3D Tiles Gaussian model becomes blurry after rotation

[JaneLucky]

What happened?

When loading a 3D Tiles format Gaussian model in Cesium, the model appears clear and sharp when only longitude and latitude are set. However, once rotation is applied to the model, the clarity significantly degrades and becomes blurry.
codeing below:

const local = Cesium.Cartesian3.fromDegrees(***, ***, **);
function updateTilesetTransform(headingDeg, pitchDeg, rollDeg) {
const hpr = new Cesium.HeadingPitchRoll(
Cesium.Math.toRadians(headingDeg),
Cesium.Math.toRadians(pitchDeg),
Cesium.Math.toRadians(rollDeg)
);
tileset.root.transform = Cesium.Transforms.headingPitchRollToFixedFrame(local, hpr); // set position and rotation
}
updateTilesetTransform(, *, *);

Reproduction steps

1、Load a 3D Tiles Gaussian model in Cesium;
2、Set only longitude and latitude (no rotation) → model is show good;

3、Apply rotation to the model → model becomes blurry;

Sandcastle example

No response

Environment

Browser: Google Chrome
CesiumJS Version: Cesium 1.139.1
Operating System: window 10

AI acknowledgment

• I used AI to generate this issue report.
• (If the above is checked) I have reviewed the AI-generated content before submitting.

[javagl]

There have been many bugfixes for splats in the latest release. Specifically, what you are describing is probably the same as #12749 and this should be fixed with #13305

Can you try it again with version 1.140 (released two days ago)? I'm pretty sure that the issue is already resolved. If not, let us know.