def __init__(self):
# start Panda3d
base = ShowBase()
# CollisionTraverser instance must be attached to base,
# and must be called cTrav
base.cTrav = CollisionTraverser()
self.cHand = CollisionHandlerEvent()
self.cHand.addInPattern('into-%in')
# load smiley, which we will control
# notice this is a little trickery. If we parent everything except smiley
# to the camera, and the player is controlling the camera, then everything
# stays fixed in the same place relative to the camera, and when the camera
# moves, the player is given the illusion that he is moving smiley, rather than
# the camera and the rest of the scene.
self.smiley = base.loader.loadModel('smiley')
self.smiley.reparentTo(render)
self.smiley.setName('Smiley')
# Setup a collision solid for this model. Our initCollisionSphere method returns
# the cNodepath and the string representing it. We will use the cNodepath for
# adding to the traverser, and the string to accept it for event handling.
#sColl = self.initCollisionSphere(self.smiley)
sColl = self.initCollisionSphere(self.smiley, True)
print 'smiley', sColl[0]
print 'smiley', sColl[1]
# Add this object to the traverser.
base.cTrav.addCollider(sColl[0], self.cHand)
# load frowney
self.frowney = base.loader.loadModel('frowney')
self.frowney.setName('Frowney')
self.frowney.reparentTo(camera)
# Setup a collision solid for this model.
fColl = self.initCollisionSphere(self.frowney, True)
#print 'frowney', fColl[0]
#print 'frowney', fColl[1]
# Add this object to the traverser.
base.cTrav.addCollider(fColl[0], self.cHand)
# Accept the events sent by the collisions.
# smiley is the object we are 'moving', so by convention
# it is the from object.
# If we instead put smiley as the into object here,
# it would work fine, but then smiley would disappear
# when we collided them.
self.accept('into-' + fColl[1], self.collide)
# set the initial positions of smiley and frowney
self.set_initial_positions()
snipstuff.info.append("Simple Mouse Picking")
snipstuff.info.append("a minimal sample to show a simple collision setup for picking an object with the mouse pointer")
snipstuff.info.append("move the mouse pointer over the smiley to see it change color and click LMB to see a reaction.\n")
snipstuff.info_show()
base.disableMouse()
#=========================================================================
# Main
"""
To biefly sum up what happen below, we create 2 interacting objects: a FROM object, an invisible collision ray, and a INTO object, smiley. The FROM will generate collision events as soon as touch the INTO object moving the mouse pointer over it.
"""
#=========================================================================
#** we settle the collision events as ususal
base.cTrav=CollisionTraverser()
collisionHandler = CollisionHandlerEvent()
#** Differently from the previous steps, we change here a little bit our main FROM collider,
# using now a strange kind of geometry: a ray - you may see it as a laser ray the constantly
# shoot from the camera lenses toward the infinite. The following lines will settle up all of this.
pickerNode=CollisionNode('mouseraycnode')
pickerNP=base.camera.attachNewNode(pickerNode)
pickerRay=CollisionRay()
pickerNode.addSolid(pickerRay)
base.cTrav.addCollider(pickerNP, collisionHandler)
#** Here we make our same old smiley as we saw many times so far
smileyModel = loader.loadModel('smiley')
smileyModel.reparentTo(render)
