HI....i want to incorporate a picture of a tree on my created surface..As of now i have it setup such that it is drawn on two quads but i dont want the quads to be visible so that it gives realism to my tree....how would i go about doing that...basically it looks like a rectangle which the picture of a tree now..how do i eradicate this look...and blend the tree with the background...the tree image is transparent...plz let me know as soon as possible...thank u. Opengl Rules !!

How can it look like a quad if the tree texture is transparent? Or is you´re tree a rectangle ;-). Are you using a texture that is either alpha-tested or has an alpha-map (with a GL_RGBA format)? Or are you multi-texturing? If your answer to any of these questions is no, I suggest you support a file format with an alpha-map, like Targa or PNG.

What you probably want to do is the technique called billboarding, instead of explaining it to you in this reply, I suggest you go to Nate´s OpenGL Page. There you can download a tutorial on billboarding aswell as a tutorial on loading .tga files and many more tutorials.. such as backface culling, bsp´s, .ase model loading, multi-texturing, normals, et cetera.

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Drago, VerSoft