The triangle at the specified location.
[C++] HRESULT FindTriangleIndex( IPoint* pPoint, long* pTriangle );
pPoint is a parameter of type IPointpTriangle [out, retval] pTriangle is a parameter of type long
Returns the index of the triangle that encompasses the point.
If the point falls completely outside the TIN, including the area represented by its super nodes, the returned index will be 0.