ContactPoint.normal

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public var normal: Vector3;

public Vector3 normal;

Description

Normal of the contact point.

The following example will draw a line to represent every normal from a collision. Each line will be drawn in the Scene view.

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

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnCollisionEnter(Collision other) {
        print("Points colliding: " + other.contacts.Length);
        print("First normal of the point that collide: " + other.contacts[0].normal);
    }
}