Odtnhj

I have created an extension that rotates the camera around a Revit model that was uploaded in a bucket made, but how do I make the camera constantly rotate around the model after the button in the toolbar has been clicked on. In addition, how do I click the same button again to stop the rotation? The code below is what I used to rotate the camera once the button is clicked on.

var _this = this;
var _viewer = _this.viewer;
var turnTableToolbarButton = new Autodesk.Viewing.UI.Button('turnTableButton');
turnTableToolbarButton.onClick = function (e) 

 const nav = _viewer.navigation;
 const up = nav.getCameraUpVector();
 var pos = nav.getPosition();
 const axis = new THREE.Vector3(0, 0, 1);
 const speed = 10.0 * Math.PI / 180;

 const matrix = new THREE.Matrix4().makeRotationAxis(axis, speed * 0.1);

 pos.applyMatrix4(matrix);
 up.applyMatrix4(matrix);

 nav.setView(pos, new THREE.Vector3(0, 0, 0));
 nav.setCameraUpVector(up);
 var viewState = _viewer.getState();
 _viewer.restoreState(viewState);
;

I think what you would need here is use of requestAnimation, with your button stopping or starting the request for the new frame:

 let started = false;

 let rotateCamera = () => 
 if (started) 
 requestAnimationFrame(rotateCamera);
 

 const nav = viewer.navigation;
 const up = nav.getCameraUpVector();
 const axis = new THREE.Vector3(0, 0, 1);
 const speed = 10.0 * Math.PI / 180;
 const matrix = new THREE.Matrix4().makeRotationAxis(axis, speed * 0.1);

 let pos = nav.getPosition();
 pos.applyMatrix4(matrix);
 up.applyMatrix4(matrix);
 nav.setView(pos, new THREE.Vector3(0, 0, 0));
 nav.setCameraUpVector(up);
 var viewState = viewer.getState();
 // viewer.restoreState(viewState);

 ;

 turnTableToolbarButton.onClick = function (e) 
 started = !started;
 if (started) rotateCamera()
 ;

Check my repo of extensions for full code based on your snippet and a live illustration.