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[Nick]

I read in Red Book about making a tree in such way: you draw a rectangular polygon and then apply on it a texture of a tree. But I looked in some sources of prog where such tree is used, and, as I understood, the main work is did by glTexEnv() and texture image *.rgb. What the hell is this *.rgb? Photoshop refuses to read such format and in Red Book written, that to make billboarding you must have an image with alpha component, so, as I realised, this *.rgb image has one. Am I right and where can I read and/or convert bmp, jpg e.t.c to this rgb?