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NVMeshMender triangle input format

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I'm using the NVMeshMender to calculate tangent / binormal info for my meshes. In the documentation it says that NVMeshMender requires: "2-manifold triangular geometry" to work correctly. I have never heard of this term before, and i have yet to find a good definition on the internet (perhaps it's known by another name) Currently my meshes are in a format suitable to be passed to a rendering API as arrays (ie/ list of indices, parallel vertex, tex-coord, normal arrays etc) What is required to convert these arrays to 2-manifold triangular format?

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2 manifold means an entirely closed, connected mesh. Most game models are already.

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cheers startfox; since posting, i have found that a mesh is 2 manifold if it is closed, and every edge is connected to exactly 2 polygons :)

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