Collider.Raycast

function Raycast (ray : Ray, out hitInfo : RaycastHit, distance : float) : boolean

Parameters

Name	Description
ray	The starting point and direction of the ray.
hitInfo	If true is returned, hitInfo will contain more information about where the collider was hit (See Also: RaycastHit).
distance	The length of the ray

Returns

boolean - True when the ray intersects any collider, otherwise false.

Description

Casts a Ray that ignores all Colliders except this one.

Same as above using ray.origin and ray.direction instead of origin and direction.

// pragma below is needed due to a UnityJS issue
#pragma strict

function Update(){
var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit : RaycastHit;
if (collider.Raycast (ray, hit, 100.0)) {
Debug.DrawLine (ray.origin, hit.point);
}
}