MoI discussion forum
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Full Version: Ballooning artefacts on STEP files

From: pastasaus
25 Feb   [#1]
Hi folks,

When importing client STEP files, I'm sometimes seeing these weird ballooning artefacts particularly around screw heads. It's causing some meshing issues that I'd like to avoid so we can optimise the model for animation downstream in our pipeline.

Any thoughts on what might be causing it and if there is a straightforward fix?

Thanks!

Image Attachments:
Screenshot 2026-02-24 133846.png 


From: Michael Gibson
25 Feb   [#2] In reply to [#1]
Hi pastasaus, those are areas where there was a problem with splitting up edges that cross over the seam edge of a closed surface.

What version of MOI are you using? The first thing I'd recommend if you're using version 4, is to try with the v5 beta which you can get here:
https://moi3d.com/beta.htm

- Michael