.KSplat Color issue with spherical harmonic

[hyqshr]

While rendering my scene with .ksplat with 0 sphericalHarmonicsDegree, it worked well:

        const viewer = new GaussianSplats3D.DropInViewer({
            sharedMemoryForWorkers: false,
            showLoadingUI: true,
            format: GaussianSplats3D.SceneFormat.KSplat,
            sphericalHarmonicsDegree: 0
        });

But when I change the sphericalHarmonicsDegree to 1 or 2, the color seems to be broken:

[mkkellogg]

Out of curiosity, how many splats are in your scene?

[hyqshr]

Only 1 splat.

The broken color issue happens on .ply as well, but only when sh_degree is 1 (0 or 2 is fine). My model is trained from splatfacto-w (https://docs.nerf.studio/nerfology/methods/splatw.html) not sure if this the reason?

[mkkellogg]

Sorry let me rephrase, how many individual splat "blobs" are in your scene? If you press the 'I" key, you'll bring up an info panel that will give you that info:

[hyqshr]

I press "I" and I can not bring up the info panel. Is there other way I could print this?

[hyqshr]

Also - is there a python script to convert ply to ksplat? I think it can help a lot of folk's workflow. I can create a PR if needed

[mkkellogg]

If you want to send me your .ksplat or .ply file, I can tell you how many splats it has. My suspicion is that it has a large number, which can cause issues because there's not enough memory to store spherical harmonics data.

You could also load it in the online viewer here: https://projects.markkellogg.org/threejs/demo_gaussian_splats_3d.php and if you press 'I' in that viewer, it should bring up the info panel.

[hyqshr]

Below is the info panel. The weird thing is the broken color seems only happens at sh_degree=1 for this KSplat. 0 and 2 are fine

[hyqshr]

I have another model have the same issue when sh_degree is 1 in viewer

[mkkellogg]

That is pretty weird, would you mind sharing your .ply or .ksplat file and I can try to debug?

[hyqshr]

Thank you! Not sure why this link download .ttf format, but I can reproduce the error when I change it to .ksplat

https://forreal.blob.core.windows.net/forreal-model/0/splat-w-office.ksplat?sv=2023-01-03&st=2024-11-22T16%3A33%3A19Z&se=2024-11-23T16%3A33%3A19Z&sr=b&sp=r&sig=YVWvuRTBzwTA4UgOh%2BPyn5UQ9sKhU8EC01dmI4idyr4%3D

[mkkellogg]

Would you also be able to share your original .ply as well? And do you know how many SH degrees should be present in the file?

Also, I get an error when I try to access the above link: