Package com.openinventor.inventor.nodes

Class SoNurbsCurve

  • All Implemented Interfaces:
    SafeDisposable
    Direct Known Subclasses:
    SoIndexedNurbsCurve
    public class SoNurbsCurve
extends SoShape
    NURBS curve shape node. This class represents a NURBS curve, based on the knot vector and the control points that you specify. The knotVector field specifies a floating-point array of values; the values are the coordinates of the knot points in the curve, and you must enter them in non-decreasing order. The curve will use the first numControlPoints values in the current coordinates as control points.

    If you specify n knots, you can specify up to n-8 control points. The number of knots minus the number of control points is known as the order of the curve. A NURBS curve can have an order of up to 8.

    The control points of the curve are transformed by the current transformation matrix. The curve is drawn with the current lighting model and drawing style (drawing style FILLED is treated as LINES). The coordinates, normals, and texture coordinates of a NURBS curve are generated, so you cannot bind explicit normals or texture coordinates to a NURBS curve.

    The approximation of the curve by line segments is affected by the current complexity value.

    Shape Antialiasing type is SoShape.LINES.

    File format/default:

    NurbsCurve {

      numControlPoints 0
      knotVector 0
    }

    Action behavior:

    SoGLRenderAction
    Draws the curve based on the current coordinates, material, and so on.

    SoRayPickAction
    Picks the curve based on the current coordinates and transformation.

    SoGetBoundingBoxAction
    Computes the bounding box that encloses all control points of the curve with the current transformation applied to them. Sets the center to the average of the control points.

    SoCallbackAction
    If any line segment callbacks are registered with the action, they will be invoked for each successive segment approximating the curve.

    See Also:
    SoFullSceneAntialiasing, SoIndexedNurbsCurve, SoNurbsSurface

    • Field Detail

      • numControlPoints

        public final SoSFInt32 numControlPoints
        Number of control points.

      • knotVector

        public final SoMFFloat knotVector
        The knot vector.

    • Constructor Detail

      • SoNurbsCurve

        public SoNurbsCurve()
        Creates a NURBS curve node with default settings.