Auto Primitive Collider

Questions & Answers
1

Difficult 3 in 1 question. Sorry for so many links. Trying to keep this apparently short.

(1) I want to detect mouse clicks (or touch) on any object in the screen. Seems like we need colliders for that…

(2) Problem is I have many different kinds of objects, animated or not, none with a single primitive collider made for them.

The idea is to create those primitive colliders automagically at runtime, kinda like applying convex to the maximum.

The question is: how? I don’t think any of the scripts linked here would help much for the solution I’m looking for.

(3) Would it help somehow making the colliders ignore each other?

4

Found out the answer, thanks to new colleagues: Octree.

And here’s a possible implementation, from Neodrop. I’ve found it here.

I will elaborate on this later on, when I’m able to implement it.

2

You could use a couple approaches to detect mouseclicks. Just to detect mouse click, use function OnMouseOver()
{
//Whatever you want to happen when mouse is over object
}

to detect click

if(Input.GetMouseButtonDown(0))
{
//Whatever you want to happen when you left click
}

Attach this to a box for a test to get you started. This will detect when the mouse is hovering over that box object, and if you click on it.

function OnMouseOver()
{

 if(Input.GetMouseButtonDown(0))
 {
     Debug.Log("Mouse clicked on an object!");
 }

}

Another Approach is to attach a Javascript to the main camera, using RayCast. This works on a camera that moves with mouseLook. It casts a ray from the center of the screen.

function Update()
{
var direction = transform.TransformDirection(Vector3.forward);
var hit : RaycastHit;

 if (Physics.Raycast (transform.position, direction, hit, 1000))
{
         Debug.Log("HIT!");
    }

}

There are many other way, but I think this will give you a start. Look in Unity Script reference for more information on these techniques.

3

gameObject.AddComponent(“BoxCollider”);

gameObject.AddComponent(“SphereCollider”);

gameObject.AddComponent(“CapsuleCollider”); 3

or

gameObject.AddComponent(“MeshCollider”).isConvex = true;