3dtiles is a little bit inclined,How to modify in the code?

CesiumJS
1

1. A concise explanation of the problem you're experiencing.

3dtiles is a little bit inclined, I want to change the angle of the 3dtiles

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

var boundingSphere = new Cesium.BoundingSphere(Cesium.Cartesian3.fromDegrees(121.6184585, 31.1288196, -18.99991009), 560.7095979);
         var Sunkingtileset = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({
             url: './3dtiles/Qinxi/3DTiles.json',
             maximumScreenSpaceError : 1,
             maximumNumberOfLoadedTiles : 1000
   }));

         Sunkingtileset.readyPromise.then(function (Sunkingtileset) {
               var cartographic = Cesium.Cartographic.fromCartesian(Sunkingtileset.boundingSphere.center);
               var surface = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, 0.0);
               var offset = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, 20);
               var translation = Cesium.Cartesian3.subtract(offset, surface, new Cesium.Cartesian3());
               viewer.camera.flyToBoundingSphere(boundingSphere, {duration: 3});
               Sunkingtileset.modelMatrix = Cesium.Matrix4.fromRotationTranslation(Cesium.Matrix3.fromRotationZ(Cesium.Math.toRadians(45)), translation);
         });

As shown in the code, I want to turn the 3dtiles model to 45 degrees in the Z axis but not in effect

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

Because my 3dtiles model has a little bit of tilt

4. The Cesium version you're using, your operating system and browser.

1.41 Chrome

2

If the modelMatrix is the identity, you may need to apply the rotation to the root tile, like so:

var matrix = tileset._root.transform;
var rotation = Cesium.Matrix3.fromRotationZ(Cesium.Math.toRadians(45));
Cesium.Matrix4.multiplyByMatrix3(matrix, rotation, matrix);

``

Here’s an example with it working in Sandcastle.

Thanks,

Gabby

3

If the tileset uses the CESIUM_RTC extension setting the rotation may not work because of the interaction between the RTC and model matrix. This affects tilesets produced by ContextCapture. Could you send over the tileset?