moving existing AWS Sumerian scene to Babylon.js-AWS Amplify

The way you do this will be vary depending on what functionality your scene contains. But generally speaking, you'll do the following:

1. Export your Sumerian scene as glTF. This will give you the models, materials, and animations from your scene. This tutorial will help.
2. Create a new Babylon.js project using either the BabylonJS API (code-only approach) or the BabylonJS Editor (visual approach). In both cases, you'll need to use the documentation provided by Babylon for guidance.
3. If your scene uses Sumerian Hosts or Amazon Lex, we've open-sourced those components of Sumerian. You can find instructions and demo applications that show you how to use them in BabylonJS at our official GitHub repository.

Since there is no way to export the logic and interactivity from Sumerian (including logic you've created using State Machines), you'll have to recreate that functionality from scratch directly in BabylonJS using JavaScript or TypeScript.

Finally, here are some other Sumerian migration tutorials that may help.