In physics, the bounciness of a surface is called the “coefficient of restitution”. The coefficient of restitution is represented as a number between 0 and 1, which defines how much speed an object retains in the opposite direction along the line of impact after a collisionA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a Rigidbody component and is in motion. More info
See in Glossary.
In PhysX, the Physic Material asset’s Bounce property has a value of 0–1, which represents the coefficient of restitution.
0 represents a completely inelastic collision (no bounce) 1 represents a perfectly elastic collision (full bounce) A value between 0 and 1 indicates a partially elastic collision with varying degrees of bounciness.
The default Bounce value in Unity is 0.
In physics simulation, you can also define a threshold at which colliders no longer bounce off each other. If two colliding objects have a relative velocity below the defined value, they do not bounce off each other. To configure the bounce threshold, go to the Physics Settings (Edit > Project Settings > Physics) and set the Bounce Threshold to the minimum velocity at which colliders should bounce. This value is set to 2 by default.
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.