[Octave-bug-tracker] [bug #39535] FaceAlpha property not working for OpenGL backend

[Markus Mützel]

Follow-up Comment #18, bug #39535 (project octave):

@Rik: It looks like some viewers do not support rendering transparency. E.g.
Evince didn't show transparency for both Pantxo and me while the very same pdf
was rendering with transparency when I opened it in Adobe Acrobat Viewer.
Which programs did you use to display the svg and pdf?

@Pantxo: It sound reasonable to delay that change.
A feasible improvement could be to first render all objects that DO NOT
contain any semi-transparent faces, turn the depth check (occlusion) off after
that and than render the objects that DO contain semi-transparent faces. That
could help to reduce the number of faces (in some cases) but doesn't sound as
complicated as true back to front sorting.
I never studied what "gl2ps-print" does and how it is doing it. Thus, I don't
know whether that would be even possible.
Anyhow, that can probably wait for a later changeset.

The same change might improve some situations where solid objects disappear
behind transparent objects in gl-render.

What do you think?


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