No Simulate Physics after using Slice Procedural Mesh

GreatBim · June 5, 2026, 2:44pm

Hi, I’m learning how to use the Slice Procedural Mesh function to slice an object in half. How ever after slicing, the upper half of the the mesh cannot enable the simulate physics anymore. I used the Set Simulate Physics funtions to set it but it wasn’t activated. Therefore I cannot use the Add Impulse function to push it away from the bottom half.

Does anyone know how why this happened?

BRGEzedeRocco · June 5, 2026, 5:16pm

Hello @GreatBim , Welcome to the forums!
From what I can see in the image, the Slice Procedural Mesh node is not connected to Set Simulate Physics, so it’s never being called.

Something you can do in cases like this is select the node you want to check and press F8 to add a breakpoint. Then run the game and see whether execution reaches that node. If it does, Unreal will pause automatically and you’ll be able to see what’s happening at that point.

Hope it helps!

GreatBim · June 6, 2026, 8:33am

Hi, thank you for your help. The returned procedural mesh is not generated since I didn’t tick the checkbox for “Create Other Half”. My main issue is with the existing procedural mesh after being cut. All the blueprints are reached but the simulated physics was never enabled again.

I did fix it but I truly have no idea why that is the case. The static mesh of the object I used was originally have only 1 simple box collision and that caused the issue. I had to delete that collision and create convex collision for it. The object after this change can enable “Simulate Physics” after slicing just fine.