Rendering issue with car on iOS 15.4 where it doesn't update when camera is moving

[yaustar]

Rendering issue with car on iOS 15.4 where it doesn't update when camera is moving

[yaustar]

I've been unable to reproduce this on browsertack with iOS 15.0 on the same device model

Unable to reproduce on iOS 15.3 too

Wondering if it's related to iOS 15.4?

[yaustar]

Confirmed that the issue happens on iOS 15.4.1 and doesn't happen on iOS 15.2

[yaustar]

Just tried a normal PlayCanvas app with auto render disabled on 15.4.1 and that works fine. The issue seems specific to the model viewer

[slimbuck]

It seems related to multisampling the offscreen render target. Disabling multiple samples results in it working correctly.

[mvaligursky]

So far from what I've seen the antialising on the framebuffer is causing the issue, but it's possible AA on render targets has some similar issue. I confirmed when testing the original issue that https://playcanvas.github.io/#/graphics/render-to-texture works correctly and uses 2 samples on the render target.

Feel free to set maxSamples to 1 to avoid it as you suggested playcanvas/engine#4184 (comment)

[slimbuck]

So far from what I've seen the antialising on the framebuffer is causing the issue, but it's possible AA on render targets has some similar issue. I confirmed when testing the original issue that https://playcanvas.github.io/#/graphics/render-to-texture works correctly and uses 2 samples on the render target.

Feel free to set maxSamples to 1 to avoid it as you suggested playcanvas/engine#4184 (comment)

One of the tickets you linked to mentioned offscreen buffers also being a problem. The RTT example with multisampling works for me too, but the viewer doesn't. Viewer creates a depth texture for reading later, perhaps that's the difference.

[yaustar]

Confirmed fixed with the latest release of the model viewer