cesium3dtiles位置改变

cesium偏移3dtiles高度
var heightOffset = 20.0;
var boundingSphere = tileset.boundingSphere;
var cartographic = Cesium.Cartographic.fromCartesian(boundingSphere.center);
var surface = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, 0.0);
var offset = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, heightOffset);
var translation = Cesium.Cartesian3.subtract(offset, surface, new Cesium.Cartesian3());
tileset.modelMatrix = Cesium.Matrix4.fromTranslation(translation);

cesium设置3dtiles位置朝向

var targetPosition = Cesium.Cartesian3.fromDegrees(121.46175, 31.40674, 0);
var headingPitchRoll = new Cesium.HeadingPitchRoll(0, 0, 0);
var modelMatrix = new Cesium.Matrix4();
Cesium.Transforms.headingPitchRollToFixedFrame(targetPosition, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, modelMatrix);
tileset.modelMatrix =modelMatrix;
viewer.camera.flyTo({
    destination:tileset.boundingSphere.center
});

cesium添加实体并设置位置朝向

var position = Cesium.Cartesian3.fromDegrees(-123.0744619, 44.0503706, height);
var heading = Cesium.Math.toRadians(135);
var pitch = 0;
var roll = 0;
var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);
var orientation = Cesium.Transforms.headingPitchRollQuaternion(position, hpr);

var entity = viewer.entities.add({
name : url,
position : position,
orientation : orientation,
model : {
uri : url,
minimumPixelSize : 128,
maximumScale : 20000
}
});
viewer.trackedEntity = entity;