The problem is that the use of the loader from ShowBase itself is fundamentally wrong. Also note that the logic that can be executed many times in the __init __ area is also fundamentally wrong.
Your new bootloader might look like this.
file: ModelLoader.py
from panda3d.core import Loader, NodePath
class loadMyModel():
def __init__(self):
self.loader = Loader.get_global_ptr()
def load(self, model):
ob = self.loader.load_sync(model)
return NodePath(ob)
file: main.py
from direct.showbase.ShowBase import ShowBase
from ModelLoader import loadMyModel
class MyApp(ShowBase):
def __init__(self):
ShowBase.__init__(self)
load_my_model = loadMyModel()
self.panda = load_my_model.load("panda")
self.panda.setPos(0, 5, 0)
self.panda.reparentTo(render)
self.box = load_my_model.load("box")
self.box.setPos(0, -5, 0)
self.box.reparentTo(render)
app = MyApp()
app.run()