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PLY polygon number

I currently work on PLY (Polygon File Format) reader in C++ openGl.

Is the number of points same for every polygon in PLY file?

EXAMPLE: 'N 1 2 3 .. M' is given polygon row in PLY file, it says that the polygon is made of N points.

Is the N same for whole file?

Solution

  • No, the number of points per face in a PLY file may vary from one face to the next. For example, the face list may contain a mix of both triangles and quadrilateral polygons, like this:

    3 0 1 2
3 0 3 1
4 4 0 2 5
4 6 4 5 7

    You can see an example of a full PLY file containing faces with different numbers of vertices at Paul Bourke's PLY File Format page.