On 7/15/05, Felix Breuer
So if performance does matter you recommend avoiding framebuffer operations in general? I am thinking about how to display a clickable UI in front of a 3D scene and, naively, I would have drawn pixmaps on top of the scene using the framebuffer. If I try to do the same using texture mapped polygons, what is the best setup/projection to make it look like a flat window like UI? How to avoid perspective and blurring effects?
Use orthogonal projection with the same width and height as your resolution (to make it easier to target a specific position in pixel-units) and make sure you draw your polygons so they're the exact size of the bitmap of the texture. Remember that in OpenGL (x,y)=(0,0) is situated at your lower left and not your upper left (as in, for example, windows GDI). /S -- Sebastian Sylvan +46(0)736-818655 UIN: 44640862