Why does my 3D solid look correct but fail when I try to UNION it?

indiancad · 2026-09-04T12:02:34+0000

Have you ever had two 3D solids that look connected, but UNION does not combine them? One common reason is that the solids are only touching at an edge or face, rather than overlapping. A simple check is to move one solid slightly and use INTERFERE to see whether the two solids actually occupy the same space. If they need to become one solid, make sure they have a proper intersection and then run UNION again. How many of you have faced this problem? What was stopping the solids from joining?

By indiancad
53 minutes ago in AutoCAD 3D Modelling & Rendering

https://www.cadtutor.net/forum/topic/99290-why-does-my-3d-solid-look-correct-but-fail-when-i-try-to-union-it/

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