How to do I go about welding parts together depending if their surfaces are touching?

[nicemike40]

If your parts are all rectangular and only rotated in 90-degree increments, something like this would work:

Detecting when a model is not grounded, not sure how to approach

Here’s some real code for you because I got interested! It only really works if the parts are rotated only in 90 degree increments (no weird angles). You can fix that by using Rotated Region 3 Module or something instead. I tried to comment it up a bit, let me know if you have any questions. It’s also possibly not very fast, so don’t run it too often -- creates a Region3 around a part which -- is slightly larger than the part. -- requires that the part be rotated only -- in …

That thread has some more discussion as well.