Not run trim, split, and boolean commands

[blitz.dmitriy]

Explain why the trim, split, and boolean commands do not run on polysurfaces “a” as opposed to “b”. What is the error and how to fix it?

a vs b.3dm (264.5 KB)

[pascal (Pascal Golay)]

Hello - the difference is that the objects in a do not intersect cleanly - they have large areas of overlap/near coincidence and this makes it hard to impossible to locate a clean curve of intersection ,necessary for the operations you mention. Use the Intersect (in a Wireframe view) command on these objects - that will give you an idea where things do not work well. Intersect is a tolerance based calculation though, so by setting file tolerance to maybe .0001 in DocumentProperties > Units. you may get a decent curve from Intersect.

-Pascal

[blitz.dmitriy]

@pascal

Hello - the difference is that the objects in a do not intersect cleanly - they have large areas of overlap/near coincidence and this makes it hard to impossible to locate a clean curve of intersection ,necessary for the operations you mention. Use the Intersect (in a Wireframe view) command on these objects - that will give you an idea where things do not work well. Intersect is a tolerance based calculation though, so by setting file tolerance to maybe .0001 in DocumentProperties > Units. you may get a decent curve from Intersect.

-Pascal

Thanks, Pascal. You’re great. After setting the new tolerance parameters, the intersection curve was obtained. Then cut out the bottom part and painted again. That was good. I wish there was a better way to do it.