Update viewer.js

viewer.js

@@ -281,6 +281,7 @@ export async function initializeViewer(config, instanceId) {
     });
     cameraEntity.script.create('orbitCameraInputMouse');
     cameraEntity.script.create('orbitCameraInputTouch');
+    cameraEntity.script.create('orbitCameraInputKeyboard');
     app.root.addChild(cameraEntity);
 
     app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);