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Is this a triangulated irregular network?

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Can a torus, a sphere or a generic surface be a TIN? So, if we represent overhangs and caves, are we still having a TIN? What's the difference between any model from a 3d tool and a TIN? (Is a TIN used as a 3d surface representation or is only used in terrain modelling field?) Thank you ;)

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AFAIK a TIN is any surface that's modeled with non-overlapping triangles. Any well modeled mesh that gets sent to a graphics card would be a TIN. I believe that the "non-overlapping" part of the definition means that the triangles do not intersect, not that they can't occupy the same x coordinates if their z is different. So folded objects like a cave would be classified as a TIN as long as none of the triangles intersected with eachother.

-me

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