Amnesia editor - Object Collisions?

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I believe if scaling the beam on one axis to make it shorter doesn't work, the only solution would be to alter the model in a 3D program. Slicing or otherwise altering meshes inside an engine is a pretty unusual feature and usually only there if it has a special gameplay purpose, not for level editing. (Like in Dead Rising 2, where you can dynamically cut through zombies and it will create and texture the new polygons at the intersections in realtime. ^^)