vr
02-06-2001, 07:57 PM
Hi there,
Could someone tell me how to do texture mapping on a tessellated polygon, especially the one with a hole in it?
I have tried two methods:
1) Override the callback function of gluTessVertex(), and pass the vertices coordinates as well as texture coordinates as the argument(which is in void*). However, the system crashed!
2) Use glTexGen() and specify two planes(by specifying the coefficients of ax+by+cz+d=0) and let OpenGL generate the texture coordinates for me. However, the textures are incorrectly mapped and when I move the camera position/angle(by using gluLookAt()), the textures are "floating" on the polygon.
How can I do that? Can someone tell me what's wrong with my methods? Any links of how to do this in detail, or with examples? Thank you very much in advance!
Could someone tell me how to do texture mapping on a tessellated polygon, especially the one with a hole in it?
I have tried two methods:
1) Override the callback function of gluTessVertex(), and pass the vertices coordinates as well as texture coordinates as the argument(which is in void*). However, the system crashed!
2) Use glTexGen() and specify two planes(by specifying the coefficients of ax+by+cz+d=0) and let OpenGL generate the texture coordinates for me. However, the textures are incorrectly mapped and when I move the camera position/angle(by using gluLookAt()), the textures are "floating" on the polygon.
How can I do that? Can someone tell me what's wrong with my methods? Any links of how to do this in detail, or with examples? Thank you very much in advance!