Questions tagged [fixed-timestep]
The fixed-timestep tag has no usage guidance.
1
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0answers
27 views
Keeping simulations in sync over long periods of time
I'm working on a multiplayer game which involves a huge amount of predictable AI enemies, and a few other players. The enemies are the most important to be accurate, because the game involves pixel ...
0
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1answer
42 views
Logic at a low framerate with interpolated rendering at higher framerate
It takes too much processing power to do game logic on every rendered frame (60fps), so what if I made my game save frames?
It would actually calculate important stuff 20 times a second, and the ...
2
votes
1answer
503 views
Render Stutter - OpenGL or loop timing?
For some time now i have no been able to pinpoint the nature of the rendering stutter shown above(by not clearing the screen, not using SwapBuffers and drawing only to the front buffer). See the big ...
1
vote
1answer
63 views
Fixed timestep on the server without hogging CPU?
It sounds backwards, but it's the situation I'm currently trying to solve on my dedicated server.
Everything I've read about fixed timestep assumed it was on a client, where you're already running in ...
0
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0answers
62 views
How do games have low tick rates without causing input lag?
For example, Minecraft. It updates the gamestate at a rate of only 20/second. And from what I've read, these multiplayer games do the same with their network communication, sending updates at that ...
0
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1answer
307 views
Unity3d physics stability with low fixed timestep
I'm developing a vehicle simulator game for mobile platforms. This vehicle has some hydraulic arms. I use hinge joints and configurable joints. There can be collisions to walls etc.
When I set a low ...
1
vote
1answer
177 views
How do I make my game (without performance problems) not stutter?
I've made a game that has gameticks every 1/60 seconds. These gameticks take very little time to calculate (< 0.5 ms).
The game is written in Javascript and uses requestAnimationFrame (rAF). rAF ...
1
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1answer
254 views
Is Time.deltaTime different on various devices?
Can someone say what is wrong with my code. I have custom timer implemented like this:
...
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0answers
75 views
Calculate TimeStep from FPS
If we collect fps of a game for each second of time stamp and collected them for n seconds therefore we have n number of fps values in our collection.
Then we can get average fps from that collection,
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1
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1answer
137 views
Timestep with multithreading
There are several questions and articles which deal with timestep - for example:
Should game logic update per second or per frame?
https://gafferongames.com/post/fix_your_timestep/
Accounting for ...
2
votes
1answer
194 views
How much do inconsistencies in update timing matter?
Yesterday I wrote my first game loop with fixed timesteps.
It is supposed to run every 50 ms, however it runs at 50-53 ms.
Does it matter?
I'm guessing no, but I figured I would ask anyway.
...
0
votes
1answer
1k views
Can I always assume that fixed time step in Unity is reliable?
I was thinking about games on low end machines or phones where the CPU would be limited. If I were to move all of my game logic into FixedUpdate() can I assume that ...
74
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5answers
11k views
What is the point of update independent rendering in a game loop?
There are dozens of articles, books and discussions out there on game loops. However, I pretty often come across something like this:
...
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2answers
868 views
Implementing “Fix Your Time Step”
So far I have this implementation of "FYTS".
However I am facing several problems.
...
0
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1answer
978 views
Box2d Fixed Timestep and Interpolation
I am using libGDX and I have problems implementing the box2d fixed timestep with interpolation.
This is my code:
...
0
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0answers
134 views
SFML game only runs smooth at high framerate (Windows 10)
I am trying to make my game smooth on low and high fps. Right now, it only runs smooth when I don't limit the framerate. If I run it at 60, then my sprite is noticeably "sluggish". I believe this ...
5
votes
2answers
469 views
Fixed timestep with interpolation & rounding draw positions: jerky animation when the character is not moving
I've implemented a deterministic, fixed timestep system from here:
http://gafferongames.com/game-physics/fix-your-timestep/
Everything works fine, output is the same with each step but there's one ...
1
vote
2answers
200 views
Game loop with fixed timestep gives strange result
So I've read the famous article at http://www.koonsolo.com/news/dewitters-gameloop/comment-page-2/#comments which describes different methods of implementing a game loop. I've tried to implement the ...
6
votes
2answers
498 views
Is it safe to base a combo system in frames instead of time?
I'm building a prototype for a fighting game (not vs, something like Final Fight). I'm trying to define the data for the player combo tree and had a look around looking for inspiration and have seen ...
0
votes
2answers
85 views
Running subsystems at difference update intervals
I want to update the rendering at 60fps, but the logic at some lower rate, say 15Hz. But if an object only moves when the game logic updates, then it would appear to stutter badly especially for lower ...
6
votes
1answer
323 views
Fixed Time Step Flutter
I've seen a lot of questions about this problem, but really no solution. Hopefully I can explain the issue well enough that I can get some sort of closure on this problem.
I'm using a Fixed Time ...
1
vote
0answers
62 views
Interpolate Entitiypositions received from Server
I want to Inter, or perhaps, extrapolate the positions of gameentities on the client. Those positions are received from the Server. The vague updaterate of the server makes it difficult to implement.
...
2
votes
1answer
347 views
Client and server loops don't match up
I'm trying to build a small networked game using WebGL and NodeJS. I have a basic client and server setup and I'm at the point where I'm trying to implement dead reckoning to simulate what happens on ...
0
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1answer
58 views
Does fixed time step deltaTime get higher if the computer can't handle it?
If you use fixed time step and set it to for example 0.0166667 does it ever go up if the computer can't handle 60 updates/ticks per second?
12
votes
4answers
4k views
How often do big MMORPG update the physics? [closed]
As far as I understand, most big games use fixed timestep to have a stable simulation.
Regarding the game server, which "frame rate" do they impose? Or said it another way, what fixed timestep do ...
1
vote
2answers
331 views
Using fixed timestep and interpolating states makes physics fall behind one frame. Does that affect responsiveness?
The title says it all, but let me build more into the question:
I suppose everyone by now knows the Fix Your Timestep article, and its proposal to free your physics engine steps from your rendering ...
0
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0answers
217 views
Why does physics interpolation give me periodic jumps/flickers?
I have seen this question but it didn't solve the problem.
I have followed the same steps as in this article.
What I notice in my Android game is that my interpolation alpha (or fraction or ...
2
votes
1answer
866 views
Problem with update/render in game loop (scrolling view, render interpolation)
I use SFML 2.2 and program a 2d prototype game (2d mario style where the camera follows the player).
I am experiencing the buggy imagery during rendering, for example a chunk of vertex array blocks ...
2
votes
4answers
1k views
Android Game-Loop (rendering & logic removed, but still 'skipping frames')
Overview
Guys really hoping for some help here. My game loop is based on code from Fix Your Timestep!.
I've read the article more than a few times, but I can't quite work out what exactly is ...
0
votes
3answers
139 views
What is the best way to keep track of time in a game?
I'm getting to the part in development where I'm noticing that timing is going to be an issue.
If I put my movement update in the same function where I draw the scene, then a low FPS means slower ...
0
votes
1answer
2k views
Explain the difference between extrapolation and interpolation
http://www.unagames.com/blog/daniele/2010/06/fixed-time-step-implementation-box2d here there are two algorithms of smoothing in case of fixed time step physics simulation. I don't understand the ...
0
votes
1answer
302 views
Trying to understand the XNA fixed time step game loop logic
I came across the blog post Understanding GameTime, and after lots of reading on fixed time steps in game loops this is the approach I would like to take. In summary, this is the logic from the post:
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3
votes
1answer
331 views
Fixed timestep and interpolation question
I'm following Glenn Fiedlers excellent Fix Your Timestep! tutorial to step my 2D game. The problem I'm facing is in the interpolation phase in the end.
My game has a Tween-function which lets me ...
3
votes
1answer
251 views
Game loop in Javascript
I've been into javascript game programming with html5 and canvas lately. So far I've only been able to implement a game loop with setInterval, but I'm aware this means using fixed timestep. I've ...
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3answers
180 views
Getting sprites to move exactly the same on different devices
Background
When moving a sprite along the X axis, this is my code:
...
3
votes
1answer
1k views
Does client side prediction sync with the server in the past?
I've spent some time now messing around and just trying to learn dead reckoning and client side prediction for the fun of it. Most of what I do doesn't need it, so i've never had a need to go down ...
-1
votes
1answer
507 views
why are there draw rate and update rate in fixed time step game loop?
http://www.gameprogblog.com/generic-game-loop/
Java
...
2
votes
1answer
283 views
Calculate Distance Using Lifetime, Speed, and Time Between Ticks
I am trying to draw a line from the player to where he is facing, with the line being the distance his rockets will travel. I have ShipMissile.Speed, which is the number of pixels to move per tick, ...
1
vote
2answers
789 views
Smooth animation when using fixed time step
I'm trying to implement the game loop where the physics is independent from rendering but my animation isn't as smooth as I would like it to be and it seems to periodically jump. Here is my code:
<...
2
votes
1answer
396 views
Implementing a time scale in game with fixed physics update
I'm currently putting together my game loop based on the "Fix Your Timestep" article at gafferongames.com. This is going fine, but I'm also trying to implement a 'time scale', i.e. a way to control ...
0
votes
2answers
235 views
Serious gameplay issue by spawning enemies according to elapsed time
EDIT: I have changed the title as I think that this is a general gamedevelopment question but, on a technical note, I am using Cocos2d v2.0
Some time ago I had asked a question on which was the most ...
6
votes
2answers
6k 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 ...
-1
votes
1answer
333 views
Server fixed timestep not running at 30Hz but way way too fast [closed]
I'm trying to make my game's server thread run at a fixed 30Hz but can't figure out how. Basically, before I just had a stupid while(1) { //do everything as fast as you can} which means that for my ...
0
votes
2answers
573 views
What is XNA's GameTime used for?
I'm developing a game using fixed time step, and so far I haven't been using XNA's GameTime class in my code. What uses does the class have, and should I definitely use it in my game, or can I ignore ...
3
votes
3answers
938 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 ...
5
votes
2answers
482 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, ...
4
votes
3answers
994 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:
...
1
vote
1answer
684 views
default xna 4.0 gametime don´t works well for 2D physics
I am developing a game using Visual Studio 2010 and XNA 4.0,
after advancing to some extent with the project (a platform based 2d platformer msdn starter kit) I got to test it on different computers ...
7
votes
2answers
1k 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:
...
5
votes
4answers
3k 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 ...
