In Corona 15 Hotfix 2,
have you noticed any difference in the behaviour of the CoronaSlicerMtl material?
It seems that the ‘cap sliced geometry’ option no longer works on a flat object,
whereas it did work in Corona 13.
The difference became apparent when we recalculated a scene created in Max 2024+Coro 13
in Max 2026+Coro 15HF2:
the Slicer material no longer filled the hole created by the Slicer object.
Are you sure the gaps were actually capped in “before”.
From “before” POV, you might have been simply seeing the backside of the polygon, not an actual geometry by slicer cap.