Support for camera operations on the viewer/js side

editor/js/OpenSimEditor.js

@@ -1417,11 +1417,42 @@ OpenSimEditor.prototype = {
 					console.log(this.camera.matrix)
 					this.camera.updateProjectionMatrix()
 					// need to update the camera control in sync
+					this.signals.cameraChanged.dispatch(this.camera);
 					var changeEvent = { type: 'change' };
 					this.control.dispatchEvent( changeEvent );
 				}
 				break;
+			case "moveto":
+				let moveToCamName = json.targetCam
+				targetCamJSON = this.savedCameras[moveToCamName]
+				if (targetCamJSON !== undefined) {
+					let mat4 = new THREE.Matrix4().set(
+						targetCamJSON.object.matrix[0], targetCamJSON.object.matrix[4], targetCamJSON.object.matrix[8], targetCamJSON.object.matrix[12],
+						targetCamJSON.object.matrix[1], targetCamJSON.object.matrix[5], targetCamJSON.object.matrix[9], targetCamJSON.object.matrix[13],
+						targetCamJSON.object.matrix[2], targetCamJSON.object.matrix[6], targetCamJSON.object.matrix[10], targetCamJSON.object.matrix[14],
+						targetCamJSON.object.matrix[3], targetCamJSON.object.matrix[7], targetCamJSON.object.matrix[11], targetCamJSON.object.matrix[15]
+					)
+					var targetPos = new THREE.Vector3(0., 0., 0.)
+					var targetScale = new THREE.Vector3(1., 1., 1.)
+					var targetQuat = new THREE.Quaternion()
+					mat4.decompose(targetPos, targetQuat, targetScale)
+					this.signals.moveCameraTo.dispatch(targetPos, new THREE.Vector3(0., 0., 0.), targetQuat);
+				}
+				break;
+			case "toJson":
+				let dictionaryJson = JSON.stringify(this.savedCameras)
+				const a = document.createElement('a');
+				const blob = new Blob([JSON.stringify(dictionaryJson)]);
+				a.href = URL.createObjectURL(blob);
+				a.download = 'save_cameras.json';                     //filename to download
+				a.click();
+				break;
+			case "fromJson":
+				let camsList = json.cameras
+				let camsDictionary = JSON.parse(camsList)
+				// Populate this.savedCameras from camsDictionary
 
+				break;
 
 		}
 	}