Tooling

RawContent/World/Templates/Map3_cliff.legend.json

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+{
+  "_comment": "What each painted colour in Map3.jpg means. See README.md next to this file. Rates are rock uplift in mm/yr, and the number to think in is not the rate but the hillslope angle it fixes: at an 8 m cell and K 5e-5, tan(angle) = 2.5 x the rate, so 0.08 is 11 degrees on every divide and 0.25 is 32. Do not read internal/stats' \"plain below 0.1 mm/yr\" as terrain - it is a reporting bucket, and 0.1 mm/yr is hill country. `terrain plan` prints the angle and what it reads as for every class here.",
+  "image": "Map3.jpg",
+  "warn_distance": 60,
+  "classes": [
+    { "name": "ocean",    "rgb": [ 91, 175, 185], "sea": true, "depth_m": 512 },
+    { "name": "deep",     "rgb": [ 65, 165, 180], "sea": true, "depth_m": 512 },
+    { "name": "shelf",    "rgb": [153, 204, 221], "sea": true, "depth_m": 120 },
+    { "name": "surf",     "rgb": [221, 238, 238], "sea": true, "depth_m": 20 },
+
+    { "_comment_ice": "snow is display and material only - it changes no height and no pass reads it, it just stops the polar caps rendering as meadow. What makes the cap read as ice in the terrain is the detail block: an ice sheet has meltwater channels but not a dendritic bedrock gully network, so it gets almost no droplets. Uplift is low and the cap is still solved like any other land; a proper ice dome would be a stamp after the solve, the way the crater is.",
+      "name": "ice",      "derived": true, "rgb": [250, 250, 250], "uplift_mm_yr": 0.05, "k_mult": 1.0,
+      "snow": true, "lithology_mix": 0,
+      "detail": { "droplets_per_cell": 0.02, "strata_contrast": 0.15, "amplitude_m": [1, 3] } },
+
+    { "_comment_plain": "coastal_plain_km puts the range inland. For n=1 the uplift rate alone fixes the hillslope angle, so a uniformly painted island sits at the angle of repose right down to the water; this ramps the rate up from coastal_floor_mm_yr over the first few km so there is a plain in front of the range. It is the opt-in, explicit version of the taper D-52 removed - that one was hidden and went to zero at the waterline.",
+      "_comment_massif": "The massif is what makes this a landscape rather than a landmass. 0.08 mm/yr is an 11 degree hillslope, and before this block it was 11 degrees on every divide from the waterline to the summit, so the whole continent came out as continuous hill country with no flat ground anywhere on it. Now 0.08 is the rate a *hill mass* reaches and 0.012 - 1.7 degrees, a plain - is the ground between them, with a sixth of it standing up. That is the North European Plain with the Harz and the Ardennes in it, which is what a lowland is.",
+      "name": "lowland",  "rgb": [153, 204, 102], "uplift_mm_yr": 0.08, "k_mult": 1.0,
+      "massif": { "floor_mm_yr": 0.012, "fraction": 0.16 },
+      "coastal_plain_km": 1.0, "coastal_floor_mm_yr": 0.012 },
+
+    { "_comment_faults": "A fault is a difference in uplift rate across a line - steep on one side, gentle on the other - which erosion then carves into a scarp. It is what puts an escarpment and a straight fifteen-kilometre valley inside a range, and neither is something the painting can draw. throw_m is the total displacement over the whole run, so it is the height of the scarp the fault would build if nothing eroded it; per_1000km2 is a density over *this class*, which on this template is 549 km2 of highland, so 25 is about fourteen traces before the long ones step into segments. Drop the block to have none, which is what a plain should have.",
+      "name": "highland", "rgb": [ 68, 170, 102], "uplift_mm_yr": 0.25, "k_mult": 1.0,
+      "faults": { "per_1000km2": 25, "throw_m": [120, 400], "length_km": [6, 18] },
+      "_comment_clamped": "0.90 mm/yr is 66 degrees at a divide against a 35 degree angle of repose, so the repose clamp shapes this class rather than erosion does and the ground bakes out as flat polygonal facets. The ceiling is U = tan(talus)*K*cell = 0.280 mm/yr at an 8 m cell; `terrain plan` prints the angle for every class. Dropping to about 0.25 gives erosion-shaped mountains at roughly 350 m on a 20 km island instead of 695 m of talus - relief and steepness are the same knob at a fixed cell, so that is the trade.",
+      "_comment_massif": "A range is a belt, not a dome. Painted solid, this class used to raise every cell of an island to 32 degrees, which is why the first planet had two islands that were nothing but mountain. 0.25 is now the rate the belt reaches and 0.045 - 6.4 degrees, rolling - is its foreland, with three tenths of it standing up. It cuts the same fabric as the lowland beside it, so the hills in the neighbouring lowland are that orogen's outliers rather than an unrelated noise.",
+      "massif": { "floor_mm_yr": 0.045, "fraction": 0.30 },
+      "coastal_plain_km": 4.0, "coastal_floor_mm_yr": 0.03 },
+
+    { "_comment_desert": "A desert is not a low uplift rate - a wet lowland has one of those too - so at the geology grid it is only k_mult, which being below 1 means less water doing less work and therefore steeper, more angular ground held further from being worn down. What makes it read as desert is the detail block, at two metres: a fifth of the running water, so the dendritic gully network thins out to isolated wadis; twice the strata contrast, so mesas and ledges keep their edges because nothing is rounding them off; and several times the noise amplitude, which on flat ground is dune.",
+      "_comment_massif": "k_mult 0.5 doubles the angle a rate makes - tan(angle) = 2.5 x rate / k_mult - so 0.10 here is 27 degrees, not 14, and painted solid it made a plateau of mountain. 0.10 is the rate a mesa block reaches and 0.015 - 4.3 degrees - is the sand sea between them.",
+      "name": "desert",   "rgb": [238, 221, 153], "uplift_mm_yr": 0.10, "k_mult": 0.5,
+      "faults": { "per_1000km2": 10, "throw_m": [60, 220], "length_km": [5, 14] },
+      "massif": { "floor_mm_yr": 0.015, "fraction": 0.14 },
+      "coastal_plain_km": 0, "coastal_floor_mm_yr": 0.1,
+      "detail": { "droplets_per_cell": 0.035, "strata_contrast": 0.92, "amplitude_m": [7, 14] } },
+
+    { "_comment_crater": "An impact is an event, not a rate, so it is stamped onto the finished terrain after the solve rather than painted as uplift - a closed basin built out of negative uplift would be filled in by the priority-flood within a hundred steps. The shape comes from the painted blob: distance in from its own shoreline, normalised by its widest point, so rim_at and wall_at describe every crater whatever size it was drawn. The uplift rate here is only what the solve does to the flanks before the stamp lands, so it is low.",
+      "name": "crater",   "rgb": [124, 117, 111], "uplift_mm_yr": 0.15, "k_mult": 1.5,
+      "lithology_mix": 0,
+      "crater": { "rim_m": 340, "floor_m": 60, "rim_at": 0.30, "wall_at": 0.62 } },
+
+    { "_comment": "White is painted twice: the polar caps and the outline stroke around every island. The stroke owns the colour, because it is the one that has to be recognised wherever it appears; a white region touching the top or bottom row of the map is a cap and becomes ice instead. Everything else white dissolves into whichever real class is nearest.",
+      "name": "stroke",   "rgb": [238, 238, 238], "stroke": true, "edge_class": "ice" }
+  ]
+}