mtcontrib/mapgen_rivers
1
0
Fork 0
mirror of https://gitlab.com/gaelysam/mapgen_rivers.git synced 2025-07-02 16:30:44 +02:00
Code Issues Projects Releases Wiki Activity

Added glaciers, and re-organized noise definitions

Browse Source
This commit is contained in:
Gael-de-Sailly
2020-05-24 11:38:47 +02:00
parent 625768f967
commit 6f43430574
4 changed files with 90 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
polygons.lua
View File

@ -74,9 +74,28 @@ local function river_width(flow)
return math.min(wfactor * flow ^ wpower, 1)
end
local noise_heat -- Need a large-scale noise here so no heat blend
local elevation_chill = mapgen_rivers.elevation_chill
local function get_temperature(x, y, z)
local pos = {x=x, y=z}
return noise_heat:get2d(pos) - y*elevation_chill
end
local glaciers = mapgen_rivers.glaciers
local glacier_factor = mapgen_rivers.glacier_factor
local init = false
-- On map generation, determine into which polygon every point (in 2D) will fall.
-- Also store polygon-specific data
local function make_polygons(minp, maxp)
if not init then
if glaciers then
noise_heat = minetest.get_perlin(mapgen_rivers.noise_params.heat)
end
init = true
end
local chulens = maxp.z - minp.z + 1
local polygons = {}
@ -141,7 +160,8 @@ local function make_polygons(minp, maxp)
end
end
polygon.dem = {dem[iA], dem[iB], dem[iC], dem[iD]}
local poly_dem = {dem[iA], dem[iB], dem[iC], dem[iD]}
polygon.dem = poly_dem
polygon.lake = math.min(lakes[iA], lakes[iB], lakes[iC], lakes[iD])
-- Now, rivers.
@ -150,6 +170,21 @@ local function make_polygons(minp, maxp)
local riverB = river_width(rivers[iB])
local riverC = river_width(rivers[iC])
local riverD = river_width(rivers[iD])
if glaciers then -- Widen the river
if get_temperature(poly_x[1]*blocksize, poly_dem[1], poly_z[1]*blocksize) < 0 then
riverA = math.min(riverA*glacier_factor, 1)
end
if get_temperature(poly_x[2]*blocksize, poly_dem[2], poly_z[2]*blocksize) < 0 then
riverB = math.min(riverB*glacier_factor, 1)
end
if get_temperature(poly_x[3]*blocksize, poly_dem[3], poly_z[3]*blocksize) < 0 then
riverC = math.min(riverC*glacier_factor, 1)
end
if get_temperature(poly_x[4]*blocksize, poly_dem[4], poly_z[4]*blocksize) < 0 then
riverD = math.min(riverD*glacier_factor, 1)
end
end
polygon.river_corners = {riverA, 1-riverB, 2-riverC, 1-riverD}
-- Flow directions