The shortcode uses the default configuration of the Viewer (gray background with navbar). If you use minimal configuration, you may define camera position, camera limits etc for your model.
There is different skybox at Sandbox by default but you can choose studio environment at the right bottom menu. If you want to use your environment file with Viewer you need to define in in DOM (or with other ways) as it is described in the Docs - Configuring the Babylon.js Viewer | Babylon.js Documentation
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