[gl2ps] Intra-quad lines when blending

[Fabian Wenzel]

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Hi!


I am using using gl2ps 1.2.1 and (apart from being happy most of the
time) am experiencing some problems when blending. The resulting pdf is
perfect except from a tiny hairline in a filled semitransparent GL_QUAD
that looks like it is twice opaque as the rest. This hairline crosses
the whole quad. The structure which is transparently occluded by the
quad has some color artifacts (it seems to be partially non-occluded)
near this intersecting hairline.

Does anyone know how to deal with it? I could provide a 52k example file.

Another hint which might be useful for other people: It has to be made
sure that localization is turned off when using gl2ps via

unsigned char *oldlocale = setlocale(LC_NUMERIC,"C");

/* ... gl2ps-drawing-stuff */

setlocale(LC_NUMERIC,oldlocale);

I am using gl2ps in a wxWidgets-app that turns on localization by
default. On my machine I ended up with corrupted output files before I
figured out that they were caused by german localization as the decimal
point is represented by a comma, so that the output streams were not the
way acrobat and ghostscript wanted them to be.

Thanks,

	Fabian


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