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projection matrix

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Hi I'm rendering a 3d model and only now noticed that the matrix I thought was perspective was ortho (I'm trying to do all the matrix calculations myself). Ever since, I've been trying to plug in a perspective projection matrix, only to always get a somehow distorted (stretched along z sometimes). I've tried using gluPerspective, which I think works (I'm so confused now :) ), but I can't figure out what matrix it uses. I've tried using projection matrix from Irrlicht and from Real Time Rendering book (page 65), no good. thanks

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