A simple scripting problem

Scripting Issues
1

I’m new to panda3D, and python in general (i have a ton of experience in java and so far learning hasnt proven to be all that difficult). I was following the beginning tutorial, and I was grasping things pretty well, I was able to get the camera to rotate around the scene, and make the panda walk in place. then I added the function to make the panda walk back and forth, and apparently something I did broke it. Can someone please tell me what I did wrong?

from math import pi, sin, cos

from direct.showbase.ShowBase import ShowBase
from direct.task import Task
from direct.actor.Actor import Actor
from direct.interval.IntervalGlobal import Sequence
from panda3d.core import Point3

class MyApp(ShowBase):
    def __init__(self):
         ShowBase.__init__(self)
    
         
         #self.disableMouse()
         #disables mouse controls
         
         self.environ = self.loader.loadModel("models/environment")
         #self.axis = self.loader.loadModel("models/zup-axis") 
         
         self.environ.reparentTo(self.render)
         #self.axis.reparentTo(self.render) 
    
         self.environ.setScale(0.25, 0.25, 0.25)
         self.environ.setPos(-8, 42, 0)
         #self.axis.setScale(0.25, 0.25, 0.25)        
         #self.axis.setPos(0, 0, 1)  
         
         self.taskMgr.add(self.spinCameraTask, "SpinCameraTask")  
         
         
         self.pandaActor = Actor ("models/panda-model",
                                  {"walk":  "models/panda-walk4"})
         self.pandaActor.setScale(0.005, 0.005, 0.005)
         self.pandaActor.reparentTo(self.render)
         self.pandaActor.loop("walk")
         
         
         
         pandaPosInterval1 = self.pandaActor.posInterval(13,
                                                         Point3(0, -10, 0),
                                                         startPos = Point3(0, 10, 0))
         
         pandaPosInterval2 = self.pandaActor.posInterval(13,
                                                         Point3(0, 10, 0),
                                                         startPos = Point3(0, -10, 0))
         
         pandaHprInterval1 = self.pandaActor.hprInterval(3,
                                                         Point3(180, 0, 0),
                                                         startPos = Point3(0, 0, 0))
                                                         
         pandaHprInterval2 = self.pandaActor.hprInterval(3,
                                                         Point3(0, 0, 0),
                                                         startPos = Point3(0, 0, 0))
         self.pandaPace = Sequence(pandaPosInterval1,
                                   pandaPosInterval2,
                                   pandaHprInterval1,
                                   pandaHprInterval2,
                                   name="pandaPace")
                                   
         self.pandaPace.loop()
                                                         
                                                      
                                                         
def spinCameraTask(self,task):
        angleDegrees = task.time * 6.0
        angleRadians = angleDegrees * (pi / 180.0)
        self.camera.setPos(20 * sin(angleRadians), -20.0 * cos(angleRadians), 3)
        self.camera.setHpr(angleDegrees, 0, 0)
        return Task.cont
    


app = MyApp()
app.run()
2

Can you post specifically what the problem is? It is hard to know what you mean when you say “broke”.

I am going to throw a wild guess and say that the problem is likely that the spinCameraTask function is not indented under the MyApp class. Indentation is part of Python’s syntax and this is a common mistake made by beginners to Python.

3

yeah, sorry for not posting the issue :confused: in the example it wasnt indented, ill go check if indenting it fixes the issue. thanks!

4

nope, still dosent work. the error is
“AttributeError: MyApp instance has no attribute ‘spinCameraTask’”

5

Hi, the following works for me: (even though the panda moonwalks practically, but that’s your logic problem)

from math import pi, sin, cos 

from direct.showbase.ShowBase import ShowBase 
from direct.task import Task 
from direct.actor.Actor import Actor 
from direct.interval.IntervalGlobal import Sequence 
from panda3d.core import Point3 

class MyApp(ShowBase):
	def __init__(self): 
		ShowBase.__init__(self) 
		#self.disableMouse() 
		#disables mouse controls 

		self.environ = self.loader.loadModel("models/environment") 
		#self.axis = self.loader.loadModel("models/zup-axis") 

		self.environ.reparentTo(self.render) 
		#self.axis.reparentTo(self.render) 

		self.environ.setScale(0.25, 0.25, 0.25) 
		self.environ.setPos(-8, 42, 0) 
		#self.axis.setScale(0.25, 0.25, 0.25)        
		#self.axis.setPos(0, 0, 1)  

		self.taskMgr.add(self.spinCameraTask, "SpinCameraTask")  


		self.pandaActor = Actor ("models/panda-model", 
					          {"walk":  "models/panda-walk4"}) 
		self.pandaActor.setScale(0.005, 0.005, 0.005) 
		self.pandaActor.reparentTo(self.render) 
		self.pandaActor.loop("walk") 

		pandaPosInterval1 = self.pandaActor.posInterval(13, 
														Point3(0, -10, 0), 
														startPos = Point3(0, 10, 0)) 

		pandaPosInterval2 = self.pandaActor.posInterval(13, 
														Point3(0, 10, 0), 
														startPos = Point3(0, -10, 0)) 

		pandaHprInterval1 = self.pandaActor.hprInterval(3, 
														Point3(180, 0, 0), 
														startHpr = Point3(0, 0, 0)) 

		pandaHprInterval2 = self.pandaActor.hprInterval(3, 
														Point3(0, 0, 0), 
														startHpr = Point3(0, 0, 0)) 
		self.pandaPace = Sequence(pandaPosInterval1, 
													pandaPosInterval2, 
													pandaHprInterval1, 
													pandaHprInterval2, 
													name="pandaPace") 

		self.pandaPace.loop() 

	def spinCameraTask(self,task): 
		angleDegrees = task.time * 6.0 
		angleRadians = angleDegrees * (pi / 180.0) 
		self.camera.setPos(20 * sin(angleRadians), -20.0 * cos(angleRadians), 3) 
		self.camera.setHpr(angleDegrees, 0, 0) 
		return Task.cont 

app = MyApp()
app.run()
6

thanks! Fixing the panda should be easy.