[Request] Collision Filtering Support from Blender

Bullet has built in support for collision with filtering the simplest and fastest being masks. It is a perfect fit for the iPhone to keep the performance at peak. If there was some way to specify the collision type and what it can collide with in Blender that would be superb. I am not sure what the best way to do this would be so I was hoping you had some ideas. Maybe something in the user variables that would make sense...

The only code change that would need is in sio2_physic.cc line 364. it would just need to pass 2 extra parameters to the Bullet addRigidBody method:

Code:


// Current way
_SIO2physic->_btSoftRigidDynamicsWorld->addRigidBody( _SIO2object->_btRigidBody );


to:

Code:


enum collisionTypes {
    COL_NOTHING  = 1<< 0,    //Collide with nothing
    COL_SHIP        = 1<< 1,    //Collide with ships
    COL_WALL        = 1<< 2,    //Collide with walls
    COL_POWERUP  = 1<< 3    //Collide with powerups
}
 
int objectCollidesWith = COL_SHIP | COL_WALL;

_SIO2physic->_btSoftRigidDynamicsWorld->addRigidBody( _SIO2object->_btRigidBody,
                                                                                      COL_SHIP /* collsion type of this object */,
                                                                                      objectCollidesWith /* bitmask of collisionTypes that this object should collide with */ );


+1

I have been looking at this as well as I had wanted filter collisions thru collisions masks...you approach is exactly the one I was envisioning. Would be great to have it natively implemented as part of SIO2...

Cheers

Ok sounds like a good idea but what is the workflow that you envision to integrate that within blender?

Let me poke around in Blender a bit to see what makes the most sense. It would be nice if everything could be done from withing Blender.

I agree... but honestly at the moment I can't see where it can fit in...

How 2 about user variables in Blender.

CollisionObjectType - This could be an integer that can pretty easily be mapped to a bitmask to be sent off to Bullet
ObjectCollidesWith - comma delimited list of integers that correspond to CollisionObjectTypes. On parsing, they can be added to the bitmask that gets sent to Blender.


I cant see any Blender built in controls that would work for this so user variables seem like the way to go. It would be pretty trivial to add the two variables for any objects that you want to be included with the collision masks.

Allright i'll think about it...