WandererFan

Sometimes the ViewProvider does not call claimChildren() right away. Eventually the Balloon should move itself under the Page.

should be fixed by #11999.

This sounds a lot like the gsoc Unified Measurement Facility. https://forum.freecad.org/viewtopic.php?p=733478#p733478

@hlorus - comments re umf work in progress?

Whenever I've run TechDraw under valgrind, the majority of time is spent deep in the bowels of occ calculating intersections. Off hand, I can't think of anywhere TechDraw does enough...

I can't be sure without a test file, but those BOPAlgo_Alert messages look like something you'd get if the input shape has problems. @pavltom - might need your help here.

The bad positioning and self interfering shape messages indicate that there are problems with the geometry of the source objects. OCC really does not like problems with geometry.

You can't get a 3d ref from a 2d ref. Projection is not an invertible operation. At best, you could scan every 3d vertex (or edge as the case may...

This issue should be closed.

You can use the the view direction to try to determine if the view seems to be axonometric (ex (1,1,1)) but the orientation of the subject object may mean that...