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Physics (PhysX)

Disable physics

By default, physics (and the PhysX physics engine) is enabled in TDW.

It is possible to disable physics by sending simulate_physics:

from tdw.controller import Controller
from tdw.tdw_utils import TDWUtils
from tdw.add_ons.third_person_camera import ThirdPersonCamera

c = Controller()
camera = ThirdPersonCamera(position={"x": -3, "y": 2.1, "z": 0.5},
                           look_at={"x": 0, "y": 0, "z": 0})
c.add_ons.append(camera)
commands = [TDWUtils.create_empty_room(12, 12),
            {"$type": "simulate_physics",
             "value": False}]
commands.extend(c.get_add_physics_object(model_name="iron_box",
                                         object_id=c.get_unique_id(),
                                         position={"x": 0, "y": 1, "z": 0}))
c.communicate(commands)

# The model will hang in mid-air.
for i in range(200):
    c.communicate([])
c.communicate({"$type": "terminate"})

Typically, users want to disable physics if they are setting up a scene that involves image capture but not physics.

Besides the obvious (objects won't move due to physics), there are some other effects of disabling physics:

  1. Collision detection is disabled.
  2. Raycasts and overlaps won't work.

This is the last document in the "Physics (PhysX)" tutorial.

Return to the README

Command API: