cesium画三维旋转坐标
时间: 2023-09-19 14:06:10 浏览: 46
要在Cesium中画一个旋转的三维坐标,可以使用Cesium的Entity API和Quaternion旋转。以下是一个示例代码,可以在Cesium Sandbox中运行:
```javascript
var viewer = new Cesium.Viewer('cesiumContainer');
var position = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 0.0);
var heading = Cesium.Math.toRadians(45);
var pitch = Cesium.Math.toRadians(0);
var roll = Cesium.Math.toRadians(0);
var hpr = new Cesium.HeadingPitchRoll(heading, pitch, roll);
var orientation = Cesium.Transforms.headingPitchRollQuaternion(position, hpr);
var entity = viewer.entities.add({
name: 'Rotating Coordinate System',
position: position,
orientation: orientation,
model: {
uri: 'path/to/your/model.gltf'
}
});
viewer.clock.onTick.addEventListener(function() {
var time = viewer.clock.currentTime.secondsOfDay;
var angle = Cesium.Math.toRadians(time * 30);
var axis = new Cesium.Cartesian3(0, 0, 1);
var quaternion = Cesium.Quaternion.fromAxisAngle(axis, angle);
entity.orientation = quaternion.multiply(orientation);
});
```
其中,`position`是坐标的位置,`heading`、`pitch`和`roll`是坐标的方向,`hpr`是由这三个角度生成的HeadingPitchRoll对象,`orientation`是通过`position`和`hpr`计算得到的四元数。在`viewer.clock.onTick`事件中,我们通过计算时间,生成一个旋转的四元数,并将其乘以初始的四元数,从而不断改变坐标的方向,实现旋转效果。