Cant find bullet tick callback in panda 3d

General Discussion
1

Hi. enjoying Panda3d a bunch.

Am using the bullet integration, but one thing I can’t find is the tick callback function.

Now I know I am probably just not looking on the right place, but I’d find this functionality very useful in moderating max speed etc on my geometry.

see what i am talking about more coherently here…

bulletphysics.org/mediawiki-1.5.8/index.php/Simulation_Tick_Callbacks

2

You don’t find it because we don’t have this callback exposed. You can set it from C++ though. From Python it does not make much sense. In particular since from Python everybody uses variable timesteps, and thus framerate independences is limited anyway.

3

For those who really want to mess around with tick callbacks: I have added it in the current snapshot builds.

You can have a different callback set for each world. This is how to set a callback.

  o = PythonCallbackObject(self.func)
  self.world.setTickCallback(o)

Of course you need to implement a callback too. The callback data has only one parameter, the timestep.

def func(self, data):
  timestep = data.getTimestep()
  ... do something ...