Pause Physics

[gamecreator]

I hope I didn't miss it on the wiki but is there a way to pause physics but keep everything else going (like mouse picking, etc.)? I thought PauseApp might work but the physics keep moving. I'm using Framework.

[Road Kill Kenny]

I don't know if there is an "official" way to do this... Maybe cycling through all bodies and setting the mass to 0 on pause and then, setting them back to their normal values after pause..... This is just a guess. I have no idea if it will work.

 

Perhaps try this -

On Pause:

1. Record all Velocities & Omegas.

2. Set Velocities & Omegas to 0.

3. Turn off Gravity

 

On UnPause:

1. Set the Velocities, Omegas back to normal.

2. Turn on Gravity

 

Neway it sounds like a messy way to do it but I guess it could work.

 

Dadonik was trying to pause physics recently. Not sure how far he got with it.

[Marleys Ghost]

PauseApp() pauses the application time. Make sure when you are "doing things" whilst "paused" not to update the Apptime.

 

http://www.leadwerks.com/werkspace/topic/2591-how-to-pause-game/page__view__findpost__p__23849

[paramecij]

I simply use:

// dt = AppSpeed
// time_scale = 0.0 - halt, 0.5 half, 1.0 normal, 2.0 double speed ...
UpdateWorld( dt * time_scale );

.. it does the trick and more, but you are using Framework, so try and replace UpdateFramework() with calls to UpdateWorld (for all 3 world layers) and don't forget to add UpdateAppTime() in there somewhere, but i'm not sure what else UpdateFramework() does, so this might not be an option..

[DaDonik]

I wrote my own framework and i managed to pause the physics without any memory leak or other problems.

 

 UpdateAppTime();
   if (m_bIsPaused == true)
   {
    // Update each world with a stepsize of 0 -> paused mode
    LE2LayerPtrMapIt it = m_mapLayers.begin();
    for (; it != m_mapLayers.end(); ++it)
    {
	    if ((*it).second != NULL)
	    {		   
		    (*it).second->SetThisWorld();
		    UpdateWorld(0);
	    }
    }
   }
   else
   {
    // Update each world with a stepsize of AppSpeed -> running
    LE2LayerPtrMapIt it = m_mapLayers.begin();
    for (; it != m_mapLayers.end(); ++it)
    {
	    if ((*it).second != NULL)
	    {		   
		    (*it).second->SetThisWorld();
		    UpdateWorld(AppSpeed());
	    }
    }
   }

 

The "problem" here is that the game is still running and callbacks are still called. So it really just pauses the physics.

[Road Kill Kenny]

Perhaps you could set a trigger in the callbacks that causes them to not do anything if the game is in a paused state.

 

Just an idea