# Convection (the FIRE_FIXTURE driver): no wind response in the heat
# channel (the manual 0.375 m/s sits below the wind_factor floor, so
# the field reads as calm), the brazier deposits 0.4 heat/s on its
# tile and the gas lamps 0.01/s on theirs. The channel equilibrates in
# ~6 sim-s (the mist band - days of calm change nothing past frame
# ~480): the brazier tile holds heat ~0.30 -> updraft ~31 px/s
# (~0.5 m/s), the lamp tile stays faint. The run ends before the
# downwind orb ignites (frame 1611 in this scene): the merged
# cluster's deposit spread is a different regime (fire-merge's lane).
# No input: the scene idles.
# frames: 1560
