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OpenGL Populous Style Skybox

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My terrain engine simulates the curviture of a planet much like Populous: The Beginning. My old method of showing clouds used a single quad with a scrolling texture of perlin noise, alpha blended so as to show the actual skybox which was drawn around the whole scene. The problem now is the curviture causes the horizon to dip down very low, and the scrolling overhead clouds aren't even visible anymore. What methods do you know of or would suggest to simulate moving clouds in this situation. I'm only going for semi-realistic, but I do want it reasonably fast. I'm using C++, OpenGL, and shaders (if shaders are to play a part) Thanks, Jake

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