ContactPoint.normal

public Vector3 normal ;

Description

Нормаль к точке контакта.

using UnityEngine;

public class Example : MonoBehaviour
{
    // Print how many points are colliding this transform
    // And print the first point normal that is colliding.
    void OnCollisionEnter(Collision other)
    {
        print("Points colliding: " + other.contacts.Length);
        print("First normal of the point that collide: " + other.contacts[0].normal);
    }
}