I want to be able to map a texture to the uppermost hemisphere of the inside of a sphere. It's actually a picture of the sky and I'm using a sphere rather than putting it straight on to the background (so that it's not fixed when I move around as is the case when using the background).
Being lazy, I don't want to generate the texture coordinates and normals myself - especially when they're already available for a primitive shape like a sphere. But the simple approach will mean that the texture map will be applied to the whole sphere and not just the upper hemisphere.
Can anyone please tell me how to map the texture to the upper hemisphere only. There must be a way. This must be a common problem.
As a workaround, I guess I could double the size of my image but I would prefer a more elegant solution.
Thanks, -Paul
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