说在前面：加载和旋转缩放没什么好说的，但是平移还是用些细节要注意的。我也是跳了几天才偶然发现问题。
1.primitives方式加载：
handler.setInputAction(function (evt) {let cartesian = viewer.scene.pickPosition(evt.position);if (Cesium.defined(cartesian)) {let headingPitchRoll = new Cesium.HeadingPitchRoll(Cesium.Math.toRadians(0), Cesium.Math.toRadians(0), Cesium.Math.toRadians(0));let modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(cartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());let model = viewer.scene.primitives.add(Cesium.Model.fromGltf({url : '../src/data/GLTF/oneBuilding.gltf',modelMatrix : modelMatrix,minimumPixelSize : 128,scale : 1,cull:false,}));}}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
2.旋转和缩放（说明一点，我设定的鼠标在3Dtiles上移动点击才可以。向直接在地表点击的话可能需要修改 判断是否是渠道模型 的那句代码）
// 旋转的关键代码handler.setInputAction(function (evt) {let pickedObject = viewer.scene.pick(evt.position); //判断是否拾取到模型if ( pickedObject ){let m = pickedObject.primitive.modelMatrix;// 带旋转模型的矩阵let rotationM = Cesium.Matrix3.fromRotationZ(Cesium.Math.toRadians(rtaleX)); // rtaleX表示水平方向旋转的度数let newMatrix4 = Cesium.Matrix4.multiplyByMatrix3(m, rotationM, new Cesium.Matrix4());// 计算矩阵4的变换矩阵（在原变换中，累加变换）pickedObject.primitive.modelMatrix = newMatrix4}}, Cesium.ScreenSpaceEventType.LEFT_CLICK);// 调整高度的关键代码handler.setInputAction(function (evt) {let pickedObject = viewer.scene.pick(evt.position); //判断是否拾取到模型if ( pickedObject ){let oldMatrix = pickedObject.primitive.modelMatrix;// 模型的矩阵let oldCenter = new Cesium.Cartesian3(oldMatrix[12],oldMatrix[13],oldMatrix[14]);// 模型高度调整前中心点笛卡尔坐标let oldCartographic = Cesium.Cartographic.fromCartesian(oldCenter);// 高度调整前的弧度坐标let newHeight = oldCartographic.height+height;let newCartographic = new Cesium.Cartographic( oldCartographic.longitude, oldCartographic.latitude, newHeight ); // 高度调整后的弧度坐标let newCartesian = viewer.scene.globe.ellipsoid.cartographicToCartesian(newCartographic);let headingPitchRoll = new Cesium.HeadingPitchRoll(0,0,0);let m = Cesium.Transforms.headingPitchRollToFixedFrame(newCartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());pickedObject.primitive.modelMatrix = m;// 平移变换}}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
3平移：这是我写这篇博客的关键。管网demo里升降平移是对3Dtiles，对gltf不一定有效的，我也是愣了几天偶然改正确的，主要就是获取鼠标移动时坐标。
// 移动模型function moveGltfModel ( ) {let _this = this;let viewer = _this.viewer;let handler = new Cesium.ScreenSpaceEventHandler( viewer.canvas);let pickedObject = null;let leftDownFlag = false;let rtaleX = parseFloat( $("#rangeRtaleX").val() );handler.setInputAction(function (movement) {pickedObject = viewer.scene.pick(movement.position);if(Cesium.defined(pickedObject)){if (pickedObject.primitive.isCesium3DTileset == undefined ){leftDownFlag = true;document.body.style.cursor = 'pointer';viewer.scene.screenSpaceCameraController.enableRotate = false;//锁定相机pickedObject.primitive.color = new Cesium.Color(0, 1, 0, 1); //选中模型后高亮pickedObject.primitive.silhouetteSize = 3.0;//选中模型后高亮}}}, Cesium.ScreenSpaceEventType.LEFT_DOWN);handler.setInputAction(function () {pickedObject.primitive.color = new Cesium.Color(1, 1, 1, 1);pickedObject.primitive.silhouetteSize = 0;leftDownFlag = false;pickedObject = null;viewer.scene.screenSpaceCameraController.enableRotate = true;//解除锁定相机handler.destroy();//销毁左键监听事件document.body.style.cursor = 'default';}, Cesium.ScreenSpaceEventType.LEFT_UP);handler.setInputAction((movement) => {if ( leftDownFlag && pickedObject.primitive.modelMatrix ) {// ************g关键代码：cartesian的值************let ray = viewer.camera.getPickRay(movement.endPosition);let cartesian = viewer.scene.globe.pick(ray, viewer.scene);let headingPitchRoll = new Cesium.HeadingPitchRoll( Cesium.Math.toRadians(0),0,0);let m = Cesium.Transforms.headingPitchRollToFixedFrame(cartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());pickedObject.primitive.modelMatrix = m;}}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);}
说明一下：我之前用了好几种获取鼠标坐标导致的结果是移动时会到处跑。但下面这样获取就不会。
// 这样获取就不会到处跑let ray = viewer.camera.getPickRay(movement.endPosition);let cartesian = viewer.scene.globe.pick(ray, viewer.scene);//列几种我之前的获取方式会出问题的额 // let headingPitchRoll = new Cesium.HeadingPitchRoll(0,0,0);// let cartesian = viewer.scene.pickPosition(movement.endPosition);// let headingPitchRoll = new Cesium.HeadingPitchRoll(0,0,0);// let position = viewer.scene.globe.pick(viewer.camera.getPickRay(movement.endPosition), viewer.scene);// 获取鼠标移动后的点// let cartesian = new Cesium.Cartesian3( position.x, position.y, position.z )
扩展一下：entity加载的话，直接修改entity的position就可以了
handler.setInputAction(function (movement) {if (leftDownFlag === true && pointDraged != null) {let ray = viewer.camera.getPickRay(movement.endPosition);let cartesian = viewer.scene.globe.pick(ray, viewer.scene);console.log(cartesian);pointDraged.id.position = new Cesium.CallbackProperty(function () {return cartesian;}, false);//防止闪烁，在移动的过程}}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
