Download Impact – Physics Interaction System Free Unity. 

The impact is a powerful and flexible material-based interaction system for producing interactions such as audio, particle, and decal interactions.

Check Out the Web Demo

Documentation | Discord | Forum

So what can you do with Impact?

Here are just a few examples of how you can use Impact to spice up your game:

PHYSICS INTERACTIONS
• Play audio when physics objects collide with each other with sounds based on the collision velocity and the objects’ materials.
• Play sliding and rolling sounds.
• Emit particles on collision.
• Leave decals behind on collision.
• Works great with rigidbodies connected by joints as well as ragdolls.