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View Full Version : Any method to texture map a tessellated polygon?



vr
02-06-2001, 08:57 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!

rIO
02-07-2001, 12:40 AM
Some OGL fanatic will flame me for this reply but... I think it's always better to do triangulation/tesselation by yourself instead of using Tesselator functions from GL implementation.
That way U can have more detail on how your data is managed and of course make your texture coords creation more easy.

rIO.sK http://www.spinningkids.org/umine