Game loops!

[_Scyth_]

What is the interpolation used for?

[ra4king]

Wut?

[Eli Delventhal]

Post that again when you're not the top of the page.

It's used for having fluidness beyond the speed of either your logic or frame updates. Generally, your FPS is going to be quite variable, so you need to calculate exactly how much you want to move things based on how fast or slow the last update was. In variable timestep, you need to interpolate the logic because it is able to run at any speed. In the case of a fixed timestep, you need to interpolate the drawing, because the logic is locked into a certain speed but the drawing is not.

Games published by our own members! Check 'em out!

[Damocles]

Loops and Things:

https://www.youtube.com/watch?feature=player_embedded&v=v9funsyB-XM

[fictiongame]

Like the article and the thread very much, because this is what I have been looking for.
I am a newbie in game development.
From the beginning, I had questions about loop: I was wondering how accurate it would be, and what will happen if one loop is delayed, and how to synchronize between different computers.

Anyway, here is some of my questions:
(1) It seems sleep and timer is not recommended due to their low accuracy. But they do not cost CPU, right?
In "Fixed timestep" example code of the first post, it seems it uses while loop comparing the current time to the desired time point. It is time consuming, but it is claimed by OP that it is more accurate.

Is my above understanding correct?

(2) Regarding OP's "Fixed timestep",

Update is irrelated to the variable time. So what matters is the times of updates.
But render is designed to be dependent on lastUpdateTime.
I do not understand why. I mean, it seems not make sense here.

Thanks again for OP's article!