[Octave-bug-tracker] [bug #45494] Patches have spurious (antialising) lines in vector printout

[Dan Sebald]

Follow-up Comment #32, bug #45494 (project octave):

This setting has no affect for me.

Here is the test script I used:


graphics_toolkit('fltk');
sombrero;
set(get(gca,'children'),'linestyle', 'none');
print('-dpsc','gl2ps_sombrero_surf.ps');
print('-dpdf','gl2ps_sombrero_surf.pdf');


I see the same gray cracks in xpdf viewer for PDF and gv for PS.  The
interesting result is that viewing PDF unzoom there don't seem to be any
cracks/lines *along the four-sided elements*, just running between points.  I
wonder if there was some extra slop put in the size of those elements so that
the elements overlap a bit.  When I zoom in both PDF and PS, then I start to
see strange effects along the quadrangle borders.

But that doesn't mean something couldn't have been fixed in your system. 
Newer gl2ps version?  Newer drivers?  The OpenGL stuff seems like a bit of
magic, video cards even being an issue and all.

One drawback to the removal of GL2PS_NO_PS3_SHADING is that printing slows
down to at least twice as long.  It seems to take a good five seconds to print
without that parameter, whereas without the change printing takes about one
and a half seconds.

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