Marble turns a blocked-out 3D layout into a finished world

Marble gives creators a way to specify a world's arrangement separately from its appearance. World Labs promotes starting with a rough 3D layout made in any 3D tool. The post does not name the feature, but the company's November 2025 Chisel explanation describes a matching workflow: simple boxes, planes or imported assets establish the scene, then a text prompt sets its visual style.

The layout guides where things go while the prompt guides how they look. According to that explanation, changing the prompt produces different appearances that share the same underlying structure, giving creators spatial control before detailed generation. The attached video was not reviewed, so the post's own claim of going from layout to a finished world in minutes is not evaluated here.