Problem setting camera position

I’m new to Panda3D and Python. I’ve been fiddling around with the examples and have modified the first one to add some spinning blocks and user-controlled camera movement. However, when I run the code below the camera flickers between what seems to be the origin and the desired position when a key is pressed. What am I doing wrong?

Also, not sure if creating an object to handle keyboard input in this way is a good idea… what’s the usual set up?



import sys
from direct.showbase import DirectObject
from random import randint
from math import pi, sin, cos 
from direct.showbase.ShowBase import ShowBase
from direct.task import Task
# 'constants'

class Block():
    def __init__(self):
        self.model = loader.loadModel("lump.x")   
        self.model.setPos(randint(-8, 8), randint(-8, 8), 1)
        self.rotation = randint(0, 359)
        if randint(1, 2) == 2:
   = randint(1, 3)
   = randint(-3, -1)
class ReadKeys(DirectObject.DirectObject):
    def __init__(self):
        self.accept('arrow_up-repeat', self.moveCameraUp)
        self.accept('arrow_down-repeat', self.moveCameraDown)
        self.accept('escape', sys.exit) 
    def moveCameraUp(time):        
    def moveCameraDown(time):        
class MyApp(ShowBase):
    def __init__(self):
        r = ReadKeys()

        # load scenery
        self.scene = self.loader.loadModel("models/environment")
        self.scene.setScale(0.25, 0.25, 0.25)
        self.scene.setPos(-8, 42, 0)
        # create random blocks
        self.blocks = []
        for i in range(0, NUM_BLOCKS):

        # set up task to spin blocks
        self.taskMgr.add(self.spinBlocksTask, "SpinBlocks")
        # set up camera
        self.cameraX = 0.0
        self.cameraY = -20.0
        self.cameraZ = 3.0, self.cameraY, self.cameraZ) 
    def cameraDown(self):
        self.cameraZ -= 0.1, self.cameraY, self.cameraZ)

    def cameraUp(self):
        self.cameraZ += 0.1, self.cameraY, self.cameraZ)      
    def spinBlocksTask(self, task):
        for i in range(0, NUM_BLOCKS):
            self.blocks[i].rotation += self.blocks[i].delta
            self.blocks[i].model.setHpr(0, 90, self.blocks[i].rotation)
        return Task.cont        
app = MyApp()

From I worked out that it was the mouse controlled camera causing the issue. Grrrrrr.

I read more of that excellent tut and maybe discover the best way to set up input handling - thanks Thaumaturge!

It’s my pleasure, and I’m very glad that it helped! I hope that you enjoy the rest of the tutorial, and that it too proves useful. :slight_smile:

I propose to disable the default camera in the next version and add a way to enable it in the tutorial. This should solve this eternal problem.

I’d love to see the internal camera-control be disabled by default! (And I do think that it has been proposed.) Perhaps we’ll see such a change in a subsequent version of the engine.