cesium 禁止相机进入地下

cesium 禁止相机进入地下

cesium 禁止相机进入地下
//设置相机禁止进入地下

//能解决的请回复一下
Tick.addEventListener(function () {// 获取高度var extent = il(viewer.camera.positionCartographic.height);if(viewer.camera.positionCartographic.height<100){var position = viewer.camera.position;position.z = position.z + 100;var heading = viewer.camera.heading;var roll = ll;console.log("pos:" + position + " head:" + heading + " roll:" + roll + " pitch:" + viewer.camera.pitch);viewer.camera.setView({destination: position,orientation: {heading: heading,pitch: viewer.camera.pitch,roll: roll}});}if (viewer.camera.pitch > Radians(-3)) {var position = viewer.camera.position;position.z = position.z + 1000;var heading = viewer.camera.heading;var roll = ll;console.log("pos:" + position + " head:" + heading + " roll:" + roll + " pitch:" + viewer.camera.pitch);viewer.camera.setView({destination: position,orientation: {heading: heading,pitch: Radians(-10),roll: roll}});}
});