In what cases should you use unions?

I’m currently making a game with in-doors levels.

I’m simply wondering if it’s more effective to put 6 parts together as a box or use unions to make a box out of a single mesh?
I’ve noticed a number of clipping issues related to unions, and I’m trying to get the best performance in general.

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Here’s an awesome thread about object optimization:

In brief, use unions if they have a sufficient number of parts and is only used once.

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Thank you very much! This was very useful. I didn’t know half of these simple tricks :o