private static void Display()
{
float[] knots = { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f };
// counter clockwise
float[ , ] edgePoints =
{
{ 0.0f, 0.0f },
{ 1.0f, 0.0f },
{ 1.0f, 1.0f },
{ 0.0f, 1.0f },
{ 0.0f, 0.0f }
};
// clockwise
float[ , ] curvePoints =
{
{ 0.25f, 0.5f },
{ 0.25f, 0.75f },
{ 0.75f, 0.75f },
{ 0.75f, 0.5f }
};
float[] curveKnots = { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f };
// clockwise
float[ , ] pwlPoints =
{
{ 0.75f, 0.5f },
{ 0.5f, 0.25f },
{ 0.25f, 0.5f }
};
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT);
Gl.glPushMatrix();
Gl.glRotatef(330.0f, 1.0f, 0.0f, 0.0f);
Gl.glScalef(0.5f, 0.5f, 0.5f);
Glu.gluBeginSurface(nurb);
Glu.gluNurbsSurface(nurb, 8, knots, 8, knots, 4 * 3, 3, controlPoints, 4, 4, Gl.GL_MAP2_VERTEX_3);
Glu.gluBeginTrim(nurb);
Glu.gluPwlCurve(nurb, 5, edgePoints, 2, Glu.GLU_MAP1_TRIM_2);
Glu.gluEndTrim(nurb);
Glu.gluBeginTrim(nurb);
Glu.gluNurbsCurve(nurb, 8, curveKnots, 2, curvePoints, 4, Glu.GLU_MAP1_TRIM_2);
Glu.gluPwlCurve(nurb, 3, pwlPoints, 2, Glu.GLU_MAP1_TRIM_2);
Glu.gluEndTrim(nurb);
Glu.gluEndSurface(nurb);
Gl.glPopMatrix();
Gl.glFlush();
}
