Unity3d detecting collision without physics

BoundsCollider.cs

/*
Tutorial (russian):
http://nodejso-tribar.rhcloud.com/collison-without-physics/
*/

using UnityEngine;
using System.Collections;

public class BoundsCollider : DrawBoxCollider {

    public Renderer targetRend;

    void Update()
    {
        if (currentRenderer.bounds.Intersects(targetRend.bounds))
        {
            gizmoColor = Color.red;
        }
        else
        {
            gizmoColor = Color.cyan;
        }
    }
}

DrawBounds.cs

/*
Tutorial (russian):
http://nodejso-tribar.rhcloud.com/collison-without-physics/
*/

using UnityEngine;
using System.Collections;

[ExecuteInEditMode] // Необязательно, но OnDrawGizmos() будет кидать null reference exception в редакторе

public abstract class DrawBounds : MonoBehaviour {

    protected Renderer currentRenderer;
    protected Color gizmoColor = Color.cyan;

    protected virtual void Awake()
    {
        currentRenderer = GetComponent<Renderer>();
    }

    private void OnDrawGizmos()
    {
        Vector3 center = currentRenderer.bounds.center;
        Vector3 size = currentRenderer.bounds.size;
        Gizmos.color = gizmoColor;
        Gizmos.DrawWireCube(center, size);
    }
}

DrawBoxCollider.cs

/*
Tutorial (russian):
http://nodejso-tribar.rhcloud.com/collison-without-physics/
*/

using UnityEngine;
using System.Collections;

public class DrawBoxCollider : DrawBounds {

}