Instability in Tetrahedron Cutting

[CherryJGit]

I'm trying to replace the msh model in the liver2-cut.scn file with my own msh (converted via gmsh). The result is that the original model remains stable after cutting, but after replacing it with my model, strange phenomena occur, such as chaotic flipping at the cutting edge and the widening of the cutting opening. I only replaced the model and didn't change anything else. Could you please help me figure out what the problem is?

[epernod]

Hi,

could you post some images to illustrate your problem.
What is the resolution of your new mesh?

Best regards

[CherryJGit]

hi,
The front part is my tetrahedral mesh and the second cut of the back part is my problem
thank you

video.mp4

[CherryJGit]

Effects like this will then disappear on their own and report an error.
https://github.com/user-attachments/assets/7712234a-4bc4-4b41-a0cc-a727ea157f88

[epernod]

Hi,

yes this is definitively a bug in the tetrahedral incision algorithm.
Could you provide the SOFA scn with the mesh and the position of the sphere you set, in order to reproduce the bug.

Thank you