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Biomes: Add vertical biome blend (#6853)

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Add 'vertical blend' parameter to biome registration that defines how
many nodes above the biome's 'y max' limit the blend will extend.
This commit is contained in:
Paramat 2018-01-04 23:10:55 +00:00 • committed by Loïc Blot
parent ff2ceed381
commit 549cfd9db8
4 changed files with 38 additions and 19 deletions
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37
src/mapgen/mg_biome.cpp
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@ -50,6 +50,7 @@ BiomeManager::BiomeManager(Server *server) :
b->y_max = MAX_MAP_GENERATION_LIMIT;
b->heat_point = 0.0;
b->humidity_point = 0.0;
b->vertical_blend = 0;
b->m_nodenames.emplace_back("mapgen_stone");
b->m_nodenames.emplace_back("mapgen_stone");
@ -201,25 +202,41 @@ Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, s16 y) const
Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) const
{
Biome *b, *biome_closest = NULL;
Biome *biome_closest = nullptr;
Biome *biome_closest_blend = nullptr;
float dist_min = FLT_MAX;
float dist_min_blend = FLT_MAX;
for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
b = (Biome *)m_bmgr->getRaw(i);
if (!b || y > b->y_max || y < b->y_min)
Biome *b = (Biome *)m_bmgr->getRaw(i);
if (!b || y > b->y_max + b->vertical_blend || y < b->y_min)
continue;
float d_heat = heat - b->heat_point;
float d_heat = heat - b->heat_point;
float d_humidity = humidity - b->humidity_point;
float dist = (d_heat * d_heat) +
(d_humidity * d_humidity);
if (dist < dist_min) {
dist_min = dist;
biome_closest = b;
float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
if (y <= b->y_max) { // Within y limits of biome b
if (dist < dist_min) {
dist_min = dist;
biome_closest = b;
}
} else if (dist < dist_min_blend) { // Blend area above biome b
dist_min_blend = dist;
biome_closest_blend = b;
}
}
return biome_closest ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
// Carefully tune pseudorandom seed variation to avoid single node dither
// and create larger scale blending patterns.
mysrand(y + (heat - humidity) * 2);
if (biome_closest_blend &&
myrand_range(0, biome_closest_blend->vertical_blend) >=
y - biome_closest_blend->y_max)
return biome_closest_blend;
return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);
}