[Octave-bug-tracker] [bug #57464] patch plot of quadrilateral ill shaped

[Hg200]

Follow-up Comment #11, bug #57464 (project octave):

@Markus:
I have made a complete new built with your patch applied. It is awful slow.
But i can confirm the problem is solved and the MWE as well as the
streamribbon is displayed correctly.

As i have seen earlier during debugging for example fvc (face vertex data) is
called at least 3 times. it looks that something like a netlist (similar to
what a mesher creates for a finite element analysis) is created there from the
vertices given to patch () and written to idx and vert. but why 3 times? the
first time it is in a so called "2d" mode. or is this a gdb artifact?

it is somewhat beyond my scope but sounds crazy enough to spend a whole day
just stepping from _go_patch and see what it is happening in this mysterious
graphics.cc. this will result most likely in more questions than answers but
maybe there are also some findings - who knows ;-)

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