Iphone X renders completely different with same asset and same settings

[pesa2000]

Hi Mark, how are you?

I was making a couple of tests on my implementation of your viewer and i noticed something really strange happening on an old iphone of mine, on this iphoneX as you can see there is something really strange.

This is the render in every other devices

Can this be something browser related like a safari version?

[mkkellogg]

Have you tried different browsers besides Safari? Also, have you tried setting sharedMemoryForWorkers to false when instantiating the Viewer?

[pesa2000]

these are the settings im currently using for both the scene and the viewer.

I'll let you know asap if it happens in other browsers too.

[lucarinaldii]

Same problem for me with iPhone 8 @mkkellogg

[pesa2000]

Hi Mark, i had the possibility to test this error on another device too.

like @lucarinaldii i faced the same problem on iphone 8 and iphoneX

this is an example tested with both safari and chrome.

both iphones uses the latest IOS 16 version.

are there any settings that you know that can give those type of problems? maybe like "gpuAcceleratedSort" or "halfPreciosCovarianceOnGpu"?

for reference this is the correct one

Thank you for your time and patience.

[mkkellogg]

Sorry for the late response, what type of file are you trying to load? If it is a .ply file, you might want to try setting plyInMemoryCompressionLevel: 0. You should also try setting halfPrecisionCovariancesOnGpu: false (make sure to check the spelling), integerBasedSort: false, and antialiased:false (unless you know for sure it is an anti-aliased scene).

[pesa2000]

Thank you for the response, ill try it asap. In the meantime i found this #265 , are these problems related?

Thank you for your time and patience.

[pesa2000]

Hi Mark, like the #265 the problem seems related to the selector of the WebAssembly configuration.

In my case since im not using shared memory the code that is indeed executed is the first condition.

With the version 16.2 the sourceWasm is set to "SorterWasmNoSIMD" and doesnt work, i modified it(just for test) and added a new line making it that the configuration chosen is always "SorterWasmNoSIMDNonShared", in this way it seems to work.

Is there a way to map those configurations more precisely?

[mkkellogg]

Would you be able to try the memory-optimizations branch and see if that works for you?

[pesa2000]

Tested on the same device i tested yesterday and now it seems to work, but i have a new error when loading a new splat(the first one loaded seems always to work) this is it:

The view completely freeze and doesnt even unload the previous one.

[pesa2000]

I tested a couple more things, the error above is related to the latest version too(0.4.4), switching back to 0.4.3 fixes the issue. The memory-optimizations branch has indeed the same problem.

[mkkellogg]

Did you mean the memory-optimizations branch has the same error cause by runSplatSort()? I just pushed a fix for that this morning. If that issue is resolved, but the visual glitch is still there, I'll keep digging. The code should now select the SorterWasmNoSIMDNonShared WASM module if your iOS version is equal to or below 16.4, as long as enableSIMDInSort is false and sharedMemoryForWorkers is false.

[pesa2000]

I mean that using the latest version(0.4.4) has now the same problem as mentioned above(the runsplatSort problem).

0.4.3 is fine so maybe is related to the changes above?

To reproduce this error i called the removeSplatScene from the viewer before loading a new splat, as mentioned earlier just loading one splat works correctly since i never call removeSplatScene.

[mkkellogg]

Good to know. I just pushed a fix for the runSplatSort() problem to the memory-optimizations branch this morning so I think it should be fixed there.

[pesa2000]

Perfect, seems fixed right now for both problems.

I will try to let you know if i find more problems related to IOS devices.

Thank you very much for now, ill wait for the release.

[pesa2000]

Since i have this ticket open i wanted to ask something else.

I tried to create a ShaderMaterial to use on a spherical object with a custom vertex shader, i wanted to use this sphere to wrap the splat object to create some sort of background gradient that can rotate with the camera.

When i use this sphere with a glb it renders correctly, when i try to do it on a splat it seems like that the splat is overwriting every pixel of the canvas making it impossible to render the sphere.

Is there something i can try to do? Didnt have luck with the "renderOrder" option

[mkkellogg]

It sounds like you essentially need to mix normal three.js objects with the splats? There's a section of the README that talks about that: https://github.com/mkkellogg/GaussianSplats3D?tab=readme-ov-file#integrating-threejs-scenes. If that's not quite what you're trying to do, maybe you can post your code and I can try to help.

[pesa2000]

As soon as i have a little more time i will send to you a snippet of my code.

I'll open a new ticket for that, for now the issue above seems resolved for every IOS device. Thank you again.