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 an ellipsoid (ELL) and modeling the corresponding arrows for all parameters.  Here's an example:

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

Make something like that for the ELL, 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}