Ghost Body

[jamesm6162]

Hi

I need to have a body that can be moved around manually like a kinematic body, and collect contact points with other bodies, but does not affect the bodies it collides with.

Is it best to do it in the NewtonContactsProcess callback set using NewtonMaterialSetCollisionCallback, by rejecting the contact points, while storing them somewhere I can access them later?

How exactly do I reject contacts inside this callback, as the callback returns void.

Regards

James

[Julio Jerez]

In the callback you can do something like this.

Code: Select all

         void* contactList[32];
         for (void* contact = NewtonContactJointGetFirstContact(contactJoint); contact; contact = NewtonContactJointGetNextContact(contactJoint, contact)) {
            contactList[countCount] = contact;
            countCount ++;
         }

         for (int i = 0; i < countCount; i++) {
            NewtonContactJointRemoveContact(contactJoint, contactList[i]);
         }

[jamesm6162]

Ok so you literally remove the contacts from the ContactJoint.

And this is the correct/most effective way to make a body ignore all contacts, while still saving them somewhere?

Thanks!

[Julio Jerez]

contacts are being removed and added all the time.
the logic for disabling collision in one contact add lot of complexity. it is simpler to jus delete it.
contacts and a joint are the same thing. when you make a joint the add the same contacts.

[jamesm6162]

Thanks for the help Julio