First off, a quick introduction to others - Marcus has been working on the 
libmsym library, which is now being used in Avogadro V1.x for point group 
symmetry detection and symmetrization.

He's been working on what looks like a cool integration for AvoV2...

> Was wondering if anyone has some input on rendering symmetry elements in 
> Avogadro v2. There is a need for “disc” (mirror plane)

I think a generic "plane" (e.g., square) would be useful for things like Miller 
planes in crystals. Some programs also allow you to define a best-fit plane 
through a set of atoms and then make measurements (e.g., atom X is 4.5Å from 
the plane, etc.)

> and “vector” (rotation axis) geometries as well as alpha in order to make 
> things look good. Im currently using the “cylinder” and “sphere” geometries, 
> but as you can see they are not well suited for the job.

Vector/line would be useful primitives for a number of things.

-Geoff


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