I am still trying to select faces and vertexes. For now i am trying to use the backbuffer for it. 24bit truecolor would give me enough colours for selecting them. But i am a bit puzzled on the glreadpixels command as it seems to write its data into pointer like structure.

-Are there any delphi tutorials or examples on the usage of it?

-When reading out only 1 pixel the date returned like a pointer to an array of byte allowing me to result[0] is red result[1] = green and result[2] = blue???

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Here is the code I use for occlusion testing of single pixels, your code would be very similar:


The last parameter in glReadPixels is a pointer to an array of your own, which is filled by the GL (in this special case of mine, it's a single float value, since I only read back the depth component of one pixel - more interesting (but not for this topic) would be the rectangular version, which is used to brighten/darken light flares, if a light source is partially occluded).

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i figured out the data returned

for var i need to use:
pixel: array [0..2] of GLubyte;

and the reading goes with: glreadpixels(....,@pixel);

But now an other problem appeared. I need to disable lighting. And use glcolor3f to provide a color for mesh (or face etc.) But that does not appear to work as my meshes all turn white. Hmm... Better return to the redbook again...

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