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Some rendering programs require that all surface normals point in the same |
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direction. (ie: On a closed cube, all normals point outwards). You can use |
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the points on the faces to determine the direction of the normal, by making |
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sure that all points are either in clockwise or counter-clockwise order. |
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How do you go about orienting all normals in the same direction, given a |
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set of points, edges and faces? Say that you had a cube with all faces that |
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have their normals facing outwards, except for one face. What's the |
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best way to realize that face is "flipped", and should have it's points |
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re-ordered? I thought I had a good way of telling this, but then realized |
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that the algorithm I had would only tell you if you had points in clockwise |
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order for a 2d polygon. I'd like something for 3d data. |
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Any hints, tips, references would be appreciated. |
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Steve |
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Where humor is concerned there are no standards -- no one can say what is good |
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or bad, although you can be sure that everyone will. -- John Kenneth Galbraith |
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------- These opinions are my own. |
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