Successive Calls to MeshDrawer.set_budget Create Dead GeomNodes

[Jonathan Kelly]

At least on Windows 7 using Panda3D versions from 1.9.1 to 1.9.3, each call to set_budget() of MeshDrawer causes it to abandon its original GeomNode and create a new one without removing the original from the drawer's NodePath. This means resetting the budget higher or lower as needed will quietly create dead GeomNodes that build up until explicitly removed.

Forum Topic: http://www.panda3d.org/forums/viewtopic.php?f=4&t=19307

Example Code:

from direct.showbase.ShowBase import ShowBase
from panda3d.core import MeshDrawer, NodePath

class Test(ShowBase):

    def __init__(self):
        ShowBase.__init__(self)
        self.drawer = MeshDrawer()
        self.drawer_node = self.drawer.get_root()
        self.drawer_node.reparent_to(render)
        self.drawer_node.set_two_sided(True)
        self.drawer_node.set_pos(0, 100, 0)
        self.drawer.set_budget(512)
        self.time = 0
        taskMgr.add(self.update_task, 'universe')

    def update_task(self, task):
        self.time += globalClock.get_dt()
        self.drawer.begin(camera, render)

        # Test that setting budget does not increase number of geomnodes.
        # At least on Windows 7 it adds a new GeomNode with each call,
        # without deleting the old one.
        self.drawer.set_budget(512)
        print '# of geoms- ', self.drawer_node.get_children().get_num_paths()

        self.drawer.end()
        return task.cont

test = Test()
test.run()

[rdb (rdb)]

Thank you. This is now fixed; set_budget() reuses the existing GeomNode.