> to switch between perspective and orthographic projection via "View >
> Projection". And it seems all manipulation operation (zoom, rotation,
> translation, etc.) works for me.

I haven't reviewed the code itself yet, but the feature doesn't quite work yet. 
In particular, I've tried 3 structures so far, and with each, I can easily use 
the zoom and/or rotate modes of the navigate tool to end up in an invalid view.

What do I mean? Take testfiles/benzene.fchk. Rotate for a while, and suddenly 
the screen goes blank. I'm not even sure what happened, because I can't get the 
camera back to display the molecule with the View-> Center command.

I think both the camera code and the navigate tool will need further 
"defensive" code to prevent the OpenGL view from becoming corrupt.

-Geoff
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