Cesium 模型（model）添加，平移，縮放，透明度，旋轉

const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);

添加model

    handler.setInputAction((movement) => {//鼠標左鍵事件，點擊地圖，在點擊位置添加模型
      var cartesian = viewer.scene.globe.pick(viewer.camera.getPickRay(movement.position), viewer.scene);//獲取地形上的點
      const newHeading = Cesium.Math.toRadians(0); //初始heading值賦0
      const newPitch = Cesium.Math.toRadians(0);
      const newRoll = Cesium.Math.toRadians(0);
      const headingPitchRoll = new Cesium.HeadingPitchRoll(newHeading, newPitch, newRoll);
      const modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(cartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());
      viewer.scene.primitives.add(Cesium.Model.fromGltf({
        url, // 模型地址
        modelMatrix,
      }));
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

平移模型

    handler.setInputAction((movement) => {
      pick = viewer.scene.pick(movement.position);
      if (pick != undefined) {
        pick.primitive.silhouetteColor = Cesium.Color.RED; //選中模型後高亮
        pick.primitive.silhouetteSize = 3.0;
        handler.setInputAction((movement) => { //點擊模型後添加鼠標移動事件
          const m1 = Cesium.Transforms.eastNorthUpToFixedFrame(Cesium.Matrix4.getTranslation(pick.primitive.modelMatrix, new Cesium.Cartesian3()), Cesium.Ellipsoid.WGS84, new Cesium.Matrix4());
          const m3 = Cesium.Matrix4.multiply(Cesium.Matrix4.inverse(m1, new Cesium.Matrix4()), pick.primitive.modelMatrix, new Cesium.Matrix4());
          const mat3 = Cesium.Matrix4.getRotation(m3, new Cesium.Matrix3());
          const q = Cesium.Quaternion.fromRotationMatrix(mat3);
          const hpr = Cesium.HeadingPitchRoll.fromQuaternion(q);
          const headingPitchRoll = new Cesium.HeadingPitchRoll(hpr.heading, hpr.pitch, hpr.roll);// 獲取當前模型heading，pitch，roll
          var cartesian = viewer.scene.globe.pick(viewer.camera.getPickRay(movement.endPosition), viewer.scene);// 獲取鼠標移動後的點
          const m = Cesium.Transforms.headingPitchRollToFixedFrame(cartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());
          pick.primitive.modelMatrix = m;
        }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
      } 
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

模型旋轉

以調整Heading爲例

    const curModelMatrix = curModel.modelMatrix; // 獲取當前模型modelMatrix
    const cartesian = new Cesium.Cartesian3(curModelMatrix[12], curModelMatrix[13], curModelMatrix[14]);
    const newHeading = Cesium.Math.toRadians(value);//改變Heading值
    const newPitch = Cesium.Math.toRadians(pitch);// pitch值填當前模型pitch，上文介紹過如何獲取
    const newRoll = Cesium.Math.toRadians(roll);// 同上
    const headingPitchRoll = new Cesium.HeadingPitchRoll(newHeading, newPitch, newRoll);
    const m = Cesium.Transforms.headingPitchRollToFixedFrame(cartesian, headingPitchRoll, Cesium.Ellipsoid.WGS84, Cesium.Transforms.eastNorthUpToFixedFrame, new Cesium.Matrix4());
    curModel.modelMatrix = m; //新的modelMatrix賦給模型

模型比例

curModel.scale = 10;

模型透明度

    curModel.color = Cesium.Color.WHITE.withAlpha(0.1);