Time.timeScale and Time.fixedDeltaTime

Questions & Answers
1

I’m making a quick menu for my game, when it pops up the game time slows down to 10% normal speed while you do your quick menu stuff. then time speeds back up to 100% when you let off the button. but the scripting reference says i also need to drop down the fixedDeltaTime. but I’m not sure how to do it.

this is what i have currently, it works well enough that i don’t notice any messed up physics, but i have no idea what its doing.

function actionMenu()
{
	if (Input.GetButtonDown("ActionMenu"))
	{
		Time.timeScale = 0.1;
		Time.fixedDeltaTime *= .1;
	}
	if(Input.GetButtonUp("ActionMenu"))
	{
		Time.timeScale = 1.0;
		Time.fixedDeltaTime /= .1;
	}
}

in the script reference, the example they give is:

// Adjust fixed delta time according to timescale
// The fixed delta time will now be 0.02 frames per real-time second
Time.fixedDeltaTime = 0.02 * Time.timeScale;

i understand the " * Time.timeScale" part but what is the 0.02?

2

It’s your desired physics time step. By default the physics frame rate is 50 fps. 1/50 = 0.02

You can run the FixedUpdate at any rate you like (and your PC/device supports) but usually 50 is OK.