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I am using SOFA physics simulation to deform a yarn, first i have to get a discrete. version of the OBJ mesh. which is know in the format of VTK

There is an example in SOFA tested on bunny.obj and it works fine wheni test it to load the VTK.

Coming to mymesh, it loaded perfectly in SOA, however, it seems the exported file of yarn in OBJ has en error:

the error is: please add a tetrahedric topology component

I dont know what that mean, any idea, I dont think this is related to the code used in SOFA since I tested on other OBJ files in SOFA examples.

The OBJfile:https://gofile.io/?c=H65JiD

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