Protect critical code paths in 3D viewer

I have yet to see a crash from such an issue, but it could clearly happen, so let's make it safe

Protect critical code paths in 3D viewer
I have yet to see a crash from such an issue, but it could clearly happen, so let's make it safe
aa2da210 · Guillaume Seguin · e41dc4f0 · aa2da210
Commit aa2da210 authored Apr 02, 2014 by Guillaume Seguin
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Showing with 203 additions and 194 deletions

actors.py printrun/gl/libtatlin/actors.py +203 -194

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--- a/printrun/gl/libtatlin/actors.py
+++ b/printrun/gl/libtatlin/actors.py