Object Selection with large number of objects

I've got a scene with 10,000 GameObjects in it and I'm trying to implement Mouse Click object selection.

I've done this by doing the following:

  • Attach a MonoBehaviour Component to the GameObject and override OnMouseDown().
  • Add a Box Collider to the object to get mouse events.

I'm looking for a more optimal way to do this, something similar to this:

  • When the user clicks the mouse, run a RayCast from the cursor location to see if it hits a GameObject. If it does, select that object.

Ideally, this logic only runs when the user clicks the mouse and I don't have to run OnMouseDown() on every one of my 10,000 GameObjects in every frame to determine a hit.

So the question I have is, which GameObject do I attach this script to so I only execute this logic when the user clicks the mouse? Or are there better ways to implement object selection?

You only need one instance of the script, and you can put it wherever you want. Probably on an empty GameObject, and name it SelectionManager or SelectionSystem (etc).

Here's a raycast selection snippet I've modified to your needs (updated to Javascript).

function Update ()
   if ( Input.GetMouseButtonDown(0) )
      var hit : RaycastHit;
      var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
      if (Physics.Raycast (ray, hit, 100.0))