3d-中旋转摄像机

// 旋转相机

rotateCamera (axis, speed, dt) {    // var camera = viewer.getCamera()    // var pivot = camera.pivot;    // camera.target = pivot;    // var target = camera.target    // var dt = 1;    // dt+=1;    // var posx = target.x   +  1000*Math.cos(dt * 3.14 /180);    // var posy = target.y   +  1000*Math.cos(1 * 3.14 /180);    // camera.position.x = posx    // camera.position.y = posy    var nav = viewerAll.navigation;    var up = nav.getCameraUpVector()    var pos = nav.getPosition()    var matrix = new THREE.Matrix4().makeRotationAxis(        axis, speed * dt);    // viewer.impl.invalidate (true)    pos.applyMatrix4(matrix)    up.applyMatrix4(matrix)    nav.setView(pos, new THREE.Vector3(0,0,1))    nav.setCameraUpVector(up)}runAnimation () {    if(viewer.animateFlag){        var dt = 0.01;        dt+=0.01;        var axis = new THREE.Vector3(0,0,1);        viewer.vmethods.rotateCamera(axis, 10.0 * Math.PI/180, dt);        window.requestAnimationFrame(viewer.vmethods.runAnimation);    }}1