Detecting Collisions

The OnCollisionEnter method can be used to detect a collision of a GameObject with another GameObject. In this example we are also using the GetComponent<Renderer>() method to access the object's renderer component, which controls its visual appearance.

We create a new script with the name ChangeColorOnCollision.

Add the following code to the script:

public class ChangeColorOnCollision : MonoBehaviour {
    private Renderer objectRenderer;
    public Color newColor;

    void Start() {
        objectRenderer = GetComponent<Renderer>();
    }

    void OnCollisionEnter(Collision collision) {
        if (collision.gameObject.tag == "wall") {
            objectRenderer.material.color = newColor;
        }
    }
}

In the Inspector tag the obstacle - in our case our frame as 'wall'