Can anyone explain what the math is behind if you want the texture to be perfect scale on the face on a brush, the axes need to define a plane that is parallel to the face's plane, otherwise you'll get stretching.
As I have read on the VERC it states: These axes are defined by tx1/y1/z1 and tx2/y2/z2, giving two vectors which define what's "right" and what's "up" relative to the texture - so if you wanted to go "right" 1 unit, you'd go along the first axis for 1 unit. Going "down" 2 units would be going backwards along the second axis for 2 units. How much the texture is offset along these axes is defined by toffs1 and toffs2, measured in HL units.
I am trying to work up a way to export a polygonal soup into MAP brushes for a simple editor I am working to understand the MAP format better. I have searched the web for days, and havent come close to any sensible solution to figuring out how these axis number come to be. I know that it has to do with Normals and can sort of figure out one set but not the 2nd set needed.
Thanks
You must multiply the vector for the s & t texture coordinates (right & up) with the vertex of your polygon, that's all. (Well, and add the offset of course :)
If you have a texture with offsets both 7 and s = (1,0,0), t = (0,0,-1) and a vertex at (20,200,96) you calculate for s: 20 * 1 + 200 * 0 + 96 * 0 + 7 = 27 and for t: 20 * 0 + 200 * 0 + 96 * (-1) + 7 = -89
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