forked from mtcontrib/minetest-mod-snow
make mgv6 snow biome size configurable (currently just in the mapgen file) @Splizard, partially generated snow biomes could appear on maps because the perlin noise is different
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@ -14,7 +14,6 @@ local np_default = {
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local np_cold = {
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local np_cold = {
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offset = 0,
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offset = 0,
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scale = 1,
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scale = 1,
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spread = {x=150, y=150, z=150},
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seed = 112,
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seed = 112,
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octaves = 3,
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octaves = 3,
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persist = 0.5
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persist = 0.5
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@ -122,6 +121,27 @@ local function define_contents()
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replacements = snow.known_plants or {}
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replacements = snow.known_plants or {}
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end
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end
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-- perlin noise "hills" are not peaks but looking like sinus curve
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local function upper_rarity(rarity)
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return math.sign(rarity)*math.sin(math.abs(rarity)*math.pi/2)
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end
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local rarity = 18 --snow.mapgen_rarity
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local size = 210 --snow.mapgen_size
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local nosmooth_rarity = 1-rarity/50
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local perlin_scale = size*100/rarity
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np_cold.spread = {x=perlin_scale, y=perlin_scale, z=perlin_scale}
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local smooth_rarity_max, smooth_rarity_min, smooth_rarity_dif
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local smooth = snow.smooth_biomes
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if smooth then
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local smooth_trans_size = 4 --snow.smooth_trans_size
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smooth_rarity_max = upper_rarity(nosmooth_rarity+smooth_trans_size*2/perlin_scale)
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smooth_rarity_min = upper_rarity(nosmooth_rarity-smooth_trans_size/perlin_scale)
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smooth_rarity_dif = smooth_rarity_max-smooth_rarity_min
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end
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nosmooth_rarity = upper_rarity(nosmooth_rarity)
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minetest.register_on_generated(function(minp, maxp, seed)
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minetest.register_on_generated(function(minp, maxp, seed)
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local t1 = os.clock()
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local t1 = os.clock()
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@ -130,8 +150,6 @@ minetest.register_on_generated(function(minp, maxp, seed)
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local x1 = maxp.x
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local x1 = maxp.x
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local z1 = maxp.z
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local z1 = maxp.z
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local smooth = snow.smooth_biomes
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if not c then
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if not c then
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define_contents()
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define_contents()
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end
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end
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@ -163,6 +181,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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pr = PseudoRandom(seed+68)
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pr = PseudoRandom(seed+68)
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-- Loop through columns in chunk
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-- Loop through columns in chunk
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local smooth = smooth and not snowy
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local write_to_map = false
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local write_to_map = false
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local ni = 1
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local ni = 1
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for z = z0, z1 do
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for z = z0, z1 do
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@ -174,12 +193,15 @@ minetest.register_on_generated(function(minp, maxp, seed)
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nvals_cold = minetest.get_perlin_map(np_cold, chulens):get2dMap_flat({x=x0, y=z0})
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nvals_cold = minetest.get_perlin_map(np_cold, chulens):get2dMap_flat({x=x0, y=z0})
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end
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end
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test = math.min(nvals_cold[ni], 1)
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test = math.min(nvals_cold[ni], 1)
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if smooth
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if smooth then
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and not snowy then
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if test >= smooth_rarity_max
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if (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
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or (
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test > smooth_rarity_min
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and pr:next(1, 1000) <= ((test-smooth_rarity_min)/smooth_rarity_dif)*1000
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) then
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in_biome = true
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in_biome = true
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end
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end
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elseif test > 0.53 then
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elseif test > nosmooth_rarity then
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in_biome = true
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in_biome = true
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end
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end
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end
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end
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@ -187,7 +209,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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if not in_biome then
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if not in_biome then
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if alpine
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if alpine
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and test
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and test
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and test > 0.43 then
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and test > smooth_rarity_min then
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-- remove trees near alpine
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-- remove trees near alpine
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local ground_y = nil
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local ground_y = nil
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for y = maxp.y, minp.y, -1 do
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for y = maxp.y, minp.y, -1 do
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@ -235,7 +257,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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local ground_y
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local ground_y
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for y = maxp.y, minp.y, -1 do
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for y = maxp.y, minp.y, -1 do
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local nodid = data[area:index(x, y, z)]
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local nodid = data[area:index(x, y, z)]
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if nodid ~= c.air and nodid ~= c.ignore then
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if nodid ~= c.air then
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ground_y = y
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ground_y = y
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break
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break
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end
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end
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@ -247,7 +269,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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if c_ground == c.dirt_with_grass then
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if c_ground == c.dirt_with_grass then
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if alpine
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if alpine
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and test > 0.53 then
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and test > nosmooth_rarity then
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snow_tab[num] = {ground_y, z, x, test}
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snow_tab[num] = {ground_y, z, x, test}
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num = num+1
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num = num+1
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-- generate stone ground
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-- generate stone ground
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@ -268,7 +290,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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data[area:index(x, ground_y+1, z)] = c.dry_shrub
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data[area:index(x, ground_y+1, z)] = c.dry_shrub
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else
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else
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if snowy
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if snowy
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or test > 0.8 then
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or test > smooth_rarity_max then
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-- more, deeper snow
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-- more, deeper snow
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data[node] = c.snow_block
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data[node] = c.snow_block
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else
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else
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@ -416,7 +438,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
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local wsz, wsx
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local wsz, wsx
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for _,i in pairs(snow_tab) do
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for _,i in pairs(snow_tab) do
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local y,z,x,test = unpack(i)
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local y,z,x,test = unpack(i)
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test = (test-0.53)/0.47 -- /(1-0.53)
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test = (test-nosmooth_rarity)/(1-nosmooth_rarity) -- /(1-0.53)
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if test > 0 then
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if test > 0 then
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local maxh = math.floor(test*10)%10+1
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local maxh = math.floor(test*10)%10+1
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if maxh ~= 1 then
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if maxh ~= 1 then
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