You can use URL parameters to navigate in scenes and perform operations that are similar to those in the user interface (UI). Some of the more common operations you may use are navigating to a specific camera view or slide, opening a URL service in a scene, or minimizing the Scene Viewer UI to embed in third-party apps.
Define a viewpoint
To define a viewpoint in the URL, use the &viewpoint=cam:<coordinates> parameter.
In this example, the &viewpoint=cam: parameter opens the scene item b04e44630e4d4f788b4fec3f2d8c9ace at the coordinates of the Inner Alster Lake in Hamburg, Germany.
https://www.arcgis.com/home/webscene/viewer.html?webscene=b04e44630e4d4f788b4fec3f2d8c9ace&viewpoint=cam:9.98717314,53.54101423,847.391;23.206,65.41View this example in Scene Viewer
Note:
If you don't have the coordinates of the viewpoint in the scene, you can obtain them by clicking the Share button 
, unchecking the Short link box, and copying the link.
Open a slide
To open a scene to a specific slide, add the #<slide-number> parameter.
In this example, the #3 parameter opens the scene item 6c7a0d4f03d2444fb1f4fa9e85a96044 to the Hafenviertel slide in Linz, Austria, the third slide in the scene. https://www.maps.arcgis.com/home/webscene/viewer.html?webscene=6c7a0d4f03d2444fb1f4fa9e85a96044#3
Open a service by URL
If you have a URL of a service that you want to open directly in a scene, use the ?url=<service> parameter.
In this example, the ?url=<service> parameter opens a scene that loads the Portland, Oregon, building service:https://www.maps.arcgis.com/home/webscene/viewer.html?url=https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Portland/SceneServer
Embed minimal Scene Viewer UI
When you want to embed a scene in a third-party app, you may want a minimal Scene Viewer UI to not complicate the web page. To do this, add the &ui=min parameter.
In this example, the &ui=min parameter opens the Vancouver, Canada, scene in Scene Viewer with minimal UI:https://www.maps.arcgis.com/home/webscene/viewer.html?webscene=c7da180e4ca4414caa923d2e2724eb5c&ui=min
Use multiple parameters
To include more than one parameter, use an ampersand (&) to separate the parameters.
In this example, the & character separates the url= and the viewpoint=cam: parameters:
https://www.arcgis.com/home/webscene/viewer.html?url=https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Portland/SceneServer&viewpoint=cam:-122.67434468,45.51190967,318.448;3.757,74.342