// Calculate the transform's position relative to the camera.
    var cam = Camera.main.transform;
    var cameraRelative = cam.InverseTransformPoint(transform.position);
    if (cameraRelative.z > 0)
        print ("The object is in front of the camera");
    else
        print ("The object is behind the camera");

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Transform cam = Camera.main.transform;
    public Vector3 cameraRelative = cam.InverseTransformPoint(transform.position);
    void Example() {
        if (cameraRelative.z > 0)
            print("The object is in front of the camera");
        else
            print("The object is behind the camera");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public cam as Transform = Camera.main.transform

    public cameraRelative as Vector3 = cam.InverseTransformPoint(transform.position)

    def Example():
        if cameraRelative.z > 0:
            print('The object is in front of the camera')
        else:
            print('The object is behind the camera')

    // Calculate the world origin relative to this transform.
    relativePoint = transform.InverseTransformPoint(0, 0, 0);
    if (relativePoint.z > 0)
        print ("The world origin is in front of this object");
    else
        print ("The world origin is behind of this object");

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        relativePoint = transform.InverseTransformPoint(0, 0, 0);
        if (relativePoint.z > 0)
            print("The world origin is in front of this object");
        else
            print("The world origin is behind of this object");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        relativePoint = transform.InverseTransformPoint(0, 0, 0)
        if relativePoint.z > 0:
            print('The world origin is in front of this object')
        else:
            print('The world origin is behind of this object')