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authorParamat <paramat@users.noreply.github.com>2018-01-04 23:10:55 +0000
committerLoïc Blot <nerzhul@users.noreply.github.com>2018-01-05 00:10:55 +0100
commit549cfd9db80c858bdc8d23a237ea57ccf5f68400 (patch)
treef027da5fdacc905d5f5941aa645e68e5994adb51 /src/mapgen
parentff2ceed381f0f9c7da5e147cdb9abf0118804ed6 (diff)
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Biomes: Add vertical biome blend (#6853)
Add 'vertical blend' parameter to biome registration that defines how many nodes above the biome's 'y max' limit the blend will extend.
Diffstat (limited to 'src/mapgen')
-rw-r--r--src/mapgen/mg_biome.cpp37
-rw-r--r--src/mapgen/mg_biome.h1
2 files changed, 28 insertions, 10 deletions
diff --git a/src/mapgen/mg_biome.cpp b/src/mapgen/mg_biome.cpp
index 8dbb78e59..c3493a3d9 100644
--- a/src/mapgen/mg_biome.cpp
+++ b/src/mapgen/mg_biome.cpp
@@ -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);
}
diff --git a/src/mapgen/mg_biome.h b/src/mapgen/mg_biome.h
index f45238f28..0f3fd76a9 100644
--- a/src/mapgen/mg_biome.h
+++ b/src/mapgen/mg_biome.h
@@ -67,6 +67,7 @@ public:
s16 y_max;
float heat_point;
float humidity_point;
+ s16 vertical_blend;
virtual void resolveNodeNames();
};