Clicking on objects?

Scripting Issues
1

Hi there.

I found the page in the manual about clicking on 3d objects, but when I try to implement it, it says that myTraverser is not defined. I know how to define variables, but what would I type for this one? I don’t know what type it is.

Thanks

2

Well, until you post the code, it’s hard to guess. Probably, you didn’t define the collision traverser… :wink:
This answer doesn’t help, I know. Try to search forums. There are numerous examples here how to click on 3d objects. You can compare them with your code, and find the missing part.

3

Ok so here is my code so far. All the commented out parts I just added to make it run like it used to. I am sure I can improve on this a lot, but this is still a learning process.

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

from direct.task import Task
from direct.actor import Actor
from direct.interval.IntervalGlobal import *
from pandac.PandaModules import CollisionTraverser,CollisionNode
from pandac.PandaModules import CollisionHandlerQueue,CollisionRay
import math

##pickerNode=CollisionNode('mouseRay')
##pickerNP=camera.attachNewNode(pickerNode)
##pickerNode.setFromCollideMask(GeomNode.getDefaultCollideMask())
##pickerRay=CollisionRay()
##pickerNode.addSolid(pickerRay)
##myTraverser.addCollider(pickerNP, myHandler)

def planets():
  Lava = loader.loadModel("Models/Lava planet")
  Lava.reparentTo(render)
  Lava.setPos(0,0,0)
  Lava.setHpr(0,0,0)
  spin1 = Lava.hprInterval(duration=10, hpr=VBase3(360, 0, 0)) 
  spin1.loop()
  Lava.setShaderAuto()
  #Lava.setTag('Planet', 1)

  Ice = loader.loadModel("Models/Ice planet")
  Ice.reparentTo(render)
  Ice.setPos(3,-6,0)
  Ice.setHpr(0,0,0)
  Ice.setScale(1.5,1.5,1.5)
  spin2 = Ice.hprInterval(duration=15, hpr=VBase3(360, 0, 0)) 
  spin2.loop()
  Ice.setShaderAuto()
  #Ice.setTag('Planet', 2)

  Poison = loader.loadModel("Models/Poison planet")
  Poison.reparentTo(render)
  Poison.setPos(-4,-5,0)
  Poison.setHpr(0,0,0)
  Poison.setScale(0.8,0.8,0.8)
  spin3 = Poison.hprInterval(duration=6, hpr=VBase3(360, 0, 0)) 
  spin3.loop()
  Poison.setShaderAuto()
  #Poison.setTag('Planet', 3)

##def Pickobject():
##   mpos=base.mouseWatcherNode.getMouse()
##   pickerRay.setFromLens(base.camNode, mpos.getX(), mpos.getY())
##
##   myTraverser.traverse(render)
##   #assume for simplicity's sake that myHandler is a CollisionHandlerQueue
##   if myHandler.getNumEntries() > 0:
##      myHandler.sortEntries() #this is so we get the closest object
##      pickedObj=myHandler.getEntry(0).getIntoNodePath()
##      pickedObj=pickedObj.findNetTag('Planet')
##      if not pickedObj.isEmpty():
##         handlePickedObject(pickedObj)

sky = loader.loadModel("Models/Star plane")
sky.reparentTo(render)
sky.setPos(0,0,-10)
sky.setHpr(0,30,0)

directionalLight = DirectionalLight( "directionalLight" )
directionalLightNP = render.attachNewNode( directionalLight.upcastToPandaNode() )
directionalLightNP.setHpr(65,-45,0)
render.setLight(directionalLightNP)

dlight = DirectionalLight('dlight')
dlnp = render.attachNewNode(dlight)
dlnp.lookAt(sky)
sky.setLight(dlnp)

def Camera(task):
  base.camera.setPos(0,-20,30)
  base.camera.setHpr(0,-60, 0)
  return Task.cont

taskMgr.add(Camera, "Camera")

planets()

run()
4

You didn’t define collision traverser in your code (what is “myTraverser”? Your Python doesn’t know it). And I believe you need to read manual, mate :slight_smile: It is very helpful: Collision Traversers

5

So then what would I put in for ‘traverser name’? Or does it not matter?
And then the from object would just be what I’m clicking on?

6

what he means is.
you havent created the object named “myTraverser”. which is supposed to be a collision-traverser instance in yourcase.
so basically its like you try to do “print x” but you didnt define x yet. so python doesnt know what x is. same here. it does not know what myTraverser is supposed to be. so unless you create it, it wont work.

putting

 myTraverser = CollisionTraverser()

in front of your first myTraverser.something() call should do the trick

7

Ok it works now, so now I just need to make it do something. Thanks.