[Octave-bug-tracker] [bug #44181] Tesselation lines visible in plot output of patches

[Dan Sebald]

Follow-up Comment #9, bug #44181 (project octave):

That doesn't sound correct to me.

I understand what the aliasing issue is, i.e., if there are two fill objects
sharing the same border having the same coordinates (which is what the OpenGL
fill is doing in this case, building the fill from individual triangles...it
could do better than this, of course).  The render could create some pixel
wide "seam", i.e., the background color comes through maybe every few pixels
if the line happens to be on a slant or something.

However, I don't think that is the case here because we are seeing some rather
wide gray tessellation lines.  More than that, some of these grey tessellation
lines are dashed lines, of all things.

Furthermore, I just reported another bug:

https://savannah.gnu.org/bugs/?44736

in which some strange fills/outlines are plotted on top of the axis lines in
grey.

SVG is created via gl2ps, as is PS and PDF.  I'm beginning to suspect that
gl2ps is putting some strange artifact into the plots...perhaps associated
with fills, and possibly after a fill/outlined-fill is used gl2ps goes into
some strange state where it continues to place (what is a bogus) outline
around anything fill-like.  Perhaps Octave is missing some initialization or
setup of gl2ps.


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