Panels sort by filename on load. Then drag a slot onto another to swap, click one then a second to move it, or right-click a slot to load a new image into it. Works for walls, cap and nadir.

Only affects raw source. Fitted panels are already warped by GIMP — the slider is disabled for them so you compare like with like.

Polar wraps a radially-composed zenith render to the apex. Switch to flat for a uniform sky — no center sunburst.

Load a downward-looking ground render (name it “nadir”, “floor” or “ground”). Laid flat on the floor — uniform water reads naturally with no center distortion.

Build mode: all instruments visible. User mode hides the chrome for a clean walk-through — the seam and grid tools stay off.