Bullet update loop.

[3DModelerMan]

Hey, I decided not to use Havok, and to use Bullet instead. But I have a question.

Code: Select all

driver->beginScene(true, true, SColor(255,100,101,140));
 
 smgr->drawAll();
 guienv->drawAll();
 
 driver->endScene();  
  
 //Update physics.                
 m_DynamicsWorld->stepSimulation(1/60.f,10);

Should I update the physics before, after, or in between the beginScene() and endScene() calls? And if it should be in between, then should it be before or after the drawAll() call?

[randomMesh]

The main loop of my application looks like this:

Code: Select all

	irr::IrrlichtDevice* const device = game.getDevice();
	btDiscreteDynamicsWorld* const dynamicsWorld = game.getPhysics()->getWorld();

	while (device->run())
	{
		if (device->isWindowActive())
		{
			//update game timer
			game.tick();

			//update the state machine (aka rendering and event receiving)
			game.onUpdate();

			//update physics
			dynamicsWorld->stepSimulation(game.getElapsed(), 10);
		}
		else
			device->yield();
	}

[squisher]

There's no reason for it to be in between.
The beginScene and endScene methods are only necessary to house the rendering code. (all the draw* methods)

Doesn't matter whether you put the stepSimulation before after the begin-end block.

[Jookia]

You generally should draw stuff AFTER you update the position.

[3DModelerMan]

Yeah, good point. You could probably get hacked in motion blur if you updated after though.

[Jookia]

Or if you stored the current position of crap before you update physics and then use that infro to draw the blur.