h3cast Builds the Heroes III Spectator Mode the Game Never Had

Field notes

The system places one agent on each player’s machine, reads local game events, and merges those streams server-side rather than capturing video. Its director can select either player’s fog of war, both views, or a full-map view, while the same ordered event stream supports roughly 90 seconds of rewind during a live match. The page says players only enter a password and play, with no OBS or encoder required.