Can you remove a rigidbody from a gameobject AND the "world"

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Is it possible to remove a rigidbody from a gameobject AND the physics simulation? Background: creating collectible items that are dropped. These items drop, come to rest and then the rigidbody/collider should be removed from the gameobject AND from the physics simulation.
(Actually I don't care if they are removed from the gameobject just that the physics simulation stops processing them)

I want the gameobject to remain, think of it as debris if that helps. Changing layers or such concerns me because they are still being simulated and I want A LOT of these to be generated over time. (Thousands to maybe millions) without bringing the physics simulation to its knees. (Yes I know I will at some point become display bound, but I want that to be my bottle neck, not physics, that is removed, no collision)

Answer 1

Best Answer

Answer by fafase · Dec 06, 2012 at 05:48 PM

 collider.enabled = false;
 rigidbody.isKinematic =true;

No physics, no collision

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Answer 2

Answer by Screenhog · Dec 06, 2012 at 05:25 PM

Why not just deactivate the rigidbody component once it falls asleep? (Details on Rigidbody Sleeping)

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vbbartlett · Dec 06, 2012 at 05:37 PM 0

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How do you deactivate the rb component?
Sleep is currently what I am using, but I am putting them on a "NoColis" layer, but am uncertain about performance when I ramp up the numbers.

Answer 3

Answer by astorga · Dec 06, 2012 at 05:31 PM

To stop physics simulation with a specific GameObject, just set "isKinematic" to "true" in Rigidbody component. You can still use OnTrigger and OnCollision functions.

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vbbartlett · Dec 06, 2012 at 05:33 PM 0

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Please reread the question.

astorga · Dec 06, 2012 at 05:35 PM 0

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I considered the following sentence: "(Actually I don't care if they are removed from the gameobject just that the physics simulation stops processing them)"

vbbartlett · Dec 06, 2012 at 05:40 PM 0

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But the still collide with things... I need them removed

astorga · Dec 06, 2012 at 05:46 PM 0

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In that case, just set rigidbody.detectCollisions to false. According to manual, "Disabling collision detections is useful when you have a ragdoll which is setup to be kinematic and you want to avoid heavy collision detection calculations on that rigidbody."

http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody-detectCollisions.html

vbbartlett · Dec 06, 2012 at 05:50 PM 0

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That doesn't work, that simply turns off collisions, the rb is still active in the world, (falls forever)

Can you remove a rigidbody from a gameobject AND the "world"

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