Hi Martin,

> I just looked at the solids++ library you are using and one of its features is
> a precise hidden line removal:

That's true but so far in my previous initial tests with it, it did not seem like a very robust area of the kernel as-is and so it either needs some tuning or I will be writing a custom one myself.

I won't really know if that one just needs some tweaks or not until I'm able to devote a chunk of time to it.

- Michael