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Well Gemini was a raycaster, not a "real" 3D engine. Which I believe is what ben_g wants. Applying textures in raycasting is easy because of the vertical scanline rendering method and the restrictions of the camera.

Ok, here is my method. I'm literally making it up as I write this post, but in the end it should work. For this you should use triangles....2. Calculate the relative size of the leftmost point. (3d window distance thing / distance)3. Now calculate the relative size of each of the other two points and subtract the original from them....

[offtopic] Congrats ben_g: 100th post !