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This is a paid asset, but now you can download Sprite Slicer Free.
Sprite Slicer v1.331
Sprite Slicer Website
Slice, dice and explode any sprite in your game! Sprite Slicer allows you to quickly and easily cut any physics-enabled sprite into little pieces, each of which will then have its own realistic physics behaviour.
* Works on both Unity and 2D Toolkit sprites.
* Simple static script functions allow you to slice sprites along a given line, or explode them into multiple parts.
* Supports both concave and convex polygons.
* Optimised to preserve dynamic batching and reduce draw calls.
* Slices any sprite with a 2D box, circle or polygon collider.
* Easily restrict slices to particular sprites using LayerMasks.
* Full C# source code and example scene included.