Body independent from a Node

I'm implementing triggers in my game and I'd need some way to add and remove triggers during the game.

Since triggers don't have a visual representation, do OgreNewt bodies need to be attached to a Node or can I have standalone bodies? If I can, how would I remove a body from the world?

The Ogrenewt bodies are standalone, always. You can however link an Ogre visual Node to a body so it moves in sync, but the OgreNewt body itself doesn't care about it. So no, you do not need visual nodes attached.

OK, thanks.

So, in that case, how would I remove a body from the physics world? I haven't found any method for that... Or should I destroy the body?

What I want is to be able to remove the trigger's body when the trigger is disabled to prevent all processing on that body and then re-add it when the trigger becomes enabled again.

I've been reading a bit of OgreNewt's code... but it hasn't gotten me too far... I couldn't find where in the code a body is added or removed from the world. So I would like to change my question:

How are bodies added and removed from the Newton world?

Is the body added as soon as it is constructed? Is the only way of removing a body deleting it?

It's most likely added to the world as soon as you create it and, yes, you just use delete to remove it:

//Create the collision object
OgreNewt::Collision* col = new OgreNewt::CollisionPrimitives::Cylinder(m_World, 1, 1);

//Create the Body
OgreNewt::Body* body = new OgreNewt::Body( m_World, col );
//The Body with collision is now in the World

//Destroy the collision (should do this after creation of the body normally)
delete col;

//Destroy the body when you're done with it
delete body;


Mmmh... OK. I don't really like it much. I was hoping for something like World::removeBody() which just would prevent the body from being included in physics calculations or triggering callbacks, rather than having to destroy and recreate it each time I want to disable/enable a trigger.

Well, I just found a post in the Newton forum where they talk about a feature like this:

http://newtondynamics.com/forum/viewtop ... emove+body

I believe the suggestion at the end of that post should be able to be implemented using OgreNewt. I'll try that.

EDIT: Indeed, that worked just fine.

Oh, I'm sorry - I thought you meant destroy when you said remove. Must've read too fast there