No HDRI files, no image libraries — the studio is math.

The add-on owns the active World and builds an environment from up to 8 light slots. Each slot is a softbox-style light source with a shape, position, size, softness and color. Everything updates live in the viewport, and a chrome-ball preview in the panel shows the full environment at a glance.

When you want a file instead of a shader, switch to Baked Image mode: the exact same math is rendered into an equirectangular 32-bit image that you can paint on in the Image Editor and save as EXR. Preview, shader and bake share one evaluation core, so what you see is always what you get.