndexedNurbsSurface — indexed NURBS surface shape node
See Also
SoIndexedNurbsCurve,SoNurbsSurface,SoProfileSoIndexedNurbsSurface(3IV)()
Synopsis
#include<Inventor/nodes/SoIndexedNurbsSurface.h>
Fields from class SoIndexedNurbsSurface:
SoSFInt32numUControlPointsSoSFInt32numVControlPointsSoMFInt32coordIndexSoMFFloatuKnotVectorSoMFFloatvKnotVectorSoSFInt32numSControlPointsSoSFInt32numTControlPointsSoMFInt32textureCoordIndexSoMFFloatsKnotVectorSoMFFloattKnotVector
Methods from class SoIndexedNurbsSurface:
SoIndexedNurbsSurface()staticSoTypegetClassTypeId()
Methods from class SoNode:
voidsetOverride(SbBoolstate)SbBoolisOverride()constSoNode*copy(SbBoolcopyConnections=FALSE)constvirtualSbBoolaffectsState()conststaticSoNode*getByName(constSbName&name)staticintgetByName(constSbName&name,SoNodeList&list)
Methods from class SoFieldContainer:
voidsetToDefaults()SbBoolhasDefaultValues()constSbBoolfieldsAreEqual(constSoFieldContainer*fc)constvoidcopyFieldValues(constSoFieldContainer*fc,SbBoolcopyConnections=FALSE)SbBoolset(constchar*fieldDataString)voidget(SbString&fieldDataString)virtualintgetFields(SoFieldList&resultList)constvirtualSoField*getField(constSbName&fieldName)constSbBoolgetFieldName(constSoField*field,SbName&fieldName)constSbBoolisNotifyEnabled()constSbBoolenableNotify(SbBoolflag)
Methods from class SoBase:
voidref()voidunref()constvoidunrefNoDelete()constvoidtouch()virtualSoTypegetTypeId()constSbBoolisOfType(SoTypetype)constvirtualvoidsetName(constSbName&name)virtualSbNamegetName()const