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I tried the demo, it seems to be buggy and it seems to only allow you to choose existing items from a predefined db.

What bugs did you encounter? And yes, because we're using actual 3D models, there's a fixed set of models (right now, just under 300). Because the priority is ultra-realism, the current state-of-the-art for 3D model diffusion won't cut it (see OpenAI Point-e https://github.com/openai/point-e).

so you only project the background into a 3d model, and the foreground is not generated, but 3d models?

the bug I saw was after uploading a background image, on the right side, I only saw a generate and a reset button, nothing else. I clicked "generate", expecting it to ask me to input a prompt, but it started to render and the result was the same background I uploaded.

Yes that's correct. And for using it, you have to draw rectangles before you can add a prompt, similar to Photoshop's generative fill UI. Check out the video on the landing page. Lmk if you face further issues, and sorry about the lacking instructions (I'm not a great webdev).

maybe have a warning when no rectangles are drawn, I kinda wasted one credit by rendering an empty background.

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