How do I set my physics object in game to work with different framerates / refresh rates?

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- make_randelin
- - Joined 2 Mar, 2021
  - 2 topics • 3 posts
- 1
- 25 Mar, 2021
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Hello all! My first post in the forums.

I have been having problems with physics behavior and I have tried several ways to fix this but nothing is giving me even decent results.
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The problem is that physics object is going slower on smaller framerates (even with 60fps). The difference is so big that the game is not enjoyable or well balanced on different devices.

I'm pretty sure that there is no good solution for this, but I wanna ask first before scrapping the whole idea down. I have tried different stepping modes already.

If I can't fix this, is there any good way to fake physics for this kind of feature (throwing ball like objects that doesn't bounce super much)? I tried to play around with bullet behavior but the results were not good at all.

Thanks in advance!
Tagged:

framerate
physics
physics-behavior
refresh-rate
- dop2000
- - Joined 26 May, 2016
  - 139 topics • 12,609 posts
- 1
- 26 Mar, 2021
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Have you tried "Physics Set Stepping Mode" setting?

Choose whether the Physics time step uses dt (delta time, for Framerate independent) or a fixed value. By default it uses delta time to ensure physics progresses at a regular speed on displays with different refresh rates. However in some circumstances this can produce non-deterministic results, and note the Physics behavior clamps the maximum time step to 1/30 (about 33ms, equivalent to 30 FPS) to prevent the instability that can result from large time steps. Set to Fixed to always use a time step of 1/60 (about 16ms) regardless of the framerate, which makes the simulation deterministic, but will cause it to run at different speeds on displays with different refresh rates.
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- make_randelin
- - Joined 2 Mar, 2021
  - 2 topics • 3 posts
- 1
- 26 Mar, 2021
- Quote
Have you tried "Physics Set Stepping Mode" setting?

Choose whether the Physics time step uses dt (delta time, for Framerate independent) or a fixed value. By default it uses delta time to ensure physics progresses at a regular speed on displays with different refresh rates. However in some circumstances this can produce non-deterministic results, and note the Physics behavior clamps the maximum time step to 1/30 (about 33ms, equivalent to 30 FPS) to prevent the instability that can result from large time steps. Set to Fixed to always use a time step of 1/60 (about 16ms) regardless of the framerate, which makes the simulation deterministic, but will cause it to run at different speeds on displays with different refresh rates.

Yeah I have tried that. And the results can be seen In the video I posted. In both refresh rater the object has exactly same trajectory but with slow frame rates / refresh rates the object just moves slower.
- BadMario
- - Joined 3 Sep, 2015
  - 14 topics • 446 posts
- 1
- 26 Mar, 2021
- Quote
What are you using to launch your projectiles?

I have games with physics, always use independent frame rate setting and launching things with set velocity ( x and y ) produces consistent results. Tested on PCs, phones, different refresh rate monitor and with Construct 3s unlimited frame rate setting. Seems to work fine in all these tests.

The only "trick" I use is to set linear damping to 0 then once a projectile hits something set it to 1 or whatever to slow it down gradually

Give it a try
- make_randelin
- - Joined 2 Mar, 2021
  - 2 topics • 3 posts
- 1
- 26 Mar, 2021
- Quote
What are you using to launch your projectiles?

I have games with physics, always use independent frame rate setting and launching things with set velocity ( x and y ) produces consistent results. Tested on PCs, phones, different refresh rate monitor and with Construct 3s unlimited frame rate setting. Seems to work fine in all these tests.

The only "trick" I use is to set linear damping to 0 then once a projectile hits something set it to 1 or whatever to slow it down gradually

Give it a try

Yeah I'm using "Apply force towards position" because I want to aim with my mouse. Not sure tho is it the best way to do what I want. I will check the "set velocity" soon if I can make it work with the aiming.