Jittering physics sprites when using per-object time scale on Xcode build but not remote preview

Hi,

In my physics-based hybrid pinball/basketball game, I implemented “myTimeScale” – a global that I used to define the game speed by setting the project’s time scale to it. I then multiplied various timers in the game by it to compensate. To pause, I set the project’s time scale to zero, then explicitly set the time scale of various objects that I needed to be active during pause (such as UI buttons) to 1.0.

I then decided to simplify things by switching things around. I realised that out of many objects in the game, I only needed to change the timescale of the ball and flippers, so created a family for these and set its time to “myTimeScale”. I then scrapped compensating the timers and setting various objects’ time scales to 1.0 on pause.

This works perfectly except that when I build for iOS using Xcode, there’s noticeable jitter of the ball when it causes the screen to scroll upwards (I have an invisible sprite attached several pixels below the ball with the follow behaviour).

When I run the game using remote preview, the jittering doesn’t occur. This is happening on a gen 10 iPad.

Can anyone think of a reason why this might be happening?

If not, it looks like I’ll have to revert to the original method.

Thanks!

Can you show your code so that we can take a look?

Does your project use scripting? It seems like there are some issues at the moment, so keep an eye on it.

You could also try to export using older versions of Construct to see if the issue persist.

If you find something let me know :)

I don't usually keep my exported Xcode projects, but I do use Google Drive to transfer them from my laptop to my Mac to build.

I found an exported zipped Xcode project from January in the trash and restored it. Unzipped it, built in in Xcode and installed it - no jittering.

So I opened the same project in Construct, exported it again as an Xcode project, built it and now the jittering returned.

In summary, a project exported and built in January doesn't jitter but the same project exported and built today does.

So it seems like some change in Construct's exporter has done this.

I'll some more troubleshooting later - like run a diff on the Xcode projects' folders and also try to create a minimal project.

(Note this only happens on an iPad running an exported Xcode project. The same project runs fine on an iPhone and fine on both if using remote preview).