Cesium如何修改3dtiles的位置信息偏移经纬度高度和旋转角度

1.根据前后经纬度和高度计算变换矩阵-平移矩阵：

step1:根据tileset的边界球体中心点的笛卡尔坐标得到经纬度坐标

step2:根据经纬度和高度0，得到地面笛卡尔坐标

step3:根据经纬度和需要的高度，得到偏移后的笛卡尔坐标

step4:计算坐标变换，得到新的笛卡尔坐标

根据变换得到Matrix4变换矩阵

 

  var cartographic = Cesium.Cartographic.fromCartesian(tileset.boundingSphere.center);
    var surface = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, 0.0);
    var offset = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, height);
    var translation = Cesium.Cartesian3.subtract(offset, surface, new Cesium.Cartesian3());
    tileset.modelMatrix = Cesium.Matrix4.fromTranslation(translation);

1.根据旋转角度计算变换矩阵-旋转矩阵：

var hprRollZero = new Cesium.HeadingPitchRoll();

var position=Cesium.Cartesian3.fromDegrees(-123.075, 44.045000, 5000.0)

var converter= Cesium.Transforms.eastNorthUpToFixedFrame

var hpRoll = new Cesium.HeadingPitchRoll();

//计算原始的modelMatrix

  var modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(position, hprRollZero, Cesium.Ellipsoid.WGS84, converter);
    scene.primitives.add(new Cesium.DebugModelMatrixPrimitive({
        modelMatrix : modelMatrix,
        length : 300.0,
        width : 10.0
    }));

//当hproll变化后，计算新的modelMatrix

//每次移动单位为1度，转为弧度

// turn right
  hpRoll.heading += deltaRadians;

//

 hpRoll.pitch -= deltaRadians;

var deltaRadians = Cesium.Math.toRadians(1.0);

var medelMaxtrix=Cesium.Transforms.headingPitchRollToFixedFrame(position, hpRoll, Cesium.Ellipsoid.WGS84, converter, primitive.modelMatrix);