BRL-CAD provides a couple dozen distinct primitives.  Each primitive is defined by a set of parameters.  We'd like to have each primitive modeled with diagramming arrows and labels.

This task involves creating a torus and modeling the corresponding arrows/segments for all parameters.  Scalars should be dashed lines, vectors should be arrows.  Here's an example:

• http://brlcad.org/~starseeker/gci_primitive_figures/

Make something like that for the torus, but with different material properties.  That example put objects into a box for a particular visual effect.  See if you can get a better effect without the exterior box (you'll have to change shader properties).

Submit your .g file and a ray traced rendering/diagram of the model.  This command run within mged may help:

rt -s1024 -A0.75 -c {set ambSamples=128}