collision detection for the camera

Scripting Issues
1

hi,

I am very new at panda and I am having some problems with collision.
I am trying to create a game where the user will be able to move around with the mouse in a fairly large town. I want to do collision detection between the camera and the scene. I cannot use the default solids to do this because my scene is very complicate. For the moment I don´t care about performance.

import direct.directbase.DirectStart
from pandac.PandaModules import *
from direct.interval.IntervalGlobal import *

base.cTrav = CollisionTraverser()
pusher = CollisionHandlerPusher()


#load a model  (in normal case here will be the town)
town= loader.loadModel('models/teapot.egg')
town.reparentTo(render)
town.setPos(0,150,0.5)
town.setScale(10,10,10)

#use the camera as a from object to detect collisions with all the geometry of the scene
fromObject = base.camera.attachNewNode(CollisionNode('colNode'))
fromObject.node().addSolid(CollisionSphere(0, 0, 0, 1))
fromObject.node().setIntoCollideMask(BitMask32.allOff())
fromObject.node().setFromCollideMask(GeomNode.getDefaultCollideMask())


#add collision node to the traverser and the pusher
base.cTrav.addCollider(fromObject,pusher)
pusher.addCollider(fromObject, base.camera, base.drive.node())
base.cTrav.showCollisions(render)

run()

I can see that collisions are been made from base.cTrav.showCollisions(render) but the camera is still passing through the scene.

Am I doing something wrong here? Is there any other way to do this except ODE and OdeTriMeshGeom?

thanks

2

You never turned on drive mode, so your camera is still in trackball mode, which doesn’t respond to base.drive.node(). Did you mean to call:

base.useDrive()

?

David

3

thanks David. You were right. As I said before I am new at Panda and I am confused with the functionality of camera(trackball, mouse e.t.c).

I have another question now. The application is really slow so I must improve my collision detection. Before I will try tagging my models I want first to load my scene(the same scene but with much lower number of polygons) as a collision solid but I didn´t figure how.

the ideal case would be something like this:

...

smiley = loader.loadModel('myScene.egg')
smiley.reparentTo(render)

cNode = CollisionNode('scene')
cNode.addSolid(CollisionSolid('mySceneOptimized.egg'))
cNode.setIntoCollideMask(BitMask32.bit(1))
cNode.setFromCollideMask(BitMask32.allOff())
smileyC = smiley.attachNewNode(cNode)

…

any help would be much appreciated.
thanks

4

Edit the egg file to add the “barrier” tag. See the Panda3D manual for more about this.

David