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.. _physics:

Physics
=======

Panda3D offers four built-in choices to use for Physics:

-  :ref:`panda's-built-in-physics-engine`: Panda3D has a very basic physics
   engine built-in that may apply forces to classes. The physics engine can
   handle angular or linear forces, as well as viscosity.
-  :ref:`the-open-dynamics-engine`: This is a more extended physics engine
   that Panda3D offers good integration for, you will want to use this if you
   need more complex physics simulations. In Panda3D versions 1.5.3 and above,
   this is integrated in the binaries from the download page.
-  NVIDIA PhysX: New in 1.7.0. Not yet documented.
-  \ `Bullet Physics
   Engine <http://www.panda3d.org/manual/index.php/Using_Bullet_with_Panda3D>`__\ :
   New in 1.8.0.

When you have a very simple simulation, you will most likely want to use the
built-in physics, which works with Panda's collision system. Although, when
the built-in engine doesn't offer enough functionality for you, you can switch
to ODE, Bullet or PhysX.

Integration for various other physics engines have been provided by the
community on the forums:

-  Old wrappers for AGEIA PhysX:
   https://www.panda3d.org/forums/viewtopic.php?t=3108
-  More recent wrappers:
   https://www.panda3d.org/forums/viewtopic.php?p=27906#27906
-  Most recent wrappers: https://www.panda3d.org/forums/viewtopic.php?t=5067
-  Wrappers for Newton Game Dynamics:
   https://www.panda3d.org/forums/viewtopic.php?t=2617