   NURBS trimming issue
  Hello,   I made part of sphere using gluNurbsSurface() function. It looks like this:I want to trim it using gluNurbsCurve() function. Trim curve will go counter-clockwise. These curves will be at the each side of NURBS surface. It looks like this:So finally, I put everything together:gluBeginSurface(nobj);  //begin my surface  gluNurbsSurface(...myNURBS...);  //draw my part of sphere  gluBeginTrim(nobj);    gluNurbsCurve(...curve_1...);  //first trimmig curve    gluNurbsCurve(...curve_2...);  //second trimming curve    gluNurbsCurve(...curve_3...);  //3rd trimming curve  gluEndTrim(nobj); gluEndSurface(nobj);  //end my surfaceAfter this procedure, I should get same image like first, full NURB, but I get just part of my NURB. It looks like this after trimming:  Any ideas, what I am doing wrong? I will wait any suggestions and ideas. Thank You[Edited by - alcotester on May 10, 2009 10:14:01 AM]
  [help][tears]   ;  bump   ;  any replies please?;  Try shifting the trim by small deltas to see if you can align it; might be a simple coordinate system issue.You should really be using a GLSL geometry shader for NURBS as GLU is probably doing the polygonization in slow software mode as always.   