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valleys_mapgen
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Bugfix (remove artifacts in underwater valleys) and small optimization.

master
Gael-de-Sailly 2018-10-14 15:12:01 +02:00
parent f066694f73
commit 9a672a7a2b
1 changed files with 8 additions and 9 deletions
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17
mapgen.lua
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@ -154,18 +154,17 @@ end
local function calculate_terrain_at_point(base_ground, v2, v3, v4, v5)
v2 = math.abs(v2) - river_size -- v2 is distance from a river, so I'd like a positive value.
local river = v2 < 0 -- the rivers are placed where v2 is negative, so where the original v2 value is close to zero.
if river then
local depth = river_depth * math.sqrt(1 - (v2 / river_size + 1) ^ 2) -- use the curve of the function −sqrt(1−x²) which modelizes a circle.
local mountain_ground = math.min(math.max(base_ground - depth, water_level - 6), base_ground)
-- base_ground - depth : height of the bottom of the river
-- water_level - 6 : don't make rivers below 6 nodes under the surface
return mountain_ground, 0, river, v2 -- slopes = 0 because noise #6 has not any influence on rivers
end
local valleys = v3 * (1 - math.exp(- (v2 / v4) ^ 2)) -- use the curve of the function 1−exp(−(x/a)²) to modelise valleys. Making "a" varying 0 < a ≤ 1 changes the shape of the valleys. Try it with a geometry software ! (here x = v2 and a = v4). This variable represents the height of the terrain, from the rivers.
local mountain_ground = base_ground + valleys -- approximate height of the terrain at this point (could be slightly modified by the 3D noise #6)
local slopes = v5 * valleys -- This variable represents the maximal influence of the noise #6 on the elevation. v5 is the rate of the height from rivers (variable "valleys") that is concerned.
if river then
local depth = river_depth * math.sqrt(1 - (v2 / river_size + 1) ^ 2) -- use the curve of the function −sqrt(1−x²) which modelizes a circle.
mountain_ground = math.min(math.max(base_ground - depth, water_level - 6), mountain_ground)
-- base_ground - depth : height of the bottom of the river
-- water_level - 6 : don't make rivers below 6 nodes under the surface
slopes = 0 -- noise #6 has not any influence on rivers
end
return mountain_ground, slopes, river, v2
end