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PLY: Export alpha channel for vertex colors

Authored by Adrian Vogelsgesang (vogelsgesang) on Jan 25 2019, 12:42 AM.



So far, the alpha channel was always set to 255 in the exported .ply file independent of the actual alpha channel of the vertex color.
With this commit, the alpha channel is now exported correctly.

The corresponding import code is already correct and a roundtrip of a simple model with alpha vertex color now works as expected.

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This revision is now accepted and ready to land.Jan 25 2019, 2:28 AM