I decided to fiddle around with Minetest's Mapgen v7 for a day. I am fairly new to Minetest's community and wanted to learn how things work (code wise), so I have messed around, this being one of those things.
As it turns out, it's completely stone when you load a world with Mapgen v7 checked. So I fiddled around and ended up making it work using the Lua shit. Of course, anyone can do that, but I also changed around some stuff in the mapgen_v7.cpp file, and made things real sexy. So with some minor changes to the code, and a small folder in minetest_game, you could have Mapgen v7 working with some amazing modifications to it. It looks really beautiful, you should try it yourself. (Oh did I mention, I modified the caves too to be really beautiful and better looking as well?)
Here's how:
Get the source of Minetest, open up mapgen_v7.cpp and delete everything and replace it with this code (for Minetest 0.4.12)
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- Code: Select all
/*
Minetest
Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "mapgen.h"
#include "voxel.h"
#include "noise.h"
#include "mapblock.h"
#include "mapnode.h"
#include "map.h"
#include "content_sao.h"
#include "nodedef.h"
#include "voxelalgorithms.h"
#include "profiler.h"
#include "settings.h" // For g_settings
#include "main.h" // For g_profiler
#include "emerge.h"
#include "dungeongen.h"
#include "cavegen.h"
#include "treegen.h"
#include "mg_biome.h"
#include "mg_ore.h"
#include "mg_decoration.h"
#include "mapgen_v7.h"
FlagDesc flagdesc_mapgen_v7[] = {
{"mountains", MGV7_MOUNTAINS},
{"ridges", MGV7_RIDGES},
{NULL, 0}
};
///////////////////////////////////////////////////////////////////////////////
MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
: Mapgen(mapgenid, params, emerge)
{
this->m_emerge = emerge;
this->bmgr = emerge->biomemgr;
//// amount of elements to skip for the next index
//// for noise/height/biome maps (not vmanip)
this->ystride = csize.X;
this->zstride = csize.X * csize.Y;
this->biomemap = new u8[csize.X * csize.Z];
this->heightmap = new s16[csize.X * csize.Z];
this->ridge_heightmap = new s16[csize.X * csize.Z];
MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
this->spflags = sp->spflags;
//// Terrain noise
noise_terrain_base = new Noise(&sp->np_terrain_base, seed, csize.X, csize.Z);
noise_terrain_alt = new Noise(&sp->np_terrain_alt, seed, csize.X, csize.Z);
noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
noise_height_select = new Noise(&sp->np_height_select, seed, csize.X, csize.Z);
noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
noise_mount_height = new Noise(&sp->np_mount_height, seed, csize.X, csize.Z);
noise_ridge_uwater = new Noise(&sp->np_ridge_uwater, seed, csize.X, csize.Z);
//// 3d terrain noise
noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y, csize.Z);
noise_ridge = new Noise(&sp->np_ridge, seed, csize.X, csize.Y, csize.Z);
noise_cave1 = new Noise(&sp->np_cave1, seed, csize.X, csize.Y, csize.Z);
noise_cave2 = new Noise(&sp->np_cave2, seed, csize.X, csize.Y, csize.Z);
//// Biome noise
noise_heat = new Noise(¶ms->np_biome_heat, seed, csize.X, csize.Z);
noise_humidity = new Noise(¶ms->np_biome_humidity, seed, csize.X, csize.Z);
//// Resolve nodes to be used
INodeDefManager *ndef = emerge->ndef;
c_stone = ndef->getId("mapgen_stone");
c_dirt = ndef->getId("mapgen_dirt");
c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
c_sand = ndef->getId("mapgen_sand");
c_water_source = ndef->getId("mapgen_water_source");
c_lava_source = ndef->getId("mapgen_lava_source");
c_ice = ndef->getId("default:ice");
c_cobble = ndef->getId("mapgen_cobble");
c_desert_stone = ndef->getId("mapgen_desert_stone");
c_mossycobble = ndef->getId("mapgen_mossycobble");
c_sandbrick = ndef->getId("mapgen_sandstonebrick");
c_stair_cobble = ndef->getId("mapgen_stair_cobble");
c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
if (c_ice == CONTENT_IGNORE)
c_ice = CONTENT_AIR;
if (c_mossycobble == CONTENT_IGNORE)
c_mossycobble = c_cobble;
if (c_sandbrick == CONTENT_IGNORE)
c_sandbrick = c_desert_stone;
if (c_stair_cobble == CONTENT_IGNORE)
c_stair_cobble = c_cobble;
if (c_stair_sandstone == CONTENT_IGNORE)
c_stair_sandstone = c_sandbrick;
}
MapgenV7::~MapgenV7()
{
delete noise_terrain_base;
delete noise_terrain_persist;
delete noise_height_select;
delete noise_terrain_alt;
delete noise_filler_depth;
delete noise_mount_height;
delete noise_ridge_uwater;
delete noise_mountain;
delete noise_ridge;
delete noise_cave1;
delete noise_cave2;
delete noise_heat;
delete noise_humidity;
delete[] ridge_heightmap;
delete[] heightmap;
delete[] biomemap;
}
MapgenV7Params::MapgenV7Params()
{
spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
np_terrain_base = NoiseParams(4, 70, v3f(300, 300, 300), 82341, 6, 0.7, 2.0);
np_terrain_alt = NoiseParams(4, 25, v3f(600, 600, 600), 5934, 5, 0.6, 2.0);
np_terrain_persist = NoiseParams(0.6, 0.1, v3f(500, 500, 500), 539, 3, 0.6, 2.0);
np_height_select = NoiseParams(-0.5, 1, v3f(250, 250, 250), 4213, 5, 0.69, 2.0);
np_filler_depth = NoiseParams(0, 1.2, v3f(150, 150, 150), 261, 4, 0.7, 2.0);
np_mount_height = NoiseParams(100, 30, v3f(500, 500, 500), 72449, 4, 0.85, 2.0);
np_ridge_uwater = NoiseParams(0, 1, v3f(500, 500, 500), 85039, 4, 0.6, 2.0);
np_mountain = NoiseParams(-0.6, 1, v3f(250, 350, 250), 5333, 5, 0.85, 2.0);
np_ridge = NoiseParams(0, 1, v3f(100, 100, 100), 6467, 4, 0.85, 2.0);
np_cave1 = NoiseParams(0, 12, v3f(100, 100, 100), 52534, 4, 0.5, 2.0);
np_cave2 = NoiseParams(0, 12, v3f(100, 100, 100), 10325, 4, 0.5, 2.0);
}
void MapgenV7Params::readParams(const Settings *settings)
{
settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
settings->getNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->getNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->getNoiseParams("mgv7_np_height_select", np_height_select);
settings->getNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->getNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->getNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->getNoiseParams("mgv7_np_mountain", np_mountain);
settings->getNoiseParams("mgv7_np_ridge", np_ridge);
settings->getNoiseParams("mgv7_np_cave1", np_cave1);
settings->getNoiseParams("mgv7_np_cave2", np_cave2);
}
void MapgenV7Params::writeParams(Settings *settings) const
{
settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, (u32)-1);
settings->setNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->setNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->setNoiseParams("mgv7_np_height_select", np_height_select);
settings->setNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->setNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->setNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->setNoiseParams("mgv7_np_mountain", np_mountain);
settings->setNoiseParams("mgv7_np_ridge", np_ridge);
settings->setNoiseParams("mgv7_np_cave1", np_cave1);
settings->setNoiseParams("mgv7_np_cave2", np_cave2);
}
///////////////////////////////////////
int MapgenV7::getGroundLevelAtPoint(v2s16 p)
{
// Base terrain calculation
s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
// Ridge/river terrain calculation
float width = 0.2;
float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
// actually computing the depth of the ridge is much more expensive;
// if inside a river, simply guess
if (fabs(uwatern) <= width)
return water_level - 10;
// Mountain terrain calculation
int iters = 128; // don't even bother iterating more than 128 times..
while (iters--) {
//current point would have been air
if (!getMountainTerrainAtPoint(p.X, y, p.Y))
return y;
y++;
}
return y;
}
void MapgenV7::makeChunk(BlockMakeData *data)
{
// Pre-conditions
assert(data->vmanip);
assert(data->nodedef);
assert(data->blockpos_requested.X >= data->blockpos_min.X &&
data->blockpos_requested.Y >= data->blockpos_min.Y &&
data->blockpos_requested.Z >= data->blockpos_min.Z);
assert(data->blockpos_requested.X <= data->blockpos_max.X &&
data->blockpos_requested.Y <= data->blockpos_max.Y &&
data->blockpos_requested.Z <= data->blockpos_max.Z);
this->generating = true;
this->vm = data->vmanip;
this->ndef = data->nodedef;
//TimeTaker t("makeChunk");
v3s16 blockpos_min = data->blockpos_min;
v3s16 blockpos_max = data->blockpos_max;
node_min = blockpos_min * MAP_BLOCKSIZE;
node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
blockseed = getBlockSeed2(full_node_min, seed);
// Make some noise
calculateNoise();
// Generate base terrain, mountains, and ridges with initial heightmaps
s16 stone_surface_max_y = generateTerrain();
// Create heightmap
updateHeightmap(node_min, node_max);
// Create biomemap at heightmap surface
bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
noise_humidity->result, heightmap, biomemap);
// Actually place the biome-specific nodes
bool desert_stone = generateBiomes(noise_heat->result, noise_humidity->result);
if (flags & MG_CAVES)
generateCaves(stone_surface_max_y);
if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
DungeonParams dp;
dp.np_rarity = nparams_dungeon_rarity;
dp.np_density = nparams_dungeon_density;
dp.np_wetness = nparams_dungeon_wetness;
dp.c_water = c_water_source;
if (desert_stone) {
dp.c_cobble = c_sandbrick;
dp.c_moss = c_sandbrick; // should make this 'cracked sandstone' later
dp.c_stair = c_stair_sandstone;
dp.diagonal_dirs = true;
dp.mossratio = 0.0;
dp.holesize = v3s16(2, 3, 2);
dp.roomsize = v3s16(2, 5, 2);
dp.notifytype = GENNOTIFY_TEMPLE;
} else {
dp.c_cobble = c_cobble;
dp.c_moss = c_mossycobble;
dp.c_stair = c_stair_cobble;
dp.diagonal_dirs = false;
dp.mossratio = 3.0;
dp.holesize = v3s16(1, 2, 1);
dp.roomsize = v3s16(0, 0, 0);
dp.notifytype = GENNOTIFY_DUNGEON;
}
DungeonGen dgen(this, &dp);
dgen.generate(blockseed, full_node_min, full_node_max);
}
// Generate the registered decorations
m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
// Generate the registered ores
m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
// Sprinkle some dust on top after everything else was generated
dustTopNodes();
//printf("makeChunk: %dms\n", t.stop());
updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
if (flags & MG_LIGHT)
calcLighting(node_min, node_max);
//setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
// node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
this->generating = false;
}
void MapgenV7::calculateNoise()
{
//TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
int x = node_min.X;
int y = node_min.Y;
int z = node_min.Z;
noise_terrain_persist->perlinMap2D(x, z);
float *persistmap = noise_terrain_persist->result;
noise_terrain_base->perlinMap2D(x, z, persistmap);
noise_terrain_alt->perlinMap2D(x, z, persistmap);
noise_height_select->perlinMap2D(x, z);
if (flags & MG_CAVES) {
noise_cave1->perlinMap3D(x, y, z);
noise_cave2->perlinMap3D(x, y, z);
}
if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
noise_ridge->perlinMap3D(x, y, z);
noise_ridge_uwater->perlinMap2D(x, z);
}
if ((spflags & MGV7_MOUNTAINS) && node_max.Y >= 0) {
noise_mountain->perlinMap3D(x, y, z);
noise_mount_height->perlinMap2D(x, z);
}
if (node_max.Y >= water_level) {
noise_filler_depth->perlinMap2D(x, z);
noise_heat->perlinMap2D(x, z);
noise_humidity->perlinMap2D(x, z);
}
//printf("calculateNoise: %dus\n", t.stop());
}
Biome *MapgenV7::getBiomeAtPoint(v3s16 p)
{
float heat = NoisePerlin2D(&noise_heat->np, p.X, p.Z, seed);
float humidity = NoisePerlin2D(&noise_humidity->np, p.X, p.Z, seed);
s16 groundlevel = baseTerrainLevelAtPoint(p.X, p.Z);
return bmgr->getBiome(heat, humidity, groundlevel);
}
//needs to be updated
float MapgenV7::baseTerrainLevelAtPoint(int x, int z)
{
float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
hselect = rangelim(hselect, 0.0, 2.0);
float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
noise_terrain_base->np.persist = persist;
float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
noise_terrain_alt->np.persist = persist;
float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
if (height_alt > height_base)
return height_alt;
return (height_base * hselect) + (height_alt * (3.0 - hselect));
}
float MapgenV7::baseTerrainLevelFromMap(int index)
{
float hselect = rangelim(noise_height_select->result[index], 0.0, 2.0);
float height_base = noise_terrain_base->result[index];
float height_alt = noise_terrain_alt->result[index];
if (height_alt > height_base)
return height_alt;
return (height_base * hselect) + (height_alt * (3.0 - hselect));
}
bool MapgenV7::getMountainTerrainAtPoint(int x, int y, int z)
{
float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
return mnt_n * mnt_h_n >= (float)y;
}
bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, int y)
{
float mounthn = noise_mount_height->result[idx_xz];
float mountn = noise_mountain->result[idx_xyz];
return mountn * mounthn >= (float)y;
}
#if 0
void MapgenV7::carveRivers() {
MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
MapNode n_stone(c_stone);
u32 index = 0;
int river_depth = 4;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
float terrain_mod = noise_terrain_mod->result[index];
NoiseParams *np = noise_terrain_river->np;
np.persist = noise_terrain_persist->result[index];
float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
float height = terrain_river * (2 - abs(terrain_mod)) *
noise_terrain_river->np.scale;
height = log(height * height); //log(h^3) is pretty interesting for terrain
s16 y = heightmap[index];
if (height < 1.0 && y > river_depth &&
y - river_depth >= node_min.Y && y <= node_max.Y) {
for (s16 ry = y; ry != y - river_depth; ry--) {
u32 vi = vm->m_area.index(x, ry, z);
vm->m_data[vi] = n_air;
}
u32 vi = vm->m_area.index(x, y - river_depth, z);
vm->m_data[vi] = n_water_source;
}
}
}
#endif
int MapgenV7::generateTerrain()
{
int ymax = generateBaseTerrain();
if (spflags & MGV7_MOUNTAINS)
ymax = generateMountainTerrain(ymax);
if (spflags & MGV7_RIDGES)
generateRidgeTerrain();
return ymax;
}
int MapgenV7::generateBaseTerrain()
{
MapNode n_air(CONTENT_AIR);
MapNode n_stone(c_stone);
MapNode n_water(c_water_source);
int stone_surface_max_y = -MAP_GENERATION_LIMIT;
v3s16 em = vm->m_area.getExtent();
u32 index = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
float surface_height = baseTerrainLevelFromMap(index);
s16 surface_y = (s16)surface_height;
heightmap[index] = surface_y;
ridge_heightmap[index] = surface_y;
if (surface_y > stone_surface_max_y)
stone_surface_max_y = surface_y;
u32 i = vm->m_area.index(x, node_min.Y, z);
for (s16 y = node_min.Y; y <= node_max.Y; y++) {
if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
if (y <= surface_y)
vm->m_data[i] = n_stone;
else if (y <= water_level)
vm->m_data[i] = n_water;
else
vm->m_data[i] = n_air;
}
vm->m_area.add_y(em, i, 1);
}
}
return stone_surface_max_y;
}
int MapgenV7::generateMountainTerrain(int ymax)
{
if (node_max.Y < 0)
return ymax;
MapNode n_stone(c_stone);
u32 j = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 y = node_min.Y; y <= node_max.Y; y++) {
u32 vi = vm->m_area.index(node_min.X, y, z);
for (s16 x = node_min.X; x <= node_max.X; x++) {
int index = (z - node_min.Z) * csize.X + (x - node_min.X);
content_t c = vm->m_data[vi].getContent();
if (getMountainTerrainFromMap(j, index, y)
&& (c == CONTENT_AIR || c == c_water_source)) {
vm->m_data[vi] = n_stone;
if (y > ymax)
ymax = y;
}
vi++;
j++;
}
}
return ymax;
}
void MapgenV7::generateRidgeTerrain()
{
if (node_max.Y < water_level)
return;
MapNode n_water(c_water_source);
MapNode n_air(CONTENT_AIR);
u32 index = 0;
float width = 0.6; // TODO: figure out acceptable perlin noise values
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 y = node_min.Y; y <= node_max.Y; y++) {
u32 vi = vm->m_area.index(node_min.X, y, z);
for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
int j = (z - node_min.Z) * csize.X + (x - node_min.X);
if (heightmap[j] < water_level - 20)
continue;
float uwatern = noise_ridge_uwater->result[j] * 4;
if (fabs(uwatern) > width)
continue;
float altitude = y - water_level;
float height_mod = (altitude + 20) / 3.0;
float width_mod = width - fabs(uwatern);
float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 3.0;
if (nridge + width_mod * height_mod < 0.6)
continue;
if (y < ridge_heightmap[j])
ridge_heightmap[j] = y - 1;
vm->m_data[vi] = (y > water_level) ? n_air : n_water;
}
}
}
bool MapgenV7::generateBiomes(float *heat_map, float *humidity_map)
{
if (node_max.Y < water_level)
return false;
MapNode n_air(CONTENT_AIR);
MapNode n_stone(c_stone);
MapNode n_water(c_water_source);
v3s16 em = vm->m_area.getExtent();
u32 index = 0;
bool desert_stone = false;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
Biome *biome = NULL;
s16 dfiller = 0;
s16 y0_top = 0;
s16 y0_filler = 0;
s16 depth_water_top = 0;
s16 nplaced = 0;
u32 i = vm->m_area.index(x, node_max.Y, z);
content_t c_above = vm->m_data[i + em.X].getContent();
bool have_air = c_above == CONTENT_AIR;
for (s16 y = node_max.Y; y >= node_min.Y; y--) {
content_t c = vm->m_data[i].getContent();
// It could be the case that the elevation is equal to the chunk
// boundary, but the chunk above has not been generated yet
if (y == node_max.Y && c_above == CONTENT_IGNORE &&
y == heightmap[index] && c == c_stone) {
int j = (z - node_min.Z) * zstride +
(y - node_min.Y) * ystride +
(x - node_min.X);
have_air = !getMountainTerrainFromMap(j, index, y);
}
if (c != CONTENT_IGNORE && c != CONTENT_AIR && (y == node_max.Y || have_air)) {
biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
dfiller = biome->depth_filler + noise_filler_depth->result[index];
y0_top = biome->depth_top;
y0_filler = biome->depth_top + dfiller;
depth_water_top = biome->depth_water_top;
if (biome->c_stone == c_desert_stone)
desert_stone = true;
}
if (c == c_stone && have_air) {
content_t c_below = vm->m_data[i - em.X].getContent();
if (c_below != CONTENT_AIR) {
if (nplaced < y0_top) {
vm->m_data[i] = MapNode(biome->c_top);
nplaced++;
} else if (nplaced < y0_filler && nplaced >= y0_top) {
vm->m_data[i] = MapNode(biome->c_filler);
nplaced++;
} else if (c == c_stone) {
have_air = false;
nplaced = 0;
vm->m_data[i] = MapNode(biome->c_stone);
} else {
have_air = false;
nplaced = 0;
}
} else if (c == c_stone) {
have_air = false;
nplaced = 0;
vm->m_data[i] = MapNode(biome->c_stone);
}
} else if (c == c_stone) {
have_air = false;
nplaced = 0;
vm->m_data[i] = MapNode(biome->c_stone);
} else if (c == c_water_source) {
have_air = true;
nplaced = 0;
if (y > water_level - depth_water_top)
vm->m_data[i] = MapNode(biome->c_water_top);
else
vm->m_data[i] = MapNode(biome->c_water);
} else if (c == CONTENT_AIR) {
have_air = true;
nplaced = 0;
}
vm->m_area.add_y(em, i, -1);
}
}
return desert_stone;
}
void MapgenV7::dustTopNodes()
{
if (node_max.Y < water_level)
return;
v3s16 em = vm->m_area.getExtent();
u32 index = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
Biome *biome = (Biome *)bmgr->get(biomemap[index]);
if (biome->c_dust == CONTENT_IGNORE)
continue;
s16 y = node_max.Y;
u32 vi = vm->m_area.index(x, y, z);
for (; y >= node_min.Y; y--) {
if (vm->m_data[vi].getContent() != CONTENT_AIR)
break;
vm->m_area.add_y(em, vi, -1);
}
content_t c = vm->m_data[vi].getContent();
if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE) {
if (y == node_max.Y)
continue;
vm->m_area.add_y(em, vi, 1);
vm->m_data[vi] = MapNode(biome->c_dust);
}
}
}
#if 0
void MapgenV7::addTopNodes()
{
v3s16 em = vm->m_area.getExtent();
s16 ntopnodes;
u32 index = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
Biome *biome = bmgr->biomes[biomemap[index]];
//////////////////// First, add top nodes below the ridge
s16 y = ridge_heightmap[index];
// This cutoff is good enough, but not perfect.
// It will cut off potentially placed top nodes at chunk boundaries
if (y < node_min.Y)
continue;
if (y > node_max.Y) {
y = node_max.Y; // Let's see if we can still go downward anyway
u32 vi = vm->m_area.index(x, y, z);
content_t c = vm->m_data[vi].getContent();
if (ndef->get(c).walkable)
continue;
}
// N.B. It is necessary to search downward since ridge_heightmap[i]
// might not be the actual height, just the lowest part in the chunk
// where a ridge had been carved
u32 i = vm->m_area.index(x, y, z);
for (; y >= node_min.Y; y--) {
content_t c = vm->m_data[i].getContent();
if (ndef->get(c).walkable)
break;
vm->m_area.add_y(em, i, -1);
}
if (y != node_min.Y - 1 && y >= water_level) {
ridge_heightmap[index] = y; //update ridgeheight
ntopnodes = biome->top_depth;
for (; y <= node_max.Y && ntopnodes; y++) {
ntopnodes--;
vm->m_data[i] = MapNode(biome->c_top);
vm->m_area.add_y(em, i, 1);
}
// If dirt, grow grass on it.
if (y > water_level - 10 &&
vm->m_data[i].getContent() == CONTENT_AIR) {
vm->m_area.add_y(em, i, -1);
if (vm->m_data[i].getContent() == c_dirt)
vm->m_data[i] = MapNode(c_dirt_with_grass);
}
}
//////////////////// Now, add top nodes on top of the ridge
y = heightmap[index];
if (y > node_max.Y) {
y = node_max.Y; // Let's see if we can still go downward anyway
u32 vi = vm->m_area.index(x, y, z);
content_t c = vm->m_data[vi].getContent();
if (ndef->get(c).walkable)
continue;
}
i = vm->m_area.index(x, y, z);
for (; y >= node_min.Y; y--) {
content_t c = vm->m_data[i].getContent();
if (ndef->get(c).walkable)
break;
vm->m_area.add_y(em, i, -1);
}
if (y != node_min.Y - 1) {
ntopnodes = biome->top_depth;
// Let's see if we've already added it...
if (y == ridge_heightmap[index] + ntopnodes - 1)
continue;
for (; y <= node_max.Y && ntopnodes; y++) {
ntopnodes--;
vm->m_data[i] = MapNode(biome->c_top);
vm->m_area.add_y(em, i, 1);
}
// If dirt, grow grass on it.
if (y > water_level - 10 &&
vm->m_data[i].getContent() == CONTENT_AIR) {
vm->m_area.add_y(em, i, -1);
if (vm->m_data[i].getContent() == c_dirt)
vm->m_data[i] = MapNode(c_dirt_with_grass);
}
}
}
}
#endif
void MapgenV7::generateCaves(int max_stone_y)
{
if (max_stone_y >= node_min.Y) {
u32 index = 0;
u32 index2d = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++) {
for (s16 y = node_min.Y; y <= node_max.Y; y++) {
u32 i = vm->m_area.index(node_min.X, y, z);
for (s16 x = node_min.X; x <= node_max.X;
x++, i++, index++, index2d++) {
Biome *biome = (Biome *)bmgr->get(biomemap[index2d]);
content_t c = vm->m_data[i].getContent();
if (c == CONTENT_AIR || (y <= water_level &&
c != biome->c_stone && c != c_stone))
continue;
float d1 = contour(noise_cave1->result[index]);
float d2 = contour(noise_cave2->result[index]);
if (d1 * d2 > 0.3)
vm->m_data[i] = MapNode(CONTENT_AIR);
}
index2d -= ystride;
}
index2d += ystride;
}
}
PseudoRandom ps(blockseed + 21343);
u32 bruises_count = (ps.range(1, 5) == 1) ? ps.range(1, 2) : 0;
for (u32 i = 0; i < bruises_count; i++) {
CaveV7 cave(this, &ps);
cave.makeCave(node_min, node_max, max_stone_y);
}
}
Then open up cavegen.cpp, and delete everything and enter (for Minetest 0.4.12)
Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.
- Code: Select all
/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "util/numeric.h"
#include "map.h"
#include "mapgen.h"
#include "mapgen_v5.h"
#include "mapgen_v6.h"
#include "mapgen_v7.h"
#include "cavegen.h"
NoiseParams nparams_caveliquids(0, 1, v3f(150.0, 150.0, 150.0), 776, 3, 0.6, 2.0);
///////////////////////////////////////// Caves V5
CaveV5::CaveV5(MapgenV5 *mg, PseudoRandom *ps) {
this->mg = mg;
this->vm = mg->vm;
this->ndef = mg->ndef;
this->water_level = mg->water_level;
this->ps = ps;
this->c_water_source = mg->c_water_source;
this->c_lava_source = mg->c_lava_source;
this->c_ice = mg->c_ice;
this->np_caveliquids = &nparams_caveliquids;
dswitchint = ps->range(1, 14);
flooded = ps->range(1, 2) == 2;
part_max_length_rs = ps->range(2, 4);
tunnel_routepoints = ps->range(5, ps->range(15, 30));
min_tunnel_diameter = 5;
max_tunnel_diameter = ps->range(7, ps->range(8, 24));
large_cave_is_flat = (ps->range(0, 1) == 0);
}
void CaveV5::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height) {
node_min = nmin;
node_max = nmax;
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
ar = node_max - node_min + v3s16(1, 1, 1);
// Area starting point in nodes
of = node_min;
// Allow a bit more
//(this should be more than the maximum radius of the tunnel)
s16 insure = 10;
s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
ar += v3s16(1,0,1) * more * 2;
of -= v3s16(1,0,1) * more;
route_y_min = 0;
// Allow half a diameter + 7 over stone surface
route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 4 + 10;
// Limit maximum to area
route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
s16 min = 0;
if (node_min.Y < water_level && node_max.Y > water_level) {
min = water_level - max_tunnel_diameter/3 - of.Y;
route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
}
route_y_min = ps->range(min, min + max_tunnel_diameter);
route_y_min = rangelim(route_y_min, 0, route_y_max);
s16 route_start_y_min = route_y_min;
s16 route_start_y_max = route_y_max;
route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
// Randomize starting position
orp = v3f(
(float)(ps->next() % ar.X) + 0.5,
(float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
(float)(ps->next() % ar.Z) + 0.5
);
// Add generation notify begin event
v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
mg->gennotify.addEvent(notifytype, abs_pos);
// Generate some tunnel starting from orp
for (u16 j = 0; j < tunnel_routepoints; j++)
makeTunnel(j % dswitchint == 0);
// Add generation notify end event
abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
notifytype = GENNOTIFY_LARGECAVE_END;
mg->gennotify.addEvent(notifytype, abs_pos);
}
void CaveV5::makeTunnel(bool dirswitch) {
// Randomize size
s16 min_d = min_tunnel_diameter;
s16 max_d = max_tunnel_diameter;
rs = ps->range(min_d, max_d);
s16 rs_part_max_length_rs = rs * part_max_length_rs;
v3s16 maxlen;
maxlen = v3s16(
rs_part_max_length_rs,
rs_part_max_length_rs / 2,
rs_part_max_length_rs
);
v3f vec;
// Jump downward sometimes
vec = v3f(
(float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
(float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
(float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
);
// Do not make large caves that are above ground.
// It is only necessary to check the startpoint and endpoint.
v3s16 orpi(orp.X, orp.Y, orp.Z);
v3s16 veci(vec.X, vec.Y, vec.Z);
v3s16 p;
p = orpi + veci + of + rs / 2;
if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
s16 h = mg->heightmap[index];
if (h < p.Y)
return;
} else if (p.Y > water_level) {
return; // If it's not in our heightmap, use a simple heuristic
}
p = orpi + of + rs / 2;
if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
s16 h = mg->heightmap[index];
if (h < p.Y)
return;
} else if (p.Y > water_level) {
return;
}
vec += main_direction;
v3f rp = orp + vec;
if (rp.X < 0)
rp.X = 0;
else if (rp.X >= ar.X)
rp.X = ar.X - 1;
if (rp.Y < route_y_min)
rp.Y = route_y_min;
else if (rp.Y >= route_y_max)
rp.Y = route_y_max - 1;
if (rp.Z < 0)
rp.Z = 0;
else if (rp.Z >= ar.Z)
rp.Z = ar.Z - 1;
vec = rp - orp;
float veclen = vec.getLength();
if (veclen < 0.05)
veclen = 1.0;
// Every second section is rough
bool randomize_xz = (ps->range(1, 2) == 1);
// Make a ravine every once in a while if it's long enough
//float xylen = vec.X * vec.X + vec.Z * vec.Z;
//disable ravines for now
bool is_ravine = false; //(xylen > 500.0) && !large_cave && (ps->range(1, 8) == 1);
// Carve routes
for (float f = 0; f < 1.0; f += 1.0 / veclen)
carveRoute(vec, f, randomize_xz, is_ravine);
orp = rp;
}
void CaveV5::carveRoute(v3f vec, float f, bool randomize_xz, bool is_ravine) {
MapNode airnode(CONTENT_AIR);
MapNode waternode(c_water_source);
MapNode lavanode(c_lava_source);
v3s16 startp(orp.X, orp.Y, orp.Z);
startp += of;
float nval = NoisePerlin3D(np_caveliquids, startp.X,
startp.Y, startp.Z, mg->seed);
MapNode liquidnode = nval < 0.40 ? lavanode : waternode;
v3f fp = orp + vec * f;
fp.X += 0.1 * ps->range(-10, 10);
fp.Z += 0.1 * ps->range(-10, 10);
v3s16 cp(fp.X, fp.Y, fp.Z);
s16 d0 = -rs/2;
s16 d1 = d0 + rs;
if (randomize_xz) {
d0 += ps->range(-1, 1);
d1 += ps->range(-1, 1);
}
bool should_make_cave_hole = ps->range(1, 10) == 1;
for (s16 z0 = d0; z0 <= d1; z0++) {
s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
s16 maxabsxz = MYMAX(abs(x0), abs(z0));
s16 si2 = is_ravine ? MYMIN(ps->range(25, 26), ar.Y) :
rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
for (s16 y0 = -si2; y0 <= si2; y0++) {
if (large_cave_is_flat) {
// Make large caves not so tall
if (rs > 7 && abs(y0) >= rs / 3)
continue;
}
v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
p += of;
if (!is_ravine && mg->heightmap && should_make_cave_hole &&
p.X <= node_max.X && p.Z <= node_max.Z) {
int maplen = node_max.X - node_min.X + 1;
int idx = (p.Z - node_min.Z) * maplen + (p.X - node_min.X);
if (p.Y >= mg->heightmap[idx] - 2)
continue;
}
if (vm->m_area.contains(p) == false)
continue;
u32 i = vm->m_area.index(p);
// Don't replace air, water, lava, or ice
content_t c = vm->m_data[i].getContent();
if (!ndef->get(c).is_ground_content || c == CONTENT_AIR ||
c == c_water_source || c == c_lava_source || c == c_ice)
continue;
int full_ymin = node_min.Y - MAP_BLOCKSIZE;
int full_ymax = node_max.Y + MAP_BLOCKSIZE;
if (flooded && full_ymin < water_level && full_ymax > water_level)
vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
else if (flooded && full_ymax < water_level)
vm->m_data[i] = (p.Y < startp.Y - 4) ? liquidnode : airnode;
else
vm->m_data[i] = airnode;
}
}
}
}
///////////////////////////////////////// Caves V6
CaveV6::CaveV6(MapgenV6 *mg, PseudoRandom *ps, PseudoRandom *ps2, bool is_large_cave) {
this->mg = mg;
this->vm = mg->vm;
this->ndef = mg->ndef;
this->water_level = mg->water_level;
this->large_cave = is_large_cave;
this->ps = ps;
this->ps2 = ps2;
this->c_water_source = mg->c_water_source;
this->c_lava_source = mg->c_lava_source;
min_tunnel_diameter = 2;
max_tunnel_diameter = ps->range(2, 6);
dswitchint = ps->range(1, 14);
flooded = true;
if (large_cave) {
part_max_length_rs = ps->range(2,4);
tunnel_routepoints = ps->range(7, ps->range(15,30));
min_tunnel_diameter = 8;
max_tunnel_diameter = ps->range(7, ps->range(8,24));
} else {
part_max_length_rs = ps->range(2,9);
tunnel_routepoints = ps->range(10, ps->range(15,30));
}
large_cave_is_flat = (ps->range(0,1) == 0);
}
void CaveV6::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height) {
node_min = nmin;
node_max = nmax;
max_stone_y = max_stone_height;
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
ar = node_max - node_min + v3s16(1, 1, 1);
// Area starting point in nodes
of = node_min;
// Allow a bit more
//(this should be more than the maximum radius of the tunnel)
const s16 max_spread_amount = MAP_BLOCKSIZE;
s16 insure = 10;
s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
ar += v3s16(1,0,1) * more * 2;
of -= v3s16(1,0,1) * more;
route_y_min = 0;
// Allow half a diameter + 7 over stone surface
route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 10;
// Limit maximum to area
route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
if (large_cave) {
s16 min = 0;
if (node_min.Y < water_level && node_max.Y > water_level) {
min = water_level - max_tunnel_diameter/2 - of.Y;
route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
}
route_y_min = ps->range(min, min + max_tunnel_diameter);
route_y_min = rangelim(route_y_min, 0, route_y_max);
}
s16 route_start_y_min = route_y_min;
s16 route_start_y_max = route_y_max;
route_start_y_min = rangelim(route_start_y_min, 0, ar.Y-1);
route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y-1);
// Randomize starting position
orp = v3f(
(float)(ps->next() % ar.X) + 0.5,
(float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
(float)(ps->next() % ar.Z) + 0.5
);
// Add generation notify begin event
v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = large_cave ?
GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
mg->gennotify.addEvent(notifytype, abs_pos);
// Generate some tunnel starting from orp
for (u16 j = 0; j < tunnel_routepoints; j++)
makeTunnel(j % dswitchint == 0);
// Add generation notify end event
abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
notifytype = large_cave ?
GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
mg->gennotify.addEvent(notifytype, abs_pos);
}
void CaveV6::makeTunnel(bool dirswitch) {
if (dirswitch && !large_cave) {
main_direction = v3f(
((float)(ps->next() % 20) - (float)10) / 10,
((float)(ps->next() % 20) - (float)10) / 30,
((float)(ps->next() % 20) - (float)10) / 10
);
main_direction *= (float)ps->range(0, 10) / 10;
}
// Randomize size
s16 min_d = min_tunnel_diameter;
s16 max_d = max_tunnel_diameter;
rs = ps->range(min_d, max_d);
s16 rs_part_max_length_rs = rs * part_max_length_rs;
v3s16 maxlen;
if (large_cave) {
maxlen = v3s16(
rs_part_max_length_rs,
rs_part_max_length_rs / 2,
rs_part_max_length_rs
);
} else {
maxlen = v3s16(
rs_part_max_length_rs,
ps->range(1, rs_part_max_length_rs),
rs_part_max_length_rs
);
}
v3f vec(
(float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
(float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
(float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
);
// Jump downward sometimes
if (!large_cave && ps->range(0, 12) == 0) {
vec = v3f(
(float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
(float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y,
(float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
);
}
// Do not make large caves that are entirely above ground.
// It is only necessary to check the startpoint and endpoint.
if (large_cave) {
v3s16 orpi(orp.X, orp.Y, orp.Z);
v3s16 veci(vec.X, vec.Y, vec.Z);
s16 h1;
s16 h2;
v3s16 p1 = orpi + veci + of + rs / 2;
if (p1.Z >= node_min.Z && p1.Z <= node_max.Z &&
p1.X >= node_min.X && p1.X <= node_max.X) {
u32 index1 = (p1.Z - node_min.Z) * mg->ystride + (p1.X - node_min.X);
h1 = mg->heightmap[index1];
} else {
h1 = water_level; // If not in heightmap
}
v3s16 p2 = orpi + of + rs / 2;
if (p2.Z >= node_min.Z && p2.Z <= node_max.Z &&
p2.X >= node_min.X && p2.X <= node_max.X) {
u32 index2 = (p2.Z - node_min.Z) * mg->ystride + (p2.X - node_min.X);
h2 = mg->heightmap[index2];
} else {
h2 = water_level;
}
if (p1.Y > h1 && p2.Y > h2) // If startpoint and endpoint are above ground
return;
}
vec += main_direction;
v3f rp = orp + vec;
if (rp.X < 0)
rp.X = 0;
else if (rp.X >= ar.X)
rp.X = ar.X - 1;
if (rp.Y < route_y_min)
rp.Y = route_y_min;
else if (rp.Y >= route_y_max)
rp.Y = route_y_max - 1;
if (rp.Z < 0)
rp.Z = 0;
else if (rp.Z >= ar.Z)
rp.Z = ar.Z - 1;
vec = rp - orp;
float veclen = vec.getLength();
// As odd as it sounds, veclen is *exactly* 0.0 sometimes, causing a FPE
if (veclen < 0.05)
veclen = 1.0;
// Every second section is rough
bool randomize_xz = (ps2->range(1, 2) == 1);
// Carve routes
for (float f = 0; f < 1.0; f += 1.0 / veclen)
carveRoute(vec, f, randomize_xz);
orp = rp;
}
void CaveV6::carveRoute(v3f vec, float f, bool randomize_xz) {
MapNode airnode(CONTENT_AIR);
MapNode waternode(c_water_source);
MapNode lavanode(c_lava_source);
v3s16 startp(orp.X, orp.Y, orp.Z);
startp += of;
v3f fp = orp + vec * f;
fp.X += 0.1 * ps->range(-10, 10);
fp.Z += 0.1 * ps->range(-10, 10);
v3s16 cp(fp.X, fp.Y, fp.Z);
s16 d0 = -rs/2;
s16 d1 = d0 + rs;
if (randomize_xz) {
d0 += ps->range(-1, 1);
d1 += ps->range(-1, 1);
}
for (s16 z0 = d0; z0 <= d1; z0++) {
s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
s16 maxabsxz = MYMAX(abs(x0), abs(z0));
s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
for (s16 y0 = -si2; y0 <= si2; y0++) {
if (large_cave_is_flat) {
// Make large caves not so tall
if (rs > 7 && abs(y0) >= rs / 3)
continue;
}
v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
p += of;
if (vm->m_area.contains(p) == false)
continue;
u32 i = vm->m_area.index(p);
content_t c = vm->m_data[i].getContent();
if (!ndef->get(c).is_ground_content)
continue;
if (large_cave) {
int full_ymin = node_min.Y - MAP_BLOCKSIZE;
int full_ymax = node_max.Y + MAP_BLOCKSIZE;
if (flooded && full_ymin < water_level && full_ymax > water_level) {
vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
} else if (flooded && full_ymax < water_level) {
vm->m_data[i] = (p.Y < startp.Y - 2) ? lavanode : airnode;
} else {
vm->m_data[i] = airnode;
}
} else {
// Don't replace air or water or lava or ignore
if (c == CONTENT_IGNORE || c == CONTENT_AIR ||
c == c_water_source || c == c_lava_source)
continue;
vm->m_data[i] = airnode;
vm->m_flags[i] |= VMANIP_FLAG_CAVE;
}
}
}
}
}
///////////////////////////////////////// Caves V7
CaveV7::CaveV7(MapgenV7 *mg, PseudoRandom *ps) {
this->mg = mg;
this->vm = mg->vm;
this->ndef = mg->ndef;
this->water_level = mg->water_level;
this->ps = ps;
this->c_water_source = mg->c_water_source;
this->c_lava_source = mg->c_lava_source;
this->c_ice = mg->c_ice;
this->np_caveliquids = &nparams_caveliquids;
dswitchint = ps->range(1, 14);
flooded = ps->range(1, 2) == 2;
part_max_length_rs = ps->range(2, 4);
tunnel_routepoints = ps->range(5, ps->range(15, 30));
min_tunnel_diameter = 5;
max_tunnel_diameter = ps->range(7, ps->range(8, 24));
large_cave_is_flat = (ps->range(0, 1) == 0);
}
void CaveV7::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height) {
node_min = nmin;
node_max = nmax;
max_stone_y = max_stone_height;
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
ar = node_max - node_min + v3s16(1, 1, 1);
// Area starting point in nodes
of = node_min;
// Allow a bit more
//(this should be more than the maximum radius of the tunnel)
s16 insure = 10;
s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
ar += v3s16(1,0,1) * more * 2;
of -= v3s16(1,0,1) * more;
route_y_min = 0;
// Allow half a diameter + 7 over stone surface
route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
// Limit maximum to area
route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
s16 min = 0;
if (node_min.Y < water_level && node_max.Y > water_level) {
min = water_level - max_tunnel_diameter/3 - of.Y;
route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
}
route_y_min = ps->range(min, min + max_tunnel_diameter);
route_y_min = rangelim(route_y_min, 0, route_y_max);
s16 route_start_y_min = route_y_min;
s16 route_start_y_max = route_y_max;
route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
// Randomize starting position
orp = v3f(
(float)(ps->next() % ar.X) + 0.5,
(float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
(float)(ps->next() % ar.Z) + 0.5
);
// Add generation notify begin event
v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
mg->gennotify.addEvent(notifytype, abs_pos);
// Generate some tunnel starting from orp
for (u16 j = 0; j < tunnel_routepoints; j++)
makeTunnel(j % dswitchint == 0);
// Add generation notify end event
abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
notifytype = GENNOTIFY_LARGECAVE_END;
mg->gennotify.addEvent(notifytype, abs_pos);
}
void CaveV7::makeTunnel(bool dirswitch) {
// Randomize size
s16 min_d = min_tunnel_diameter;
s16 max_d = max_tunnel_diameter;
rs = ps->range(min_d, max_d);
s16 rs_part_max_length_rs = rs * part_max_length_rs;
v3s16 maxlen;
maxlen = v3s16(
rs_part_max_length_rs,
rs_part_max_length_rs / 2,
rs_part_max_length_rs
);
v3f vec;
// Jump downward sometimes
vec = v3f(
(float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
(float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
(float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
);
// Do not make large caves that are above ground.
// It is only necessary to check the startpoint and endpoint.
v3s16 orpi(orp.X, orp.Y, orp.Z);
v3s16 veci(vec.X, vec.Y, vec.Z);
v3s16 p;
p = orpi + veci + of + rs / 2;
if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
s16 h = mg->ridge_heightmap[index];
if (h < p.Y)
return;
} else if (p.Y > water_level) {
return; // If it's not in our heightmap, use a simple heuristic
}
p = orpi + of + rs / 2;
if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
s16 h = mg->ridge_heightmap[index];
if (h < p.Y)
return;
} else if (p.Y > water_level) {
return;
}
vec += main_direction;
v3f rp = orp + vec;
if (rp.X < 0)
rp.X = 0;
else if (rp.X >= ar.X)
rp.X = ar.X - 1;
if (rp.Y < route_y_min)
rp.Y = route_y_min;
else if (rp.Y >= route_y_max)
rp.Y = route_y_max - 1;
if (rp.Z < 0)
rp.Z = 0;
else if (rp.Z >= ar.Z)
rp.Z = ar.Z - 1;
vec = rp - orp;
float veclen = vec.getLength();
if (veclen < 0.05)
veclen = 1.0;
// Every second section is rough
bool randomize_xz = (ps->range(1, 2) == 1);
// Make a ravine every once in a while if it's long enough
//float xylen = vec.X * vec.X + vec.Z * vec.Z;
//disable ravines for now
bool is_ravine = false; //(xylen > 500.0) && !large_cave && (ps->range(1, 8) == 1);
// Carve routes
for (float f = 0; f < 1.0; f += 1.0 / veclen)
carveRoute(vec, f, randomize_xz, is_ravine);
orp = rp;
}
void CaveV7::carveRoute(v3f vec, float f, bool randomize_xz, bool is_ravine) {
MapNode airnode(CONTENT_AIR);
MapNode waternode(c_water_source);
MapNode lavanode(c_lava_source);
v3s16 startp(orp.X, orp.Y, orp.Z);
startp += of;
float nval = NoisePerlin3D(np_caveliquids, startp.X,
startp.Y, startp.Z, mg->seed);
MapNode liquidnode = (nval < 0.40 && node_max.Y < -256) ? lavanode : waternode;
v3f fp = orp + vec * f;
fp.X += 0.1 * ps->range(-10, 10);
fp.Z += 0.1 * ps->range(-10, 10);
v3s16 cp(fp.X, fp.Y, fp.Z);
s16 d0 = -rs/2;
s16 d1 = d0 + rs;
if (randomize_xz) {
d0 += ps->range(-1, 1);
d1 += ps->range(-1, 1);
}
bool should_make_cave_hole = ps->range(1, 10) == 1;
for (s16 z0 = d0; z0 <= d1; z0++) {
s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
s16 maxabsxz = MYMAX(abs(x0), abs(z0));
s16 si2 = is_ravine ? MYMIN(ps->range(25, 26), ar.Y) :
rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
for (s16 y0 = -si2; y0 <= si2; y0++) {
if (large_cave_is_flat) {
// Make large caves not so tall
if (rs > 7 && abs(y0) >= rs / 3)
continue;
}
v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
p += of;
if (!is_ravine && mg->heightmap && should_make_cave_hole &&
p.X <= node_max.X && p.Z <= node_max.Z) {
int maplen = node_max.X - node_min.X + 1;
int idx = (p.Z - node_min.Z) * maplen + (p.X - node_min.X);
if (p.Y >= mg->heightmap[idx] - 2)
continue;
}
if (vm->m_area.contains(p) == false)
continue;
u32 i = vm->m_area.index(p);
// Don't replace air, water, lava, or ice
content_t c = vm->m_data[i].getContent();
if (!ndef->get(c).is_ground_content || c == CONTENT_AIR ||
c == c_water_source || c == c_lava_source || c == c_ice)
continue;
int full_ymin = node_min.Y - MAP_BLOCKSIZE;
int full_ymax = node_max.Y + MAP_BLOCKSIZE;
if (flooded && full_ymin < water_level && full_ymax > water_level)
vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
else if (flooded && full_ymax < water_level)
vm->m_data[i] = (p.Y < startp.Y - 4) ? liquidnode : airnode;
else
vm->m_data[i] = airnode;
}
}
}
}
After that, you're all set for the C++ code, and now time for the lua part. Simply download this file, and drop the folder into minetest_game:
https://www.mediafire.com/?kf69mijvvlkulqr
And this mapgen can be seen in my in-development fork at http://github.com/blokel/blokel
Cheers.
