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Lightmaps and Triangles.

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When I want to create lightmaps for a bunch of triangles, what should the lightmap look like? To clarify what I mean, a lightmap texture is square, a triangle is, well, a triangle. This means that If i create a separate texture for each triangle, half of all the texture occupes wasted space. Is it reasonable to create one lightmap texture, and use one half of it for one triangle and the other half for another?

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