// Casts a ray from (0,0,0) towards (0,0,1) to the infinity and prints a message
    // if any object has touched the ray.
    // To test it, just place any object and intersect it with the white drawn line
 
    function Update () {
        // shows the line that follows the ray.
        Debug.DrawLine(Vector3.zero, Vector3.forward * 100);
        if (Physics.Raycast (Vector3.zero, Vector3.forward, Mathf.Infinity)) {
            print ("There is something in front of the object!");
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        Debug.DrawLine(Vector3.zero, Vector3.forward * 100);
        if (Physics.Raycast(Vector3.zero, Vector3.forward, Mathf.Infinity))
            print("There is something in front of the object!");
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Update():
        Debug.DrawLine(Vector3.zero, (Vector3.forward * 100))
        if Physics.Raycast(Vector3.zero, Vector3.forward, Mathf.Infinity):
            print('There is something in front of the object!')