Bullet Position of node contact

Scripting Issues
#1

Hello,
I am using bullet, and I am testing collision, and I wish to know the pos of one of the object collided:

result = world.contactTest(self.bodyNP.node())
for node in result.getContacts():
    myFirstObject=node.getNode1()
    print myFirstObject.getPos()

AttributeError: 'libpandabullet.BulletGhostNode' object has no attribute 'getPos'

or

AttributeError: 'libpandabullet.BulletRigidBodyNode' object has no attribute 'getPos'

I am colliding one bulletGhostNode with a bulletRigidBodyNode.

How can I retrieve position from this bulletNode?

Thanks
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#2

I’m not exactly sure what your code does, but this is what I use for ‘bullet’ collision.

        self.pickerTraverser.traverse(render)
        
        entries = []
        for i in range(self.pickerCollisionHandler.getNumEntries()):
            entry = self.pickerCollisionHandler.getEntry(i)
            entries.append(entry)
        
        if(len(entries) > 0):
            entries.sort(lambda x,y: cmp(self.DistanceFromCam(x.getSurfacePoint(render)),
                                         self.DistanceFromCam(y.getSurfacePoint(render))))
            
            point = entries[0].getSurfacePoint(render)

The important part is entry.getSurfacePoint(render). The Collision Entry objects are what contain all of the useful information about a collision.

#3

In fact, I use bullet (the physic engine) to create node, and manage collision.
My program runs as a server, and it is about AI, and not for the player himself.

So I don’t think your solution can be applyable.

I think it must be an easier way to grab position from collision test

But thank you for your time

#4

BulletRigidBodyNode is derived from PandaNode. You can get the position the same way as you would get it from any other node in the scene graph (e. g. a GeomNode):

node.getTransform().getPos()

Or you create a NodePath for this node:

np = NodePath(node)
np.getPos()