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Spherical Texturing

Started by angelhernandez Mar 9, 2009 at 12:53 PM 0 replies 700+ views

Original Post

Mar 9, 2009 at 12:53 PM

Hi, I'm using D3DXCreateSphere to create a sphere, and I want to texture that sphere. I'm using the formula tu=asinf(normal.x)/D3DX_PI+0.5f; tv=asinf(normal.y)/D3DX_PI+0.5f; to texture the Sphere, but it shows the texture twice on the sphere, one on the front and one on the back, and I want it to completely texture the sphere only once. So my question what is the formula to texture the sphere all around once. For example, Create a sphere globe and texturing it with a world map texture.

jollyjeffers

Mar 9, 2009 at 3:49 PM

Spherical mapping is unfortunately non-trivial. Try wrapping a piece of paper around a tennis ball for example [smile]

You'll almost certainly have to deal with some sort of distortion - either as compression at the poles, or as unused texels in the source texture.

I don't have any links to hand (only ever seen it discussed in books) but there should be a bunch of papers/articles on various spherical mapping algorithms available via your favourite search engine.

hth
Jack

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