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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
And it is open source, so it's totally possible to extend: https://github.com/polygonjs/polygonjs
And I should really clarify one thing, which is that you wouldn't need to "switch" from pure threejs or r3f. Polygonjs is designed to work both as a main tool as well as alongside threejs/r3f. For instance, those 2 repositories show how to integrate them together: threejs integration example and r3f examples.
And I should really clarify one thing, which is that you wouldn't need to "switch" from pure threejs or r3f. Polygonjs is designed to work both as a main tool as well as alongside threejs/r3f. For instance, those 2 repositories show how to integrate them together: threejs integration example and r3f examples.