Block instances will not select when in Boolean Difference command

I have a grouped ring of spheres, generated from a block instance. I can select it normally, however when I come to select it as the cutting device in Boolean Difference it wont select.

why… and what to do ?


Blocks are intended to be used as instances of a single set of geometry.
If you want to actually use the geometry for something like a Boolean, Explode it first so the block instance is replaced with a copy of the geometry in an editable form.

If you just want copies, then don’t use Blocks.
Does that make sense?

Take 2 minutes and read the Help article for Blocks. It describes what they are, what they are for, and the advantages of using them in the right situation.

Hi John,
thanks. I have had a read. I feel the help on them could be a bit better, I am aware of some quirks, yet they are not there.

I have started making blocks of things like rivets so that there is less to slow up the file when worked with on the pc and certainly my laptop. They are for boolean operations, so if I explode the group, then do the boolean difference, how do I get them back to being instances afterwards ? Undo will also undo the boolean ? I didnt see an answer in help.


Make a copy, explode the copy, Boolean difference…

Got it :smile:


3 posts were split to a new topic: Subobject selection in block instances