[Octave-bug-tracker] [bug #35126] pie3.m demo failure

[Ben Abbott]

Follow-up Comment #1, bug #35126 (project octave):

David Batemann looked into having gnuplot render 3D patches a while back.
Searching the archives might turn something up.

I recently took a look. It may be possible to triangulate a patch object and
then render. If the polygons are all simple and convex, then the problem is
straight forward. I can write a simple script for this case to demonstrate,
but don't have the time right now.

It may also be possible to handle simple non-convex polygons in the m-files,
used by the gnuplot backend, by constraining the triangles to lie within the
original polygon, but I'm skeptical that it will be robust without adding some
other meshing libs.

Ultimately, we need to be able to parse a complex polygon into a set of simple
polygons, and those into triangles.

Sorry for not adding more detail. If there are questions, I can try to fill in
the blanks.

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