rotate 3dtile doesn't work in cesiumjs 1.66

[peterchen2001]

Hi experts,

Below code snippet works in early cesium version, however the 3dtile disappear in cesiumjs 1.66, how to rotate 3dtile in new version? thands in advance for any clues.

var m = tileset.modelMatrix;
var m1 = Cesium.Matrix3.fromRotationX(Cesium.Math.toRadians(rotateXAngle));
Cesium.Matrix4.multiplyByMatrix3(modelMatrix, m1, modelMatrix);
tileset.modelMatrix = m;

[OmarShehata]

I believe this is an issue with older 3D Tilesets. There's a suggested source code fix here: #6755 (comment)

Or you can upgrade your tileset as described here: #7036 (comment)