Turning on and off Rigidbody programmatically?

Questions & Answers
1

Here is a code snippet I found that should turn off and on gravity (changing the bool)

function OnTriggerEnter (other : Collider)
{
    if (other.attachedRigidbody)
    {
        other.attachedRigidbody.useGravity = true;
    }
}

I would like to know how to make it turn on the gravity of a specific object when another object collides with the trigger. THanks in advance.

2

So you want to do what that code does, but only selectively, instead of for everything. That would be:

function OnTriggerEnter (other : Collider)
{
    if ((other.attachedRigidbody)&&(other.tag == "gravObject"))
    {
        other.attachedRigidbody.useGravity = true;
    }
}

Or if you want the gravity to change for ObjectA when ObjectB hits TriggerC. which would be:

var gravObject : Transform;

function Awake()
{
    gravObject = GameObject.FindWithTag("GravObject").transform;
}

function OnTriggerEnter (other : Collider)
{
    if (gravObject.rigidbody)
    {
        gravObject.rigidbody.useGravity = true;
    }
}
3

Create a reference to the `GameObject` that's supposed to get gravity and reference that in your trigger:

var gravityObject : GameObject;

function OnTriggerEnter(other : Collider)
{
    if(gravityObject!=null && gravityObject.rigidbody!=null)
        gravityObject.rigidbody.useGravity = true;
}
4

That code turns the gravity on to the "other" which is the gameObject which has entered the gameObjects trigger. Have you got RigidBody attached to the other gameobject ? with gravity unchecked ?