[Octave-patch-tracker] [patch #8951] Automatically calculate "vertexnormals" and "facenormals" for patch objects

[Markus Mützel]

Follow-up Comment #29, patch #8951 (project octave):

As cross-reference from bug #53958:
The "VertexNormals" are calculated only if "VertexNormalsMode" is "auto",
"FaceLighting" or "EdgeLighting" are set to "gouraud" and a light object is
present in the same axes.
For the "FaceNormals" to be calculated, "FaceLighting" or "EdgeLighting" has
to be set to "flat" (which is the case with the default values) together with
the other two conditions.
That is what Matlab seemed to do when I looked at it.

Maybe this should be documented somewhere. But I don't know where this would
fit. In the docstrings for patch and surface maybe? 

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