Ondrej:
> > Povray is not open source (so it has to be in Debian non-free), so I
> > don't think SAGE should depend on or use povray.

Ondrej, thanks for sharing your opinion.

Boothby:
> Sage doesn't need to distribute / depend upon non-free software.
> However, it does have interfaces to lots of non-free software, like Magma, 
> Mathematica, etc.

+1

A major goal of Sage has always been to:

     unify existing mathematical-related software, both free and  commercial.

Though it is annoying that the license for
povray is not GPL-compatible, povray is still very interesting
software, and making
it easy for people to combine the functionality of Povray with Sage
just makes sense.

The Goals for SAGE:

  (1) Provide a cross-platform distribution of free open source
mathematical software that is easy for anybody to build, modify, etc.

  (2) Provide a new library of functionality that ties (1) together,
and functionality-wise provides a viable free alternative to Maple,
Mathematica, Matlab, and Magma.

  (3) Provide interfaces to a huge range of existing mathematical software.

 -- William

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