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OpenGL Multipass rendering in OpenGL

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Hmm, how the heck do I do a ultipass rendering in ogl so that I can use hardware accelerated lights? eq. render the scene, change the light pos and render it again and blend the new result with the previuos etc. etc. Maybe I should ask myself if it''s possible do that first /Damage Inc.

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it is possible to do this ( though i ask myself why would u want to )

u do need at least 2 passes

position lights
render scene
reposition lights
enable some blending state
rerender scene


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