Camera velocity uneven about stk-code HOT 27 CLOSED

With the new camera, I am not sure if this is an issue any longer.

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It's much better with the new camera, though unfortunately in one occasion I reproduced stutter

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Same procedure as last release? Same procedure as every release ... postponed :(

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I notice this problem very often with the add-on track "Lava fields" even with good FPS (no advanced pipeline, all other settings turned to max).

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Should have improved a lot in latest git. We can reopen if we ever reproduce it again...

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Umm... Still very reproducible for me (as in I can't not reproduce it).

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After having lived with this issue a while, I noticed that it seems like it is related to how hot my CPU/GPU gets (Intel HD 3000, so the GPU is on the CPU chip).

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@qwertychouskie How much is your FPS (since HD 3000 is the minimum) ? And if your GPU is hot it would throttle or display artifacts (if it is old).

On my laptop with Radeon HD 7640g since upgrading to Ubuntu 16.04 (with those terrible drivers that lag) the kart is moving back and forward slightly (game is still playable , FPS is around 25). I am using 0.9.2 with advanced pipeline and a lot of other effects enabled

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Low FPS do not seem to be the cause of the issue, it is still noticeable with the advanced pipeline turned off, even on the low-resource "Lava Fields" race.

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I am wondering if systems that use Mesa specifically are affected by this issue.

Should have improved a lot in latest git. We can reopen if we ever reproduce it again...

@auriamg Can this be reopened, since it is still reproducible?

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@qwertychouskie I am using Mesa git from padoka PPA (recommened instead of Oibaf for HD 7000 and above , don't know about Intel / NVIDIA).

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Hmm, the OpenGL 2.1 pipeline does not seem to have the issue, definitely something related to the graphics drivers...

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I take that back, it can happen in the OpenGL 2.1 pipeline, but it requires very high CPU use (in my case, the latest STK auto-compiling) to trigger it.

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@qwertychouskie you are probably getting an uneven framerate. getting the game totally smooth despite an erratic framerate will be hard...

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@auriamg I have about 25 FPS which looks smooth

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@auriamg Then it is one of the most uneven framerates in existence ;)
https://jacobspctuneup.tk/bug.webm

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@qwertychouskie Mine is smooth but it moves back and forward slightly

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I recorded a replay while it was doing it, and later played the replay when it was not doing it. The replay was smooth, which indicates the the kart itself is not moving, but the problem lies with the camera.

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@qwertychouskie How many FPS did you record the replay at ?

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I ment a ghost replay.

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@qwertychouskie Mine also looks like that video sometimes but doesn't lag

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In my opinion, this has not been fixed to a satisfactory degree. See https://youtu.be/XFKwCTh8mAg for an example. I used OpenGL capture which should not introduce additional overhead, but set it to limit framerate to 30 FPS.

As can be seen in the video, there's quite a lot of shaking back and forth going on, even when framerate is at a reasonably steady 28-31 FPS. Even when not doing OpenGL capture and thus not limiting framerate, it still shakes noticeably (but not as much). That would be around 50 FPS in the same track with the same settings.

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Actually, looking at the video again, maybe it's not the camera that's shaking, but the kart itself? Kinda looks that way, but it's a bit hard to tell what causes what. In any case it's an issue worth looking into in my opinion, however maybe it should be put in a separate ticket. Any thoughts?

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Looking at that video at a really low speed, the distance between the camera and kart is definitively changing, though it is hard to tell whether the kart is moving back and forth or not.

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Maybe it can be fixed by "smoothing" the delta t in smooth camera too

in void CameraNormal::smoothMoveCamera(float dt) line 108, change to something like this:

    float f = 5.0f;
    if ((current_speed > 5 ) || (current_speed < 0 ))
    {
       f = current_speed >0 ?         current_speed/3 + 1.0f
                            : -1.5f * current_speed   + 2.0f;
    }
    static float smooth_dt = 0.0f;
    smooth_dt = 0.3f * dt + 0.7f * smooth_dt;
    current_position += (wanted_position - current_position) * (smooth_dt *f);

This quick hack only with 1 camera (singleplayer), if work we can fix this properly.

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I believe this patch helped with the worst spikes, which were obviously the most important ones to fix - the micro-stuttering might be very framerate-dependent. But it certainly helped with the jerkiest movements, thanks. :)

I hope this can be merged into the game.

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Commited fix

Please reopen if this issue should still occur.

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