I''m trying to make a lightray. That light that enters by the window untill the ground. I need to make my image(BMP or JPG) be gradient. It start strong when enter into the window and gets weak till reach the ground. An example of it is a enter in the contest. There is a image that explain all i wrote. Thanx for all...

No what you want to do is leave it un textured and color the vertexes.

Yeah, that makes sense!

For the lightray-coming-from-the-window, You might want to try to color the vertices, use a sorta random texture (mainly white with lotsa grey dots on it) and slowly translate the texture coordinates.

I saw this in a Quake3 shader (there''a a spotlight on the ceiling in q3dm0 for example) and it shows a light+dust effect quite well.

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SaM3d!, a cross-platform API for 3d based on SDL and OpenGL.
The trouble is that things never get better, they just stay the same, only more so. -- (Terry Pratchett, Eric)

Yeah hes right, if you add a bit of noise for a textrue, with colored vertexes it looks very nice...

Although depending on the situation a solid lightray would also look good.

i understood very well! i was just havin problems in my windows and the editor to make it isn''t installed yet. But it is all clear now!