The fixed-timestep tag has no wiki summary.
18
votes
6answers
1k views
Data structures for interpolation and threading?
I've been dealing with some frame-rate jittering issues with my game lately, and it seems that the best solution would be the one suggested by Glenn Fiedler (Gaffer on Games) in the classic Fix Your ...
17
votes
2answers
2k views
How to Interpolate between two game states?
What is the best pattern to create a system that all the objects positions to be interpolated between two update states?
The update will always run at the same frequency, but I want to be able to ...
8
votes
1answer
737 views
Separating logic/update from render/drawing code in a single thread using sleep
I've read that the speed of game objects should not be hindered by FPS but instead should be based on time. How can I seperate the update/draw code to maximize performance without limiting the drawing ...
6
votes
1answer
473 views
Mitigating the noticability of a frame drop in XNA
I have been having some minor frame drop issues in a 2D XNA game.
To start with, I am a vsync'ed, mixed timestep. That is:
IsFixedTimestep = false;
...
4
votes
2answers
338 views
What is the point in using real time?
I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time.
...
4
votes
3answers
941 views
Still confused about timesteps in XNA
I have been reading many different posts and articles about timesteps and while I now understand that fixed timesteps are generally considered superior, I'm having a bit of difficulty implementing one ...
4
votes
3answers
440 views
Simple speed deceleration with variable time step?
When you use a fixed time step you can call speed=speed*0.95 to emulate speed deceleration in a simple way.
I want to do the same thing with variable time step.
I wish to have a simple function ...
4
votes
4answers
842 views
Physics timestep questions
I've got a projectile working perfectly using the code below:
//initialised in loading screen
60 is the FPS - projectilEposition and velocity are Vector3 types
gravity = new Vector3(0, ...
3
votes
3answers
248 views
How precise should timers in update loops be?
What is the suggestion of "enough precision" in a timer for a fixed game update loop?
Currently I'm testing with this code, but it sometimes misses 1-2 updates @ 50hz. While at 30hz it seems to work ...
3
votes
2answers
953 views
Why does my position interpolation code result in “jumpy” motion?
I am developing an android game with box2d and use a fixed timestep system for advancing the physics.
However as I use this system it requires the box2d positions to be interpolates. I read this ...
3
votes
2answers
278 views
How to achieve smooth movement with a fixed timestep
Previously in the update method of my game I was using a variable time step which provided very smooth movement of a player sprite except when the frame rate would drop, even slightly. At that point I ...
3
votes
3answers
220 views
Semi Fixed-timestep ported to javascript
In Gaffer's "Fix Your Timestep!" article, the author explains how to free your physics' loop from the paint one.
Here is the final code, written in C:
double t = 0.0;
const double dt = 0.01;
double ...
2
votes
2answers
253 views
For timed levels, how do you determine time steps that are less than 1/(frames per second)?
I have made a simple HTML5 racing game. The laps are timed. I am running the game are 40 frames per second, each frame represents 40 milliseconds. There for my timer will increase in 0.025 ...
2
votes
1answer
2k views
in iOS, does CADisplayLink automatically control the app's 'timestep'?
I'm writing an iOS game that uses OpenGL ES 2.0. I have my 'OpenGLView' which contains a
- (void)setupDisplayLink {
CADisplayLink* displayLink = [CADisplayLink displayLinkWithTarget:self ...
1
vote
2answers
397 views
Variable physics step, bad idea?
Currently, when I update the entities I calculate the time passed since the last update, and then pass that to their update function. They will in turn pass that duration to all their components.
...
