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SpazBoy the Mitey

Halp me I am a stupid newbie again!

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I am currently using an ortho projection to get the opengl coords to match the screen size for my 2d work, but I realise that with an ortho projection my objects do not get smaller as they go further away. Is there any way I can set up a perspective projection so that the top left point on the screen in (0,0) and the bottom right is (639,479) ????

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