Attached is the POV used to create the also attached PNG file.

The aim is to create a library that will output pie charts as torus 
segments. The PNG is almost right where I want it.

Except for the rounding of the torus segments. This is all just 
approximations.

To do it properly, I somehow need to make a torus that is smaller on the 
inside of the large segmented torus.

Does anyone have any other ideas on how to do this nicely?

ALSO: I would love to make this render a hell of a lot faster, if anyone 
has any pointers.

Cheers!
Rick Measham

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Preview of image 'pie_torus.png'