Hello,
I’m trying to implement a picking feature to my 3D scene using gluPickMatrix(). This works fine… except for nurbs objects !
First I would like to know is there is special known problem with picking nurbs ?
More explanation now…
Here is my rendering routine :
struct volume *pvol;
GLfloat knots[6] = < knots definition here >
GLfloat ctrlpts[3][3][3] = < control points definition here >
pvol=pvol0;
while(pvol != NULL){
if (mode == GL_SELECT) {
glLoadName(pvol->id);
}
< some code… >
switch (pvol->type){
case SPHERE:
glutSolidSphere(pvol->size, 36, 36);
break;
< some code managing other kind of objects >
case NURBS:
printf("plotting Nurbs
");
gluBeginSurface(theNurbs);
gluNurbsSurface(theNurbs,
6, knots, 6, knots,
3 * 3, 3,
&ctrlpts[0][0][0],
3, 3, GL_MAP2_VERTEX_3);
gluEndSurface(theNurbs);
printf("Nurbs done
");
break;
}
pvol = pvol->psuiv;
}
This compiles fine. But when I run the program, when the routine is called in GL_SELECT mode, application is hanging on nurbs rendering : the “Nurbs done” string never written despite “plotting Nurbs” is written. Behaviour in GL_RENDER mode is OK.
Any help would be very appreciate…
I’m using Linux Mandrake 8.2 with XFree86-devel-4.2.0
libMesaGLU1-devel-4.0.1 and
libMesaglut3-devel-4.0.1-4mdk
I have a nvidia TNT2 card with last nvidia driver.