I tried many things to understand how collision works, but it never worked as it supposed to do.
My situation:
I have two boats, boat1 and boat2.
If boat1 hits boat2, it supposed to be pushed back (and offcourse the same with boat1)
It is a top-down situation, with the models both moving in one task-cycle.
How can I deal with this? I looked at the examples given in the manual, but I have to say that it doesn’t reveal the whole mystery of collision for me. Is there someone here able to write a small example for my situation?
Sorry not to go very deep into the details. I’m waiting at an airport.
There is two quick check you can do for your collision code:
Does the bitmask i set for my collider objets match the bit mask i set to
my collided object?
ex: you have 1 ball and several boxes and you want to detect when ball collides into boxes.
You would set a bitmask of 001 to all boxes
You would set a bitmask of 001 to the ball.
(If you set a bitmask of 100 to the ball then it will never collide with the boxes)
Did i add my collider objet to the collision Handler?
in previous example, you would have to use “addCollider” function of your colllision traverser with your Ball
Manakel, thanks for your input. The collision on the objects are working now.
But there is still one question left. I have a track model made in blender (Flat, it is a top-down sitution) with collision meshes in it.
How can I keep the objects on the track if they want to move out of it?
(Or better said: How can I push the objects back if they are NOT colliding on the track?)
Yes I could, but isn’t it easier to use the model I already have and program collision around that?
So I have spheres around the moving models, it should be possible to let it collide when the model is moving out from the model. (The models are moving 1px above the track-model)
Hm, can anyone tell me what I’m doing wrong in the following code?
I tried to make it work, but it just won’t parse the message that it is colliding when not on the track.
base.cTrav = CollisionTraverser()
#base.cTrav.showCollisions(render)
self.pusher = CollisionHandlerPusher() # Hier wordt de collision Handler ingeladen
self.cHandler = CollisionHandlerEvent() # Hier wordt de collision event ingeladen
self.cHandler.setInPattern("collide-%in")
eventMASK = BitMask32.bit(2) # Bitmask aanmaken voor de events
cNode1 = CollisionNode('Pusher')
cNode1.addSolid(CollisionSphere(0,0,0,6.90))
cNode1.setIntoCollideMask(BitMask32.allOff())
cNode1.setFromCollideMask(BitMask32.bit(0))
autoC1 = self.auto2.attachNewNode(cNode1)
cNode2 = CollisionNode('Event')
cNode2.addSolid(CollisionSphere(0,0,0,1.1))
cNode2.setIntoCollideMask(BitMask32.allOff())
cNode1.setFromCollideMask(eventMASK)
autoC2 = self.auto2.attachNewNode(cNode2)
cNode = CollisionNode('auto1')
cNode.addSolid(CollisionSphere(0,0,0,6.90))
cNode.setFromCollideMask(BitMask32.allOff())
cNode.setIntoCollideMask(eventMASK)
autoC = self.auto1.attachNewNode(cNode)
#autoC.show()
self.ground = self.track.find("**/track_coll")
self.ground.node().setIntoCollideMask(BitMask32.bit(0))
self.picker = CollisionTraverser()
self.queue = CollisionHandlerQueue()
self.pickerNode = CollisionNode('mouseRay')
self.pickerNP = camera.attachNewNode(self.pickerNode)
self.pickerNode.setFromCollideMask(BitMask32.bit(0))
self.pickerNode.setIntoCollideMask(BitMask32.allOff())
self.pickerRay = CollisionRay()
self.pickerNode.addSolid(self.pickerRay)
self.picker.addCollider(self.pickerNP, self.queue)
self.groundCol = CollisionNode('playerRay')
self.groundRay = CollisionRay()
self.groundColNp = self.auto1.attachNewNode(self.groundCol)
self.groundRay.setOrigin(0,25, -1)
self.groundRay.setDirection(0,-1,0)
self.groundCol.addSolid(self.groundRay)
self.groundCol.setFromCollideMask(BitMask32.bit(0))
self.groundCol.setIntoCollideMask(BitMask32.allOff())
self.floorHandler = CollisionHandlerFloor()
self.floorHandler.addCollider(self.groundColNp, self.auto1)
self.Zcoll = CollisionTraverser()
self.ZcollQueue = CollisionHandlerQueue()
self.Zcoll.addCollider(self.groundColNp, self.ZcollQueue)
self.Zcoll.showCollisions(render)
self.groundColNp.show()
self.pickerNP.show()
self.pusher.addCollider(autoC1,self.auto2)
base.cTrav.addCollider(autoC1,self.pusher)
base.cTrav.addCollider(autoC2, self.cHandler)
for i in range(self.ZcollQueue.getNumEntries()):
entry = self.cHandler.getEntry(i)
name = entry.getIntoNode().getName()
if name != "track_coll": self.TrackCollideHandler(entry)
def TrackCollideHandler(self, colEntry):
print "Collide op baan"
can you print the value of Name?
I dont remember if the name provided by the entry is the name of the collision node or the name of the parent.
In this first case, you may have to do a
name=entry.getIntoNode().Parents(0).getName()
(beware of syntax error, i have no panda3D installed right now)
Ehm, seems that I cant print the name at all… At least, it won’t show anything… Not with:
for i in range(self.ZcollQueue.getNumEntries()):
entry = self.cHandler.getEntry(i)
name = entry.getIntoNode().Parents(0).getName()
if name != "track_coll":
self.TrackCollideHandler(entry)
print name
And not with:
for i in range(self.ZcollQueue.getNumEntries()):
entry = self.cHandler.getEntry(i)
name = entry.getIntoNode().getName()
if name != "track_coll":
self.TrackCollideHandler(entry)
print name
