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boldyman

texture uv

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Hello, I have a uv coordinate question. When you texture two triangles the uv coordinates would be : 0,1 ****** 1,1 * /* * / * * / * 0,0 ****** 1,0 (By the way: i use gl_triangles and read a triangle and uv like this: x y z u v 20.0 80.0 0.0 1.0 1.0 20.0 20.0 0.0 1.0 0.0 100.0 20.0 0.0 0.0 0.0 20.0 80.0 0.0 1.0 1.0 100.0 20.0 0.0 0.0 0.0 100.0 80.0 0.0 0.0 1.0 ) This i understand. What would be the texture coordinates for a shape build of four triangles, like so: ****** * /* * / * * / * ****** * /* * / * * / * ****** I like to put the texture over the whole shape ! Is this possible and what are then the uv coordinates ???? Can someone explain this to me ? Thanx

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Your diagrams got a little screwed up... But I think you want to read up on UV values and why they are in the 0.0 to 1.0 range. To stretch it out over 4 triangles like you show:


0,1**********1,1
* / *
* /
0,.5*********1,.5
* / *
* / *
0,0**********1,0


The idea is pretty simple. Take the entire surface that you want the texture to be applied to. The corners of this entire surface will always be (0,0) (1,0) (1,1) (0,1). If you want the texture cordinate of any point on that surface, find how far it is (percentage) along the U and V axis. Then this value is your texture coordinate if you're going from 0 to 1.

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