[SOLVED] How to model a deformable object with a deep crevice?

[Wong]

Hello everyone,

I tried to use the TetrahedronFEMForceField to model a deformable cylinder with a deep crevice (as the figure shown below).
But since the crevice is too narrow, the collision model vertices of the crevice would map to the same tetrahedron, then the crevice would not be able to be opened.

Are there any simple ways to solve this problem?

[Hugo]

Dear @outtt ,

If I understand correctly, you want to simulate:
– a deformable object with an initial cut/crevice
– an auto-collision model

Is this correct?
Can you give us a bit of context: what kind of object is this suppose to be?

For collision, any simulation should start without a collision as initial condition. Therefore your collision parameters must be well chosen. I need to find some info regarding the auto-collision since I never did it myself.

Best,

Hugo

[Wong]

Hello @hugo,

It is indeed a deformable object with an initial cut/crevice, but not an auto-collision model.
I mean the problem is not the collision. You can even use the visual model instead.

The problem is the BarycentricMapping. The mapping would be not correct if such mesh is used to map to the tetrahedral mesh. The vertices of the crevice would map to the same tetrahedron.

Now can you understand it?

Wong

[Wong]

Hello @hugo

Thank you. I have solved the problem

[Hugo]

Great to hear @outtt, could you please explain your solution in a few words?

Hugo

[Wong]

Hello @hugo,

I think my solution is not the best one because it is fairly complex and use many components. In fact, my mesh object is in fact not a cylinder as the picture you can see. It is a more complex mesh which does not have a smooth flat cut. So I use the SubsetTopologicalMapping component.

But I do not think it is an elegant method. Because it would be troublesome if it is used in real time cutting. One cut has resulted in so much code, let alone the situation when many cuts occur, although I am not sure if the smooth flat one would have the similar problem.

So I still want a more elegant method.

By the way, can you answer my new question at this link?

[Author]

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