Drawn above the structure, in the "higher-object-under" RenderLayer. May be useful to correct problems with neighboring pipes overlapping the structure graphics.

Animation that is drawn on top of the structure when burning_cooldown is larger than 1. The animation alpha can be controlled by the energy source light intensity, depending on fire_flicker_enabled.

The secondary draw order of this is higher than the secondary draw order of fire_glow, so this is drawn above fire_glow.

Animation that is drawn on top of the structure when burning_cooldown is larger than 1. The animation alpha can be controlled by the energy source light intensity, depending on fire_glow_flicker_enabled.

The secondary draw order of this is lower than the secondary draw order of fire, so this is drawn below fire.