Package com.openinventor.inventor.nodes

Class SoNurbsSurface

java.lang.Object
com.openinventor.inventor.Inventor
com.openinventor.inventor.misc.SoBase
com.openinventor.inventor.fields.SoFieldContainer
com.openinventor.inventor.nodes.SoNode
com.openinventor.inventor.nodes.SoShape
com.openinventor.inventor.nodes.SoNurbsSurface
All Implemented Interfaces:
SafeDisposable
Direct Known Subclasses:
SoIndexedNurbsSurface
public class SoNurbsSurface extends SoShape
NURBS surface shape node. This shape node represents a NURBS surface based on the node's knot vectors and on control points constructed from the current coordinates. The current coordinates are used in row-major order (the V direction corresponds to the rows). The number of coordinates used is determined by the numUControlPoints and numVControlPoints fields. The uKnotVector and vKnotVector fields contain floating point arrays of non-decreasing values.

The order of the surface in the U and V directions is defined as the number of knots minus the number of control points in the particular direction. The largest order allowed for a NURBS surface is 8.

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 profile's 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. The number of texture coordinates used is determined by the numSControlPoints and numTControlPoints fields.

The approximation of the surface by polygons is affected by the current complexity value.

NOTE:

File format/default:

NurbsSurface {

    numUControlPoints 0
    numVControlPoints 0
    numSControlPoints 0
    numTControlPoints 0
    uKnotVector 0
    vKnotVector 0
    sKnotVector 0
    tKnotVector 0
}

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.

See Also:

  • Field Details

    • numUControlPoints

      public final SoSFInt32 numUControlPoints
      Number of control points in the U direction. Default is 0.

    • numVControlPoints

      public final SoSFInt32 numVControlPoints
      Number of control points in the V direction. Default is 0.

    • numSControlPoints

      public final SoSFInt32 numSControlPoints
      Number of control points in the S direction. Default is 0. Not used.

    • numTControlPoints

      public final SoSFInt32 numTControlPoints
      Number of control points in the T direction. Default is 0. Not used.

    • uKnotVector

      public final SoMFFloat uKnotVector
      The knot vectors in the U direction. Default is 0.

    • vKnotVector

      public final SoMFFloat vKnotVector
      The knot vectors in the V direction. Default is 0.

    • sKnotVector

      public final SoMFFloat sKnotVector
      The knot vectors in the S direction. Default is 0. Not used.

    • tKnotVector

      public final SoMFFloat tKnotVector
      The knot vectors in the T direction. Default is 0. Not used.

  • Constructor Details

    • SoNurbsSurface

      public SoNurbsSurface()
      Creates a NURBS surface node with default settings.