Hi,

For starters I am a new to MOI.

I imported a 3rd party STEP file and it seemed fine.

See attached.

After it was imported it behaved like a single object. Selecting it worked as expected, the entire object highlighted.

But after working with my project for awhile something happened and now the imported object is a bunch of separate parts.

What did I do to cause that? I cannot put them back together using the boolean union command for some reason.

Thanks.

Frederick