Tao.OpenGl SDK Documentation |
|
Glu.gluNurbsSurface Method (GLUnurbs, Int32, Single[], Int32, Single[], Int32, Int32, Single[], Int32, Int32, Int32)
Defines the shape of a NURBS surface.
[Visual Basic]
Overloads Public Shared Sub gluNurbsSurface( _
ByVal
nurb As
GLUnurbs, _
ByVal
sKnotCount As
Integer, _
ByVal
sKnots As
Single(), _
ByVal
tKnotCount As
Integer, _
ByVal
tKnots As
Single(), _
ByVal
sStride As
Integer, _
ByVal
tStride As
Integer, _
ByVal
control As
Single(), _
ByVal
sOrder As
Integer, _
ByVal
tOrder As
Integer, _
ByVal
type As
Integer _
)
[C#]
public static
void gluNurbsSurface(
GLUnurbs nurb,
int sKnotCount,
float[] sKnots,
int tKnotCount,
float[] tKnots,
int sStride,
int tStride,
float[] control,
int sOrder,
int tOrder,
int type);
Parameters
-
nurb
- The NURBS object (created with gluNewNurbsRenderer).
-
sKnotCount
- The number of knots in the parametric u direction.
-
sKnots
- An array of sKnotCount nondecreasing knot values in the parametric u direction
-
tKnotCount
- The number of knots in the parametric v direction.
-
tKnots
- An array of tKnotCount nondecreasing knot values in the parametric v direction.
-
sStride
- The offset (as a number of single precision?–floating-point values) between successive control points in the parametric u direction in control.
-
tStride
- The offset (in single precision?–floating-point values) between successive control points in the parametric v direction in control.
-
control
- An array containing control points for the NURBS surface. The offsets between successive control points in the parametric u and v directions are given by sStride and tStride.
-
sOrder
- The order of the NURBS surface in the parametric u direction. The order is one more than the degree, hence a surface that is cubic in u has a u order of 4.
-
tOrder
- The order of the NURBS surface in the parametric v direction. The order is one more than the degree, hence a surface that is cubic in v has a v order of 4.
-
type
- The type of the surface. The type parameter can be any of the valid two-dimensonal evaluator types (such as GL_MAP2_VERTEX_3 or GL_MAP2_COLOR_4).
Remarks
Use gluNurbsSurface within a NURBS (Non-Uniform Rational B-Spline) surface definition to describe the shape of a NURBS surface (before any trimming). To mark the beginning of a NURBS surface definition, use the gluBeginSurface command. To mark the end of a NURBS surface definition, use the gluEndSurface command. Call gluNurbsSurface within a NURBS surface definition only.
Positional, texture, and color coordinates are associated with a surface by presenting each as a separate gluNurbsSurface between a gluBeginSurface/gluEndSurface pair. No more than one call to gluNurbsSurface for each of color, position, and texture data can be made within a single gluBeginSurface/gluEndSurface pair. Exactly one call must be made to describe the position of the surface (a type of GL_MAP2_VERTEX_3 or GL_MAP2_VERTEX_4).
A NURBS surface can be trimmed by using the commands gluNurbsCurve and gluPwlCurve between calls to gluBeginTrim and gluEndTrim.
Note that a gluNurbsSurface with sKnotCount knots in the u direction and tKnotCount knots in the v direction with orders sOrder and tOrder must have (sKnotCount - sOrder) multiplied by (tKnotCount - tOrder) control points.
EXAMPLE
Glu.gluBeginSurface(nobj);
Glu.gluNurbsSurface(nobj, . . ., Gl.GL_MAP2_TEXTURE_COORD_2);
Glu.gluNurbsSurface(nobj, . . ., Gl.GL_MAP2_NORMAL);
Glu.gluNurbsSurface(nobj, . . ., Gl.GL_MAP2_VERTEX_4);
Glu.gluEndSurface(nobj);
See Also
Glu Class | Tao.OpenGl Namespace | Glu.gluNurbsSurface Overload List | gluBeginSurface | gluBeginTrim | gluEndSurface | gluEndTrim | gluNewNurbsRenderer | gluNurbsCurve | gluPwlCurve