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Sphere mapping

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Hello, i want to create a rotating moon. A found a texture map on NASA (, but it''s size is not square. Anyway, if i cut out the middle part (so it''s a square), i can map it, but i can''t rotate it this way (i suppose rotaring a gluSphere object, doesnt chance the mapping). An option is to create like 40 different maps (using photoshop) and creating the rotation effect by changing the texture each time. Anyway, i think there should be a better way to do this... thx, tom

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