3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include "util/numeric.h"
23 #include "mapgen_v5.h"
24 #include "mapgen_v6.h"
25 #include "mapgen_v7.h"
29 static NoiseParams nparams_caveliquids(0, 1, v3f(150.0, 150.0, 150.0), 776, 3, 0.6, 2.0);
33 //// CavesNoiseIntersection
36 CavesNoiseIntersection::CavesNoiseIntersection(
37 INodeDefManager *nodedef, BiomeManager *biomemgr, v3s16 chunksize,
38 NoiseParams *np_cave1, NoiseParams *np_cave2, s32 seed, float cave_width)
47 m_cave_width = cave_width;
49 m_ystride = m_csize.X;
50 m_zstride_1d = m_csize.X * (m_csize.Y + 1);
52 // Noises are created using 1-down overgeneration
53 // A Nx-by-1-by-Nz-sized plane is at the bottom of the desired for
54 // re-carving the solid overtop placed for blocking sunlight
55 noise_cave1 = new Noise(np_cave1, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
56 noise_cave2 = new Noise(np_cave2, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
60 CavesNoiseIntersection::~CavesNoiseIntersection()
67 void CavesNoiseIntersection::generateCaves(MMVManip *vm,
68 v3s16 nmin, v3s16 nmax, u8 *biomemap)
73 noise_cave1->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
74 noise_cave2->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
76 v3s16 em = vm->m_area.getExtent();
77 u32 index2d = 0; // Biomemap index
79 for (s16 z = nmin.Z; z <= nmax.Z; z++)
80 for (s16 x = nmin.X; x <= nmax.X; x++, index2d++) {
81 bool column_is_open = false; // Is column open to overground
82 bool is_under_river = false; // Is column under river water
83 bool is_under_tunnel = false; // Is tunnel or is under tunnel
84 // Indexes at column top
85 u32 vi = vm->m_area.index(x, nmax.Y, z);
86 u32 index3d = (z - nmin.Z) * m_zstride_1d + m_csize.Y * m_ystride +
87 (x - nmin.X); // 3D noise index
89 Biome *biome = (Biome *)m_bmgr->getRaw(biomemap[index2d]);
90 u16 depth_top = biome->depth_top;
91 u16 base_filler = depth_top + biome->depth_filler;
92 u16 depth_riverbed = biome->depth_riverbed;
94 // Don't excavate the overgenerated stone at nmax.Y + 1,
95 // this creates a 'roof' over the tunnel, preventing light in
96 // tunnels at mapchunk borders when generating mapchunks upwards.
97 // This 'roof' is removed when the mapchunk above is generated.
98 for (s16 y = nmax.Y; y >= nmin.Y - 1; y--,
100 vm->m_area.add_y(em, vi, -1)) {
102 content_t c = vm->m_data[vi].getContent();
103 if (c == CONTENT_AIR || c == biome->c_water_top ||
104 c == biome->c_water) {
105 column_is_open = true;
107 } else if (c == biome->c_river_water) {
108 column_is_open = true;
109 is_under_river = true;
113 float d1 = contour(noise_cave1->result[index3d]);
114 float d2 = contour(noise_cave2->result[index3d]);
116 if (d1 * d2 > m_cave_width && m_ndef->get(c).is_ground_content) {
117 // In tunnel and ground content, excavate
118 vm->m_data[vi] = MapNode(CONTENT_AIR);
119 is_under_tunnel = true;
120 } else if (column_is_open && is_under_tunnel &&
121 (c == biome->c_stone || c == biome->c_filler)) {
122 // Tunnel entrance floor, place biome surface nodes
123 if (is_under_river) {
124 if (nplaced < depth_riverbed) {
125 vm->m_data[vi] = MapNode(biome->c_riverbed);
128 // Disable top/filler placement
129 column_is_open = false;
130 is_under_river = false;
131 is_under_tunnel = false;
133 } else if (nplaced < depth_top) {
134 vm->m_data[vi] = MapNode(biome->c_top);
136 } else if (nplaced < base_filler) {
137 vm->m_data[vi] = MapNode(biome->c_filler);
140 // Disable top/filler placement
141 column_is_open = false;
142 is_under_tunnel = false;
145 // Not tunnel or tunnel entrance floor
146 column_is_open = false;
157 CavernsNoise::CavernsNoise(
158 INodeDefManager *nodedef, v3s16 chunksize, NoiseParams *np_cavern,
159 s32 seed, float cavern_limit, float cavern_taper, float cavern_threshold)
166 m_cavern_limit = cavern_limit;
167 m_cavern_taper = cavern_taper;
168 m_cavern_threshold = cavern_threshold;
170 m_ystride = m_csize.X;
171 m_zstride_1d = m_csize.X * (m_csize.Y + 1);
173 // Noise is created using 1-down overgeneration
174 // A Nx-by-1-by-Nz-sized plane is at the bottom of the desired for
175 // re-carving the solid overtop placed for blocking sunlight
176 noise_cavern = new Noise(np_cavern, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
178 c_water_source = m_ndef->getId("mapgen_water_source");
179 if (c_water_source == CONTENT_IGNORE)
180 c_water_source = CONTENT_AIR;
182 c_lava_source = m_ndef->getId("mapgen_lava_source");
183 if (c_lava_source == CONTENT_IGNORE)
184 c_lava_source = CONTENT_AIR;
188 CavernsNoise::~CavernsNoise()
194 bool CavernsNoise::generateCaverns(MMVManip *vm, v3s16 nmin, v3s16 nmax)
199 noise_cavern->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
201 // Cache cavern_amp values
202 float *cavern_amp = new float[m_csize.Y + 1];
203 u8 cavern_amp_index = 0; // Index zero at column top
204 for (s16 y = nmax.Y; y >= nmin.Y - 1; y--, cavern_amp_index++) {
205 cavern_amp[cavern_amp_index] =
206 MYMIN((m_cavern_limit - y) / (float)m_cavern_taper, 1.0f);
210 bool near_cavern = false;
211 v3s16 em = vm->m_area.getExtent();
214 for (s16 z = nmin.Z; z <= nmax.Z; z++)
215 for (s16 x = nmin.X; x <= nmax.X; x++, index2d++) {
216 // Reset cave_amp index to column top
217 cavern_amp_index = 0;
218 // Initial voxelmanip index at column top
219 u32 vi = vm->m_area.index(x, nmax.Y, z);
220 // Initial 3D noise index at column top
221 u32 index3d = (z - nmin.Z) * m_zstride_1d + m_csize.Y * m_ystride +
223 // Don't excavate the overgenerated stone at node_max.Y + 1,
224 // this creates a 'roof' over the cavern, preventing light in
225 // caverns at mapchunk borders when generating mapchunks upwards.
226 // This 'roof' is excavated when the mapchunk above is generated.
227 for (s16 y = nmax.Y; y >= nmin.Y - 1; y--,
228 index3d -= m_ystride,
229 vm->m_area.add_y(em, vi, -1),
230 cavern_amp_index++) {
231 content_t c = vm->m_data[vi].getContent();
232 float n_absamp_cavern = fabs(noise_cavern->result[index3d]) *
233 cavern_amp[cavern_amp_index];
234 // Disable CavesRandomWalk at a safe distance from caverns
235 // to avoid excessively spreading liquids in caverns.
236 if (n_absamp_cavern > m_cavern_threshold - 0.1f) {
238 if (n_absamp_cavern > m_cavern_threshold &&
239 m_ndef->get(c).is_ground_content)
240 vm->m_data[vi] = MapNode(CONTENT_AIR);
255 CavesRandomWalk::CavesRandomWalk(
256 INodeDefManager *ndef,
257 GenerateNotifier *gennotify,
260 content_t water_source,
261 content_t lava_source,
267 this->gennotify = gennotify;
269 this->water_level = water_level;
270 this->np_caveliquids = &nparams_caveliquids;
271 this->lava_depth = lava_depth;
273 c_water_source = water_source;
274 if (c_water_source == CONTENT_IGNORE)
275 c_water_source = ndef->getId("mapgen_water_source");
276 if (c_water_source == CONTENT_IGNORE)
277 c_water_source = CONTENT_AIR;
279 c_lava_source = lava_source;
280 if (c_lava_source == CONTENT_IGNORE)
281 c_lava_source = ndef->getId("mapgen_lava_source");
282 if (c_lava_source == CONTENT_IGNORE)
283 c_lava_source = CONTENT_AIR;
287 void CavesRandomWalk::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
288 PseudoRandom *ps, bool is_large_cave, int max_stone_height, s16 *heightmap)
295 this->node_min = nmin;
296 this->node_max = nmax;
297 this->heightmap = heightmap;
298 this->large_cave = is_large_cave;
300 this->ystride = nmax.X - nmin.X + 1;
302 // Set initial parameters from randomness
303 int dswitchint = ps->range(1, 14);
304 flooded = ps->range(1, 2) == 2;
307 part_max_length_rs = ps->range(2, 4);
308 tunnel_routepoints = ps->range(5, ps->range(15, 30));
309 min_tunnel_diameter = 5;
310 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
312 part_max_length_rs = ps->range(2, 9);
313 tunnel_routepoints = ps->range(10, ps->range(15, 30));
314 min_tunnel_diameter = 2;
315 max_tunnel_diameter = ps->range(2, 6);
318 large_cave_is_flat = (ps->range(0, 1) == 0);
320 main_direction = v3f(0, 0, 0);
322 // Allowed route area size in nodes
323 ar = node_max - node_min + v3s16(1, 1, 1);
324 // Area starting point in nodes
328 //(this should be more than the maximum radius of the tunnel)
329 const s16 insure = 10;
330 s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
331 ar += v3s16(1, 0, 1) * more * 2;
332 of -= v3s16(1, 0, 1) * more;
335 // Allow half a diameter + 7 over stone surface
336 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
338 // Limit maximum to area
339 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
343 if (node_min.Y < water_level && node_max.Y > water_level) {
344 minpos = water_level - max_tunnel_diameter / 3 - of.Y;
345 route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
347 route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
348 route_y_min = rangelim(route_y_min, 0, route_y_max);
351 s16 route_start_y_min = route_y_min;
352 s16 route_start_y_max = route_y_max;
354 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
355 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
357 // Randomize starting position
358 orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
359 orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
360 orp.X = (float)(ps->next() % ar.X) + 0.5f;
362 // Add generation notify begin event
364 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
365 GenNotifyType notifytype = large_cave ?
366 GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
367 gennotify->addEvent(notifytype, abs_pos);
370 // Generate some tunnel starting from orp
371 for (u16 j = 0; j < tunnel_routepoints; j++)
372 makeTunnel(j % dswitchint == 0);
374 // Add generation notify end event
376 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
377 GenNotifyType notifytype = large_cave ?
378 GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
379 gennotify->addEvent(notifytype, abs_pos);
384 void CavesRandomWalk::makeTunnel(bool dirswitch)
386 if (dirswitch && !large_cave) {
387 main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
388 main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
389 main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
391 main_direction *= (float)ps->range(0, 10) / 10;
395 s16 min_d = min_tunnel_diameter;
396 s16 max_d = max_tunnel_diameter;
397 rs = ps->range(min_d, max_d);
398 s16 rs_part_max_length_rs = rs * part_max_length_rs;
403 rs_part_max_length_rs,
404 rs_part_max_length_rs / 2,
405 rs_part_max_length_rs
409 rs_part_max_length_rs,
410 ps->range(1, rs_part_max_length_rs),
411 rs_part_max_length_rs
416 // Jump downward sometimes
417 if (!large_cave && ps->range(0, 12) == 0) {
418 vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
419 vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
420 vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
422 vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
423 vec.Y = (float)(ps->next() % (maxlen.Y * 1)) - (float)maxlen.Y / 2;
424 vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
427 // Do not make caves that are above ground.
428 // It is only necessary to check the startpoint and endpoint.
429 v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
430 v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
431 if (isPosAboveSurface(p1) || isPosAboveSurface(p2))
434 vec += main_direction;
439 else if (rp.X >= ar.X)
442 if (rp.Y < route_y_min)
444 else if (rp.Y >= route_y_max)
445 rp.Y = route_y_max - 1;
449 else if (rp.Z >= ar.Z)
454 float veclen = vec.getLength();
458 // Every second section is rough
459 bool randomize_xz = (ps->range(1, 2) == 1);
462 for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
463 carveRoute(vec, f, randomize_xz);
469 void CavesRandomWalk::carveRoute(v3f vec, float f, bool randomize_xz)
471 MapNode airnode(CONTENT_AIR);
472 MapNode waternode(c_water_source);
473 MapNode lavanode(c_lava_source);
475 v3s16 startp(orp.X, orp.Y, orp.Z);
478 float nval = NoisePerlin3D(np_caveliquids, startp.X,
479 startp.Y, startp.Z, seed);
480 MapNode liquidnode = (nval < 0.40f && node_max.Y < lava_depth) ?
481 lavanode : waternode;
483 v3f fp = orp + vec * f;
484 fp.X += 0.1f * ps->range(-10, 10);
485 fp.Z += 0.1f * ps->range(-10, 10);
486 v3s16 cp(fp.X, fp.Y, fp.Z);
491 d0 += ps->range(-1, 1);
492 d1 += ps->range(-1, 1);
495 bool flat_cave_floor = !large_cave && ps->range(0, 2) == 2;
497 for (s16 z0 = d0; z0 <= d1; z0++) {
498 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
499 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
500 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
502 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
504 for (s16 y0 = -si2; y0 <= si2; y0++) {
505 // Make better floors in small caves
506 if (flat_cave_floor && y0 <= -rs / 2 && rs <= 7)
509 if (large_cave_is_flat) {
510 // Make large caves not so tall
511 if (rs > 7 && abs(y0) >= rs / 3)
515 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
518 if (vm->m_area.contains(p) == false)
521 u32 i = vm->m_area.index(p);
522 content_t c = vm->m_data[i].getContent();
523 if (!ndef->get(c).is_ground_content)
527 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
528 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
530 if (flooded && full_ymin < water_level && full_ymax > water_level)
531 vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
532 else if (flooded && full_ymax < water_level)
533 vm->m_data[i] = (p.Y < startp.Y - 4) ? liquidnode : airnode;
535 vm->m_data[i] = airnode;
537 if (c == CONTENT_IGNORE)
540 vm->m_data[i] = airnode;
541 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
549 inline bool CavesRandomWalk::isPosAboveSurface(v3s16 p)
551 if (heightmap != NULL &&
552 p.Z >= node_min.Z && p.Z <= node_max.Z &&
553 p.X >= node_min.X && p.X <= node_max.X) {
554 u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
555 if (heightmap[index] < p.Y)
557 } else if (p.Y > water_level) {
569 CavesV6::CavesV6(INodeDefManager *ndef, GenerateNotifier *gennotify,
570 int water_level, content_t water_source, content_t lava_source)
575 this->gennotify = gennotify;
576 this->water_level = water_level;
578 c_water_source = water_source;
579 if (c_water_source == CONTENT_IGNORE)
580 c_water_source = ndef->getId("mapgen_water_source");
581 if (c_water_source == CONTENT_IGNORE)
582 c_water_source = CONTENT_AIR;
584 c_lava_source = lava_source;
585 if (c_lava_source == CONTENT_IGNORE)
586 c_lava_source = ndef->getId("mapgen_lava_source");
587 if (c_lava_source == CONTENT_IGNORE)
588 c_lava_source = CONTENT_AIR;
592 void CavesV6::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
593 PseudoRandom *ps, PseudoRandom *ps2,
594 bool is_large_cave, int max_stone_height, s16 *heightmap)
603 this->node_min = nmin;
604 this->node_max = nmax;
605 this->heightmap = heightmap;
606 this->large_cave = is_large_cave;
608 this->ystride = nmax.X - nmin.X + 1;
610 // Set initial parameters from randomness
611 min_tunnel_diameter = 2;
612 max_tunnel_diameter = ps->range(2, 6);
613 int dswitchint = ps->range(1, 14);
615 part_max_length_rs = ps->range(2, 4);
616 tunnel_routepoints = ps->range(5, ps->range(15, 30));
617 min_tunnel_diameter = 5;
618 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
620 part_max_length_rs = ps->range(2, 9);
621 tunnel_routepoints = ps->range(10, ps->range(15, 30));
623 large_cave_is_flat = (ps->range(0, 1) == 0);
625 main_direction = v3f(0, 0, 0);
627 // Allowed route area size in nodes
628 ar = node_max - node_min + v3s16(1, 1, 1);
629 // Area starting point in nodes
633 //(this should be more than the maximum radius of the tunnel)
634 const s16 max_spread_amount = MAP_BLOCKSIZE;
635 const s16 insure = 10;
636 s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
637 ar += v3s16(1, 0, 1) * more * 2;
638 of -= v3s16(1, 0, 1) * more;
641 // Allow half a diameter + 7 over stone surface
642 route_y_max = -of.Y + max_stone_height + max_tunnel_diameter / 2 + 7;
644 // Limit maximum to area
645 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
649 if (node_min.Y < water_level && node_max.Y > water_level) {
650 minpos = water_level - max_tunnel_diameter / 3 - of.Y;
651 route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
653 route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
654 route_y_min = rangelim(route_y_min, 0, route_y_max);
657 s16 route_start_y_min = route_y_min;
658 s16 route_start_y_max = route_y_max;
660 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
661 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
663 // Randomize starting position
664 orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
665 orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
666 orp.X = (float)(ps->next() % ar.X) + 0.5f;
668 // Add generation notify begin event
669 if (gennotify != NULL) {
670 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
671 GenNotifyType notifytype = large_cave ?
672 GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
673 gennotify->addEvent(notifytype, abs_pos);
676 // Generate some tunnel starting from orp
677 for (u16 j = 0; j < tunnel_routepoints; j++)
678 makeTunnel(j % dswitchint == 0);
680 // Add generation notify end event
681 if (gennotify != NULL) {
682 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
683 GenNotifyType notifytype = large_cave ?
684 GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
685 gennotify->addEvent(notifytype, abs_pos);
690 void CavesV6::makeTunnel(bool dirswitch)
692 if (dirswitch && !large_cave) {
693 main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
694 main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
695 main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
697 main_direction *= (float)ps->range(0, 10) / 10;
701 s16 min_d = min_tunnel_diameter;
702 s16 max_d = max_tunnel_diameter;
703 rs = ps->range(min_d, max_d);
704 s16 rs_part_max_length_rs = rs * part_max_length_rs;
709 rs_part_max_length_rs,
710 rs_part_max_length_rs / 2,
711 rs_part_max_length_rs
715 rs_part_max_length_rs,
716 ps->range(1, rs_part_max_length_rs),
717 rs_part_max_length_rs
722 vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
723 vec.Y = (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2;
724 vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
726 // Jump downward sometimes
727 if (!large_cave && ps->range(0, 12) == 0) {
728 vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
729 vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
730 vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
733 // Do not make caves that are entirely above ground, to fix shadow bugs
734 // caused by overgenerated large caves.
735 // It is only necessary to check the startpoint and endpoint.
736 v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
737 v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
739 // If startpoint and endpoint are above ground, disable placement of nodes
740 // in carveRoute while still running all PseudoRandom calls to ensure caves
741 // are consistent with existing worlds.
742 bool tunnel_above_ground =
743 p1.Y > getSurfaceFromHeightmap(p1) &&
744 p2.Y > getSurfaceFromHeightmap(p2);
746 vec += main_direction;
751 else if (rp.X >= ar.X)
754 if (rp.Y < route_y_min)
756 else if (rp.Y >= route_y_max)
757 rp.Y = route_y_max - 1;
761 else if (rp.Z >= ar.Z)
766 float veclen = vec.getLength();
767 // As odd as it sounds, veclen is *exactly* 0.0 sometimes, causing a FPE
771 // Every second section is rough
772 bool randomize_xz = (ps2->range(1, 2) == 1);
775 for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
776 carveRoute(vec, f, randomize_xz, tunnel_above_ground);
782 void CavesV6::carveRoute(v3f vec, float f, bool randomize_xz,
783 bool tunnel_above_ground)
785 MapNode airnode(CONTENT_AIR);
786 MapNode waternode(c_water_source);
787 MapNode lavanode(c_lava_source);
789 v3s16 startp(orp.X, orp.Y, orp.Z);
792 v3f fp = orp + vec * f;
793 fp.X += 0.1f * ps->range(-10, 10);
794 fp.Z += 0.1f * ps->range(-10, 10);
795 v3s16 cp(fp.X, fp.Y, fp.Z);
800 d0 += ps->range(-1, 1);
801 d1 += ps->range(-1, 1);
804 for (s16 z0 = d0; z0 <= d1; z0++) {
805 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
806 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
807 if (tunnel_above_ground)
810 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
811 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
812 for (s16 y0 = -si2; y0 <= si2; y0++) {
813 if (large_cave_is_flat) {
814 // Make large caves not so tall
815 if (rs > 7 && abs(y0) >= rs / 3)
819 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
822 if (vm->m_area.contains(p) == false)
825 u32 i = vm->m_area.index(p);
826 content_t c = vm->m_data[i].getContent();
827 if (!ndef->get(c).is_ground_content)
831 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
832 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
834 if (full_ymin < water_level && full_ymax > water_level) {
835 vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
836 } else if (full_ymax < water_level) {
837 vm->m_data[i] = (p.Y < startp.Y - 2) ? lavanode : airnode;
839 vm->m_data[i] = airnode;
842 if (c == CONTENT_IGNORE || c == CONTENT_AIR)
845 vm->m_data[i] = airnode;
846 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
854 inline s16 CavesV6::getSurfaceFromHeightmap(v3s16 p)
856 if (heightmap != NULL &&
857 p.Z >= node_min.Z && p.Z <= node_max.Z &&
858 p.X >= node_min.X && p.X <= node_max.X) {
859 u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
860 return heightmap[index];