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This is a paid asset, but now you can download DrawingPhysics for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
DrawingPhysics v1.1.1
DrawingPhysics is a plugins for draw physic lines.
It use LineRenderer to draw lines,and add perfect base collider to lines automatically.
v1.1 Add Support for Mobile Touch.
I hope you like it!