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Alpha-multitexturing problem

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Hello, I want to texture a terrain this way: - A big basemap (size b x b) - A big lightmap (size b x b) - A detail texture map 1 (size: a x a) - An alpha map that indicated, where texture 1 should be visible (size b x b) - A detail texture map 2 (size: a x a) - An alpha map that indicated, where texture 2 should be visible (size b x b) ... Therefore I want to use multitexturing (1pass). My problem is to combine the detail textures with the alpha maps and combine the result with the basemap. How can this be done? Thanks,

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it should run on a radeon 9000 or higher. i tested it with 6 textures and got around 60-80fps but i did not get it working with the alpha-maps.

the whole thing is also more for learning and testing opengl than for producing a high end app ;).

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