Physics.Linecast  

static function Linecast (start : Vector3, end : Vector3, layerMask : int = kDefaultRaycastLayers) : boolean

Description

Returns true if there is any collider intersecting the line between start and end.

var target : Transform;
function Update () {
    if (!Physics.Linecast (transform.position, target.position)) {
        ProcessData.AndDoSomeCalculations();
    }
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Transform target;
    void Update() {
        if (!Physics.Linecast(transform.position, target.position))
            ProcessData.AndDoSomeCalculations();
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public target as Transform

    def Update():
        if not Physics.Linecast(transform.position, target.position):
            ProcessData.AndDoSomeCalculations()

static function Linecast (start : Vector3, end : Vector3, out hitInfo : RaycastHit, layerMask : int = kDefaultRaycastLayers) : boolean

Description

Returns true if there is any collider intersecting the line between start and end.

If true is returned, hitInfo will contain more information about where the collider was hit (See Also: RaycastHit). Layer mask is used to selectively ignore colliders when casting a ray.