[Tutorial] Cancel rigidbody slipping on a slope

I have been trying to stop a Rigidbody from slipping on a slope(with a frictionless surface), and I think figured it out.
So I thought this would be useful to share.
Here is my code.

Code (CSharp):

1. if (!onGround) return;
2.  
3. Vector3 slipDirection = (contactNormal - -Physics.gravity.normalized);
4. Vector3 slipVelocity = slipDirection  * Physics.gravity.magnitude;
5.  
6. rigidBody.AddForce(-slipVelocity, ForceMode.Acceleration);

I hope you find this useful.

 

You saved my day!
For more information: you can get

contactNormal

from this raycast:

Code (CSharp):

1. Physics.Raycast(transform.position, Vector3.down, out RaycastHit groundHit, distance, _groundMask);
2. Vector3 contactNormal = groundHit.normal;