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2D grid onto sphere

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Hi

I have a quad from vertex on 2D.I must map this points onto sphere.I can calculate a sphere but the real problem is calculating sphere from my vertexes.How can I do that?

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It's not clear what you want to do. It's a little confusing because you have a 2D quad and want to calculate something about a sphere (3D).

Do you want a circle with the same area as the quad? Do you want the circle to fit inside the quad?

Can you explain what you want to do in a different way, perhaps?

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