Hi Dave,

> I never use 'update' calls in my code.

Do you call .commit() though? commit() implicitly calls update() if there has not been an update done once already.

The same thing goes for commit() as update() - avoid calling that interactive mode stuff if you intend to use calculate().

The 'ghost' effect that you're describing comes from the object having the "no hit test" flag set on it - that means that it does not go into the regular hit test map so it cannot be targeted for snaps or click selections. That's to avoid things like drawing a line and having the next point you pick getting snapped on to that same line that is in the geometry database from the previous mouse move.


- Michael