Question Vector3 orthogonal to plane

Mathemagicians to the rescue!

A sphere collides with a plane. Now I need to correct collision.relativeVelocity.magnitude to the proportion that is orthogonal to the plane.

I know Vector3 has some static methods that can calculate such things, but I have no idea what to use and how exactly.

 

planeNormal * Vector3.Dot(planeNormal, velocity)

will give you the velocity towards that plane

 

Thank you for the ultrafast reply! How would you change the following code? I do need a float in the end. Sorry, I'm oviously a noob.
Your help is appreciated a lot!

Code (CSharp):

1.  
2. using UnityEngine;
3.  
4. public class AkRtpcAndAudio : MonoBehaviour
5. {
6.     private float Force;
7.  
8.     private void OnCollisionEnter(Collision collision)
9.     {
10.         Force = collision.relativeVelocity.magnitude;
11.         Debug.Log(Force);
12.     }
13. }
14.  

 

mhh i think OnCollisionEnter happens after collision so you dont even have the right values anymore. could be wrong, its just out to the top of my head and i cant take a look at it right now so maybe someone else can help continue here?