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In Marble, you can upload an image to generate a 3D world. Once the world is created, you can modify the background by adjusting the seed for randomized variation, or by editing the World Guide for more precise control.

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1. Change the Seed

  • Go to Settings in the bottom-left corner.
  • Adjust the Seed value.
  • Each new seed introduces randomized background variations.
  • Example: changing the seed might transform a wall into a hallway or shift lighting.
👉 Try it: change the seed, hit Generate, and see what new background variation appears.

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2. Edit the World Guide for More Control

If you want more precise control over what appears in the background, edit the World Guide directly.
  • This lets you refine elements beyond random seed changes.