[GEM-dev] Improving Stereoscopic Anaglyph Rendering (red-cyan)

[meschi at posteo.de]

Hi,

Well actually when I compile the code from the Github repository the 
anaglyph stereo c++ code does not seem to be used. After some confusion 
why my changes in the source (Manager.cpp) seemed to have no impact, I 
noticed that [gemwin] is no longer a native object as it is with the GEM 
shipped by Ubuntu. The source in Manager.cpp does not seem to be called 
at all, as it seems to be exchanged with a pd-native [gemwin] 
implementation. The abstraction [gemwin] however renders the anaglyph 3d 
erratically.

I have attached an image that demonstrates this problem. To me it looks 
like the green channel is opaque while above the red channel whereas the 
red channel is transparent when above the green one. The green channel 
should be blending with the red channel, but it blocks the red image 
information.

There is a pull request I have opened on Github with a fix for this 
problem (https://github.com/umlaeute/Gem/pull/187).

Best,
Kilian
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