Hi Alain, also in your last image there it is possible that you are getting some general rendering artifacts such as "self shadowing" on polygons that are nearly vertical to the light source or things similar to that.

It is possible that you could solve that by tweaking some kinds of rendering parameters, or maybe by moving the light over a bit or things like that.

If you produce a denser mesh by using a tighter angle, it can help to make some kinds of rendering artifacts be reduced.


Remember - when you're dealing with polygons the data you are working with is actually made up of some completely flat facets, it is only some kinds of display tricks that make things appear as if they were actually smooth.

If you use more polygons, some of those display tricks get a bit higher accuracy because the actual faceted shape begins to more closely approximate a true curved surface instead of a faceted one.

- Michael