Slicing of PolygonColider2D

Hey Guys,

I spent hours thinking about this one!
I am trying to copy and then slice polygon collider2D.
On the left I have my game object, with sprite renderer and polygon collider.
I take this sprite renderer, I "slice" it to triangles and then I create multiple game objects with mesh renderers (see right).
My problem is, how can I create sliced versions of the very same polygon collider from previous sprite renderer?

Do you know about some algorithm which one can do it?


Thank you very much for any kind of support.