Havok physics behavior is different on Android Chrome 106

VZS · June 8, 2023, 9:37am

Hello!

I’m trying to develop a physics based game with Android Chrome support, but physics calculations are wrong. Sphere doesn’t jump after collision and applying impulse results in very weak response. Problem happens only on Android Chrome 106.0.5249.126. Android Firefox, PC Chrome and PC Firefox are showing identical correct physics behaviours.

Repro scene:

To reproduce:

Run scene on Android Chrome 106.0.5249.126
Run the same scene in Android Firefox
Compare behaviors with PC Chrome and Firefox

Scene is just default one from physics docs, but only the sphere jumpiness was increased for demo purposes.

Comparison videos:

Chrome bug: chrome bug - YouTube
Firefox ok: /shorts/kJ62B9jmyWw

P.S.
I can’t update the Chrome on Android to latest and retest, because update is not installing due to unsupported device or Google’s regional sanctions, so if I release my game, some players from my region will have this problem too, because they can’t update for the same reasons.

RaananW · June 8, 2023, 11:02am

I tested on latest chrome and it works fine, but maybe @Cedric have an idea what could possibly happen here.

Is there any error in the console?

Cedric · June 8, 2023, 11:30am

Looks like a delta time problem to me: a delta frame time value that is too high to have reliable physics.
Can you please log the frame timings ?PerformanceMonitor | Babylon.js Documentation
Also, try with fixed time step (60Hz ) instead of reporting time:

VZS · June 8, 2023, 12:24pm

There are no errors

VZS · June 8, 2023, 12:28pm

I’ve tried both values in BABYLON.HavokPlugin(true/false, havokInstance) but strange thing happened - it started working on Android Chrome and I can’t reproduce the wrong behaviour anymore. On my real project this doesn’t help (flipping true/false). Is this some sort of web caching behaviour only in the Playground? How can I repro the problem again?

I did not collect frame timings because I can’t repro anymore.

Update:
Clearing the cache helps. Then again I flip the value, do several page refreshes and it keeps working. Also sphere’s speed is different between true/false values.

Cedric · June 8, 2023, 12:48pm

as I said, I think the delta time between 2 frame is too high (no idea why).
at least, with a fixed time step, you are sure to get the good timing. on the other side if your framerate is too different on various devices, experience might not be great.

VZS · June 8, 2023, 12:49pm

Got the log while problem is reproducing with “true” using:

const perf = new BABYLON.PerformanceMonitor();
        perf.enable();
        scene.registerBeforeRender(()=>{
            perf.sampleFrame();
            console.log(perf.instantaneousFrameTime);
        });

Hope it helps. High values are caused by Chrome remote debug

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babylon.playground.js?t=1686211225622:2 [Violation] Handling of 'touchstart' input event was delayed for 544 ms due to main thread being busy. Consider marking event handler as 'passive' to make the page more responsive.
[Violation] 'requestAnimationFrame' handler took <N>ms
[Violation] 'requestAnimationFrame' handler took <N>ms
[Violation] 'requestAnimationFrame' handler took <N>ms
[Violation] 'requestAnimationFrame' handler took <N>ms
[Violation] 'requestAnimationFrame' handler took <N>ms
babylon.js?t=1686211225622:1 Babylon.js v6.7.0 - WebGL2
babylon.playground.js?t=1686211225622:2 [Violation] 'requestIdleCallback' handler took 134ms
babylon.playground.js?t=1686211225622:2 [Violation] 'requestIdleCallback' handler took 92ms
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VM1982:20 32.60000002384186
VM1982:20 48.89999997615814
VM1982:20 24.900000035762787
VM1982:20 16.5
VM1982:20 21.5
VM1982:20 22.19999998807907
VM1982:20 26.80000001192093
VM1982:20 20
VM1982:20 30
VM1982:20 19
VM1982:20 30.599999964237213
VM1982:20 18.19999998807907
VM1982:20 23.600000023841858
VM1982:20 28
VM1982:20 31.19999998807907
VM1982:20 18.19999998807907
VM1982:20 31
VM1982:20 21.5
VM1982:20 31
VM1982:20 25.100000023841858
VM1982:20 25.899999976158142
VM1982:20 31.100000023841858
VM1982:20 20.80000001192093
VM1982:20 28.5
VM1982:20 23.19999998807907
VM1982:20 28.100000023841858
VM1982:20 24.599999964237213
VM1982:20 25.900000035762787
VM1982:20 32.19999998807907
VM1982:20 17.69999998807907
VM1982:20 31.399999976158142
VM1982:20 20.600000023841858
VM1982:20 28.600000023841858

Cedric · June 8, 2023, 12:51pm

frame time is very volatile …between 60ms and 9!!
Do you have some app running in the background that can explain the CPU usage?

VZS · June 8, 2023, 12:52pm

Yes, Chrome remote debug connected over cable lowers FPS, so those logs are not so helpful.

Cedric · June 8, 2023, 12:57pm

can you test this PG ? https://playground.babylonjs.com/#MDVCGR#8

VZS · June 8, 2023, 1:07pm

Sure, I’ve cleared the browser’s cache, run the example 3 times, then refreshed and re-run again. Each time there were none bounces from the ground. Chrome remote debug was disabled.

VZS · June 8, 2023, 1:13pm

Then, I’ve tried false and hit run. The first 2 times it wasn’t working. Then on each subsequent try it started jumping. So i needs false and several clicks to Run.

After, I’ve reverted to true and hit run several times, error didn’t come back. So I’m unsure what is happening in PG. In my real project both true/false doesn’t help, and I have no run/reload feature coded, so I can’t fix.

Cedric · June 8, 2023, 1:17pm

Might be related to wasm precompilation that’s taking a bunch of time (200ms visible in the log).
Does it happen with ammo/cannon?

VZS · June 8, 2023, 1:32pm

I’m sorry, I’ve tried copypasting from other PG the following, it works there, but not in my PG

let physicsPlugin = new BABYLON.AmmoJSPlugin();
scene.enablePhysics(BABYLON.Vector3.Zero(),physicsPlugin);

but it throws

caught (in promise) Error: Plugin version is incorrect. Expected version 2.

I do not understand why other PG works and mine do not.

Cedric · June 8, 2023, 1:38pm

try this 1

VZS · June 8, 2023, 2:46pm

This one simulates the same on all 4 browsers tested by me, only FPS differs, but bounciness is perfectly the same.

Cedric · June 8, 2023, 4:00pm

My guess is wasm compilation/optimization is not suitable for your platform. I would stick with ammo until chrome gets updated in your region.

VZS · June 8, 2023, 4:03pm

Thanks, I was finally able to port my project to ammo.

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