How to review "invisible" geometry

[Philippe Hurbain]

I'd like to have a short tutorial added to the prim page explaining what steps have to be made to "see" an ering or 1-16chrd (don't know: substitute the code with other prims, edges, triangle, quad, cond) , that you might watch the effect in LDView. Something like that.

"obvious" method: turn on high level primitive substitution. erings become visible...