click empty floor to add · drag a dot to move it · right-click a dot to delete · Del deletes the selected dot · Space save & next · E save as empty floor · N skip · ← → move about · F walk past frames already saved or skipped.
Skip stores nothing; saving empty states that this floor holds nothing to reach for, which is a label the model learns from. Amber dots are the model's guesses with their probability; blue are carried over from the frame before, jittered; green are yours. Moving any dot makes it green.