Light the campus at night #39

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opened 2026-10-17 20:41:07 +00:00 by sermuns · 0 comments

sermuns commented

2026-10-17 20:41:07 +00:00

Owner

The day/night cycle exists and is server-authoritative, and the campus has
105 highway=street_lamp nodes with real metadata (lamp_mount 104,
lamp_type 104, light:count 26) -- plus 603 ways tagged lit=yes and 156
lit=no.

Every one of those lamps is a PROP_LAMP, which is a 0.16 x 3.5 box. It emits
nothing. At night the campus is uniformly moonlit, which is atmospheric but wrong:
the parts of campus people actually walk at night are the lit ones, and the data
says which those are.

The interesting half is lit=yes on a way, not the lamp nodes. A lamp-less
stretch of road that is tagged lit=yes is lit by lamps that are not mapped, so
the way tag is the more reliable signal, and it is per-street rather than
per-post.

Lighting a whole street from the renderer side is not a point light budget --
that is a different feature with a real cost. The cheap version is that a lit
surface has a higher albedo at night, so the lit parts of the campus read as lit
without any light sources at all.

Not dependent on the shadow-map work, but interacts with it.

Related

#7 the existing lighting issue
#48 night is what it is for
#17 which stretches of road are lit

The day/night cycle exists and is server-authoritative, and the campus has **105 `highway=street_lamp` nodes** with real metadata (`lamp_mount` 104, `lamp_type` 104, `light:count` 26) -- plus **603 ways tagged `lit=yes`** and 156 `lit=no`. Every one of those lamps is a `PROP_LAMP`, which is a 0.16 x 3.5 box. It emits nothing. At night the campus is uniformly moonlit, which is atmospheric but wrong: the parts of campus people actually walk at night are the lit ones, and the data says which those are. The interesting half is `lit=yes` on a **way**, not the lamp nodes. A lamp-less stretch of road that is tagged `lit=yes` is lit by lamps that are not mapped, so the way tag is the more reliable signal, and it is per-street rather than per-post. Lighting a whole street from the renderer side is not a point light budget -- that is a different feature with a real cost. The cheap version is that a lit surface has a higher albedo at night, so the lit parts of the campus read as lit without any light sources at all. Not dependent on the shadow-map work, but interacts with it. --- **Related** - #7 the existing lighting issue - #48 night is what it is for - #17 which stretches of road are lit

sermuns referenced this issue

2026-10-17 20:43:49 +00:00

Paint the crossings #17

sermuns referenced this issue

2026-10-17 20:44:20 +00:00

Weather from Open-Meteo #47

sermuns referenced this issue

2026-10-17 20:44:22 +00:00

Rain and snow #48

sermuns referenced this issue

2026-10-17 20:44:29 +00:00

Revamped lighting #7