Thanks for the explanation Pilou but I was hoping for an explanation why this does not work. If I move the sphere 1 mm up, the problem is solved, so there must be some intersection or so which generates bad geometry. I made sure the seams were on the other side, so that can't be the problem.
Hi wim, it's just a guess since it will take a lot of work to confirm but I think it's probably the positioning of the bottom sphere's "pole" right nearby (but maybe not quite precisely on?) the intersection between the surfaces:
When I use Construct > Curve > Isect to generate intersection curves and zoom in to that pole closely it seems that the intersection curves come close to it but don't quite hit it directly.
The local area right around the pole of a sphere is kind of a sensitive zone because one direction of the surface is collapsing down to a single point. That causes some kinds of degenerate conditions for things like derivative and normal calculations. There is stuff in place to try and deal with those but maybe if you're just at the right spot nearby it, it can still be problematic.
I DO want to have a good time and be light with everybody... but i also forget that i am in a multi national setting, and i don't always get my point across....
And google ruins it, because they have a thing called "translate", which is NOT a translator, but a simple and often incorrect word exchanger...
But i'v learned to live with it.... it causes me to Take things, literally!
boolean after.3dm
