Bug in the boolean->subtract ?

[d49l]

Hi!

When I'm using the boolean subtract function, I find that I often will lose polygons that shouldn't be removed. And I would get open holes in my object

This behaviour I first noticed when I subtracted many times on the same object. And particular when I subtract cylinders from my object as I becomes more comeplex.

I'm I doing something wrong or is this some kind of bug in AC3D :-( ?

Thanks for your help :-)

[Andy]

Hi - Using the boolean functions repeatedly on the same object can cause problems but you should check that all objects used are fully closed and all normals are outward-facing before using the booleans. There are other caveats with booleans - see the manual.

If you want to e.g. cut two cylinders from a sphere, it may be best to merge two cylinders and use that single object for the boolean, rather than performing two subtracts with one cylinder.

[d49l]

What I have found is that the boolean->subtract function creates holes in my closed objects

It isn't any rocket sciense... it happens even with fairly simple objects