Gaussian Splat from spz blurry on release 1.131

[TASallin]

What happened?

Rendering my spz splat with the latest build looks blurry like so - in order the pictures are from v1.131, a build splat spz concept branch from a couple weeks ago, and how it looks in supersplat

Here's my tileset.json for reference:

{ "asset": { "version": "1.1" }, "extensions": { "3DTILES_content_gltf": { "extensionsRequired": ["KHR_spz_gaussian_splats_compression"], "extensionsUsed": ["KHR_spz_gaussian_splats_compression"] } }, "extensionsUsed": ["3DTILES_content_gltf"], "geometricError": 65536, "root": { "boundingVolume": { "box": [ 0.059326172, 0.0, 0.040161133, 2047.9287, 0.0, 0.0, 0.0, 2047.9932, 0.0, 0.0, 0.0, 2047.8969 ] }, "geometricError": 32768, "refine": "REPLACE", "children": [ { "boundingVolume": { "box": [ 0.059326172, 0.0, 0.040161133, 2047.9287, 0.0, 0.0, 0.0, 2047.9932, 0.0, 0.0, 0.0, 2047.8969 ] }, "content": { "uri": "content.glb" }, "geometricError": 0, "refine": "REPLACE" } ], "transform": [ 0.13651037120540344, -0.011943109934188524, -0.06101049646137003, 0, 0.05685503340586642, 0.08353040358258985, 0.11086107005503541, 0, 0.025148036300688976, -0.12401626426573872, 0.08054528209516484, 0, 813767.8874033637, -5549000.826724425, 3027483.0551716527, 1 ] } }

I was working with it on the splat-spz-concept branch before that got merged into main and it looked mostly fine there, using the same code to load it in main aside from using the cdn for 1.131 has the render issues.

Reproduction steps

1. Get an spz gaussian splat and create a tileset.json and glb from it
2. Render the splat in cesium v1.131

...

Sandcastle example

No response

Environment

Browser: Chrome
CesiumJS Version: v1.131
Operating System: Windows

[ggetz]

Looks like this is on @keyboardspecialist's radar.

@keyboardspecialist Let us know if there's any follow-up questions here, or if you expect to open a PR.

[keyboardspecialist]

@TASallin Thanks for opening this issue. I believe it is related to the one I opened yesterday #12721

I used your tileset.json with my own test data and saw the same issue on main. However, using the branch linked in that issue renders correctly.

https://github.com/CesiumGS/cesium/tree/gsplat-scaling

If you could, give this branch a try.

[TASallin]

The gsplat scaling branch renders correctly for me as well, thank you