2d sprite mask shader with polygon collider?

Hi there,

I am making a hole in a terrain using a mask:
alt text

I do this at runtime when the bullet hits the ground but the i don’t know how to recalculate the polygon collider?

This is the issue:
alt text

I want to recalculate the polygon collider with the mask so you can drive in the hole how can i ever achieve this?

@smokegun have you got any solution? Please share