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DramaticShape
64 lines
3.2 KiB
Lua
64 lines
3.2 KiB
Lua
-- What hangs in the air of each map.
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--
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-- One entry per map that has an ATMOSPHERE: a ground fog the scene shader
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-- folds every surface into, and volumetric god rays -- light let down
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-- through an INVISIBLE canopy hanging above the map's real geometry, as
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-- if the trees drawn are only the understorey of something taller. The
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-- rays are not placed: a per-pixel march (see ForestAtmos) reads the
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-- frame's own depth and the sun's own shadow map, so the beams stand
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-- exactly where light really breaks between the tree hulls, trees and
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-- characters carve dark columns through them, and a wind-blown leaf
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-- field at the canopy plane opens and closes them like foliage moving
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-- overhead. The light leans along the mod's fixed noon shear (the one
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-- light a canopy map ever gets -- see DayNight.CANOPY); only its COLOUR
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-- and STRENGTH follow the clock: gold spears of sun by day, silver moon
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-- rays after dark, pollen adrift in the day's beams and fireflies once
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-- they cool.
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--
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-- A map with no entry here has no atmosphere at all: no fog uniform is
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-- raised, no march runs, nothing is spent. That is the contract a new
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-- map opts into by adding a line, and what a stale entry degrades to if
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-- its map id ever stops existing.
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--
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-- The knobs, in world pixels unless said otherwise (a map cell is 16):
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--
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-- canopyY where the invisible canopy hangs. MUST clear the tallest
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-- real geometry under it (Viridian's carved tree hulls top
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-- at y = 32) -- a beam is alpha ZERO at this height and only
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-- fades in below it, so a canopy at or under the tree tops
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-- would cut every ray off before it cleared the leaves.
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-- fadeTo the height by which a descending ray reaches full strength.
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-- fog density how fast distance dissolves into the haze
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-- (1 - exp(-density * distance-past-start))
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-- start how many pixels out the dissolve begins
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-- heightK how quickly the fog thins with ALTITUDE
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-- (exp(-y * heightK): 0.02 halves it by y = 35)
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-- rays strength overall in-scatter gain on the march
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-- reach how far out the march walks, in world px
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-- motes count of pollen/dust flecks adrift in the daylight beams
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-- fireflies count of the night shift
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-- seed the xorshift seed the particle deal runs on
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--
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-- Two caveats for maps opting in later: the water pass has no fog term,
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-- so a lake under heavy haze stays clear-day sharp in its reflections;
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-- and the march runs after the water's mirror copy, so beams will not
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-- appear IN those reflections either. Neither can bite in a map without
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-- water.
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return {
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["VIRIDIAN_FOREST"] = {
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canopyY = 56,
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fadeTo = 28,
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fog = { density = 0.0045, start = 64, heightK = 0.02 },
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-- strength is calibrated against the march's real integral: the
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-- under-canopy stretch of an orbit ray is short and thinly dense, so
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-- the raw accumulation for a fully lit beam core is a few percent --
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-- this gain lands it near +0.3 on screen. Halve it for a whisper,
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-- double it for cathedral light.
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rays = { strength = 16, reach = 380 },
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motes = { count = 96 },
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fireflies = { count = 48 },
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seed = 0x51D,
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},
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}
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