Rays that color the object they touch. How?

Unity Engine
1

How would i make this script color the object the rays touch?

function Update () {
var dwn = transform.TransformDirection (Vector3(0, -1, 0));
if (Physics.Raycast (transform.position, dwn, 10)) {
print ("There is something below the object!");

}
}
2

Hello there!

That depends a bit on what shader you’re using.
If it’s the standard Diffuse then this could should work:

function Update () {
    var dwn = transform.TransformDirection (Vector3(0, -1, 0));
    var hit = new RaycastHit();
    if (Physics.Raycast (transform.position, dwn, hit, 10)) {
        hit.collider.gameObject.renderer.material.color = Color.red;
    }
}
3

thanks!

4

How do i make it to where the rays are cast every second?

5

I’m not exactly sure what you mean, but if you want to cast only one ray a second you’ll need a timer.
Something along these lines:

var timer = 0.0f;

function Update () {
    timer -= Time.deltaTime;
    if(timer <= 0)
    {
        timer = 1.0f;
        var dwn = transform.TransformDirection (Vector3(0, -1, 0));
        var hit = new RaycastHit();
        if (Physics.Raycast (transform.position, dwn, hit, 10)) {
            hit.collider.gameObject.renderer.material.color = Color.red;
        }
    }
}
6

alternatively you could use a coroutine

void Start(){
StartCoroutine("RayRoutine");
}

IEnumerator RayRoutine(){
     while (true){
          // DO RAYCAST
          yield return new WaitForSeconds(1.0f);
     }
}