# miasma The standing air of a plague district. Slow domain-warped fbm shaped into a band: thick and rolling along the bottom edge of the quad, thinning to nothing at the top, so a strip laid across the street reads as fog lying IN it rather than as a rectangle of haze. The same shader draws the green miasma pooled in the street (`art.weather.miasma_low`), the pale fog that separates one parallax band from the next (`art.weather.haze_far`, `art.weather.haze_band`), and the smoke leaning off a chimney (`art.weather.smoke`). `fog_color.a` is the whole strip's weight and is what the nine bells raise; `top` is how high the fog stands.