Open Formats: Interchange Import - UCX Convex Hull Import Bug

When importing custom UCX collision meshes from FBX files into Unreal Engine, certain geometry profiles fail to generate correctly if the option "One Convex Hull Per UCX" is unchecked. The engine's collision generation pipeline either creates an "exploded" collision shape with vertices shooting out infinitely into world space, or collapses the hull into a completely solid, simplified block that ignores structural openings such as doors and garage entryways.

See attached PDF for more details.

1. Import any of the attached problematic asset files into Unreal Engine.
2. In the FBX Import Options dialogue, explicitly uncheck the option One Convex Hull Per UCX.
3. Open the newly generated Static Mesh Asset in the Static Mesh Editor.
4. Toggle Simple Collision visibility to visually verify the distorted, shifted, or collapsed green hulls.