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 CavesRandomWalk::CavesRandomWalk(
158 INodeDefManager *ndef,
159 GenerateNotifier *gennotify,
162 content_t water_source,
163 content_t lava_source)
168 this->gennotify = gennotify;
170 this->water_level = water_level;
171 this->np_caveliquids = &nparams_caveliquids;
172 this->lava_depth = DEFAULT_LAVA_DEPTH;
174 c_water_source = water_source;
175 if (c_water_source == CONTENT_IGNORE)
176 c_water_source = ndef->getId("mapgen_water_source");
177 if (c_water_source == CONTENT_IGNORE)
178 c_water_source = CONTENT_AIR;
180 c_lava_source = lava_source;
181 if (c_lava_source == CONTENT_IGNORE)
182 c_lava_source = ndef->getId("mapgen_lava_source");
183 if (c_lava_source == CONTENT_IGNORE)
184 c_lava_source = CONTENT_AIR;
188 void CavesRandomWalk::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
189 PseudoRandom *ps, bool is_large_cave, int max_stone_height, s16 *heightmap)
196 this->node_min = nmin;
197 this->node_max = nmax;
198 this->heightmap = heightmap;
199 this->large_cave = is_large_cave;
201 this->ystride = nmax.X - nmin.X + 1;
203 // Set initial parameters from randomness
204 int dswitchint = ps->range(1, 14);
205 flooded = ps->range(1, 2) == 2;
208 part_max_length_rs = ps->range(2, 4);
209 tunnel_routepoints = ps->range(5, ps->range(15, 30));
210 min_tunnel_diameter = 5;
211 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
213 part_max_length_rs = ps->range(2, 9);
214 tunnel_routepoints = ps->range(10, ps->range(15, 30));
215 min_tunnel_diameter = 2;
216 max_tunnel_diameter = ps->range(2, 6);
219 large_cave_is_flat = (ps->range(0, 1) == 0);
221 main_direction = v3f(0, 0, 0);
223 // Allowed route area size in nodes
224 ar = node_max - node_min + v3s16(1, 1, 1);
225 // Area starting point in nodes
229 //(this should be more than the maximum radius of the tunnel)
230 const s16 insure = 10;
231 s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
232 ar += v3s16(1, 0, 1) * more * 2;
233 of -= v3s16(1, 0, 1) * more;
236 // Allow half a diameter + 7 over stone surface
237 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
239 // Limit maximum to area
240 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
244 if (node_min.Y < water_level && node_max.Y > water_level) {
245 minpos = water_level - max_tunnel_diameter / 3 - of.Y;
246 route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
248 route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
249 route_y_min = rangelim(route_y_min, 0, route_y_max);
252 s16 route_start_y_min = route_y_min;
253 s16 route_start_y_max = route_y_max;
255 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
256 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
258 // Randomize starting position
259 orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
260 orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
261 orp.X = (float)(ps->next() % ar.X) + 0.5f;
263 // Add generation notify begin event
265 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
266 GenNotifyType notifytype = large_cave ?
267 GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
268 gennotify->addEvent(notifytype, abs_pos);
271 // Generate some tunnel starting from orp
272 for (u16 j = 0; j < tunnel_routepoints; j++)
273 makeTunnel(j % dswitchint == 0);
275 // Add generation notify end event
277 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
278 GenNotifyType notifytype = large_cave ?
279 GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
280 gennotify->addEvent(notifytype, abs_pos);
285 void CavesRandomWalk::makeTunnel(bool dirswitch)
287 if (dirswitch && !large_cave) {
288 main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
289 main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
290 main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
292 main_direction *= (float)ps->range(0, 10) / 10;
296 s16 min_d = min_tunnel_diameter;
297 s16 max_d = max_tunnel_diameter;
298 rs = ps->range(min_d, max_d);
299 s16 rs_part_max_length_rs = rs * part_max_length_rs;
304 rs_part_max_length_rs,
305 rs_part_max_length_rs / 2,
306 rs_part_max_length_rs
310 rs_part_max_length_rs,
311 ps->range(1, rs_part_max_length_rs),
312 rs_part_max_length_rs
317 // Jump downward sometimes
318 if (!large_cave && ps->range(0, 12) == 0) {
319 vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
320 vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
321 vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
323 vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
324 vec.Y = (float)(ps->next() % (maxlen.Y * 1)) - (float)maxlen.Y / 2;
325 vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
328 // Do not make caves that are above ground.
329 // It is only necessary to check the startpoint and endpoint.
330 v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
331 v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
332 if (isPosAboveSurface(p1) || isPosAboveSurface(p2))
335 vec += main_direction;
340 else if (rp.X >= ar.X)
343 if (rp.Y < route_y_min)
345 else if (rp.Y >= route_y_max)
346 rp.Y = route_y_max - 1;
350 else if (rp.Z >= ar.Z)
355 float veclen = vec.getLength();
359 // Every second section is rough
360 bool randomize_xz = (ps->range(1, 2) == 1);
363 for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
364 carveRoute(vec, f, randomize_xz);
370 void CavesRandomWalk::carveRoute(v3f vec, float f, bool randomize_xz)
372 MapNode airnode(CONTENT_AIR);
373 MapNode waternode(c_water_source);
374 MapNode lavanode(c_lava_source);
376 v3s16 startp(orp.X, orp.Y, orp.Z);
379 float nval = NoisePerlin3D(np_caveliquids, startp.X,
380 startp.Y, startp.Z, seed);
381 MapNode liquidnode = (nval < 0.40f && node_max.Y < lava_depth) ?
382 lavanode : waternode;
384 v3f fp = orp + vec * f;
385 fp.X += 0.1f * ps->range(-10, 10);
386 fp.Z += 0.1f * ps->range(-10, 10);
387 v3s16 cp(fp.X, fp.Y, fp.Z);
392 d0 += ps->range(-1, 1);
393 d1 += ps->range(-1, 1);
396 bool flat_cave_floor = !large_cave && ps->range(0, 2) == 2;
398 for (s16 z0 = d0; z0 <= d1; z0++) {
399 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
400 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
401 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
403 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
405 for (s16 y0 = -si2; y0 <= si2; y0++) {
406 // Make better floors in small caves
407 if (flat_cave_floor && y0 <= -rs / 2 && rs <= 7)
410 if (large_cave_is_flat) {
411 // Make large caves not so tall
412 if (rs > 7 && abs(y0) >= rs / 3)
416 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
419 if (vm->m_area.contains(p) == false)
422 u32 i = vm->m_area.index(p);
423 content_t c = vm->m_data[i].getContent();
424 if (!ndef->get(c).is_ground_content)
428 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
429 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
431 if (flooded && full_ymin < water_level && full_ymax > water_level)
432 vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
433 else if (flooded && full_ymax < water_level)
434 vm->m_data[i] = (p.Y < startp.Y - 4) ? liquidnode : airnode;
436 vm->m_data[i] = airnode;
438 if (c == CONTENT_IGNORE)
441 vm->m_data[i] = airnode;
442 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
450 inline bool CavesRandomWalk::isPosAboveSurface(v3s16 p)
452 if (heightmap != NULL &&
453 p.Z >= node_min.Z && p.Z <= node_max.Z &&
454 p.X >= node_min.X && p.X <= node_max.X) {
455 u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
456 if (heightmap[index] < p.Y)
458 } else if (p.Y > water_level) {
470 CavesV6::CavesV6(INodeDefManager *ndef, GenerateNotifier *gennotify,
471 int water_level, content_t water_source, content_t lava_source)
476 this->gennotify = gennotify;
477 this->water_level = water_level;
479 c_water_source = water_source;
480 if (c_water_source == CONTENT_IGNORE)
481 c_water_source = ndef->getId("mapgen_water_source");
482 if (c_water_source == CONTENT_IGNORE)
483 c_water_source = CONTENT_AIR;
485 c_lava_source = lava_source;
486 if (c_lava_source == CONTENT_IGNORE)
487 c_lava_source = ndef->getId("mapgen_lava_source");
488 if (c_lava_source == CONTENT_IGNORE)
489 c_lava_source = CONTENT_AIR;
493 void CavesV6::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
494 PseudoRandom *ps, PseudoRandom *ps2,
495 bool is_large_cave, int max_stone_height, s16 *heightmap)
504 this->node_min = nmin;
505 this->node_max = nmax;
506 this->heightmap = heightmap;
507 this->large_cave = is_large_cave;
509 this->ystride = nmax.X - nmin.X + 1;
511 // Set initial parameters from randomness
512 min_tunnel_diameter = 2;
513 max_tunnel_diameter = ps->range(2, 6);
514 int dswitchint = ps->range(1, 14);
516 part_max_length_rs = ps->range(2, 4);
517 tunnel_routepoints = ps->range(5, ps->range(15, 30));
518 min_tunnel_diameter = 5;
519 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
521 part_max_length_rs = ps->range(2, 9);
522 tunnel_routepoints = ps->range(10, ps->range(15, 30));
524 large_cave_is_flat = (ps->range(0, 1) == 0);
526 main_direction = v3f(0, 0, 0);
528 // Allowed route area size in nodes
529 ar = node_max - node_min + v3s16(1, 1, 1);
530 // Area starting point in nodes
534 //(this should be more than the maximum radius of the tunnel)
535 const s16 max_spread_amount = MAP_BLOCKSIZE;
536 const s16 insure = 10;
537 s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
538 ar += v3s16(1, 0, 1) * more * 2;
539 of -= v3s16(1, 0, 1) * more;
542 // Allow half a diameter + 7 over stone surface
543 route_y_max = -of.Y + max_stone_height + max_tunnel_diameter / 2 + 7;
545 // Limit maximum to area
546 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
550 if (node_min.Y < water_level && node_max.Y > water_level) {
551 minpos = water_level - max_tunnel_diameter / 3 - of.Y;
552 route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
554 route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
555 route_y_min = rangelim(route_y_min, 0, route_y_max);
558 s16 route_start_y_min = route_y_min;
559 s16 route_start_y_max = route_y_max;
561 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
562 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
564 // Randomize starting position
565 orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
566 orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
567 orp.X = (float)(ps->next() % ar.X) + 0.5f;
569 // Add generation notify begin event
570 if (gennotify != NULL) {
571 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
572 GenNotifyType notifytype = large_cave ?
573 GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
574 gennotify->addEvent(notifytype, abs_pos);
577 // Generate some tunnel starting from orp
578 for (u16 j = 0; j < tunnel_routepoints; j++)
579 makeTunnel(j % dswitchint == 0);
581 // Add generation notify end event
582 if (gennotify != NULL) {
583 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
584 GenNotifyType notifytype = large_cave ?
585 GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
586 gennotify->addEvent(notifytype, abs_pos);
591 void CavesV6::makeTunnel(bool dirswitch)
593 if (dirswitch && !large_cave) {
594 main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
595 main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
596 main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
598 main_direction *= (float)ps->range(0, 10) / 10;
602 s16 min_d = min_tunnel_diameter;
603 s16 max_d = max_tunnel_diameter;
604 rs = ps->range(min_d, max_d);
605 s16 rs_part_max_length_rs = rs * part_max_length_rs;
610 rs_part_max_length_rs,
611 rs_part_max_length_rs / 2,
612 rs_part_max_length_rs
616 rs_part_max_length_rs,
617 ps->range(1, rs_part_max_length_rs),
618 rs_part_max_length_rs
623 vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
624 vec.Y = (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2;
625 vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
627 // Jump downward sometimes
628 if (!large_cave && ps->range(0, 12) == 0) {
629 vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
630 vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
631 vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
634 // Do not make caves that are entirely above ground, to fix shadow bugs
635 // caused by overgenerated large caves.
636 // It is only necessary to check the startpoint and endpoint.
637 v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
638 v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
640 // If startpoint and endpoint are above ground, disable placement of nodes
641 // in carveRoute while still running all PseudoRandom calls to ensure caves
642 // are consistent with existing worlds.
643 bool tunnel_above_ground =
644 p1.Y > getSurfaceFromHeightmap(p1) &&
645 p2.Y > getSurfaceFromHeightmap(p2);
647 vec += main_direction;
652 else if (rp.X >= ar.X)
655 if (rp.Y < route_y_min)
657 else if (rp.Y >= route_y_max)
658 rp.Y = route_y_max - 1;
662 else if (rp.Z >= ar.Z)
667 float veclen = vec.getLength();
668 // As odd as it sounds, veclen is *exactly* 0.0 sometimes, causing a FPE
672 // Every second section is rough
673 bool randomize_xz = (ps2->range(1, 2) == 1);
676 for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
677 carveRoute(vec, f, randomize_xz, tunnel_above_ground);
683 void CavesV6::carveRoute(v3f vec, float f, bool randomize_xz,
684 bool tunnel_above_ground)
686 MapNode airnode(CONTENT_AIR);
687 MapNode waternode(c_water_source);
688 MapNode lavanode(c_lava_source);
690 v3s16 startp(orp.X, orp.Y, orp.Z);
693 v3f fp = orp + vec * f;
694 fp.X += 0.1f * ps->range(-10, 10);
695 fp.Z += 0.1f * ps->range(-10, 10);
696 v3s16 cp(fp.X, fp.Y, fp.Z);
701 d0 += ps->range(-1, 1);
702 d1 += ps->range(-1, 1);
705 for (s16 z0 = d0; z0 <= d1; z0++) {
706 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
707 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
708 if (tunnel_above_ground)
711 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
712 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
713 for (s16 y0 = -si2; y0 <= si2; y0++) {
714 if (large_cave_is_flat) {
715 // Make large caves not so tall
716 if (rs > 7 && abs(y0) >= rs / 3)
720 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
723 if (vm->m_area.contains(p) == false)
726 u32 i = vm->m_area.index(p);
727 content_t c = vm->m_data[i].getContent();
728 if (!ndef->get(c).is_ground_content)
732 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
733 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
735 if (full_ymin < water_level && full_ymax > water_level) {
736 vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
737 } else if (full_ymax < water_level) {
738 vm->m_data[i] = (p.Y < startp.Y - 2) ? lavanode : airnode;
740 vm->m_data[i] = airnode;
743 if (c == CONTENT_IGNORE || c == CONTENT_AIR)
746 vm->m_data[i] = airnode;
747 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
755 inline s16 CavesV6::getSurfaceFromHeightmap(v3s16 p)
757 if (heightmap != NULL &&
758 p.Z >= node_min.Z && p.Z <= node_max.Z &&
759 p.X >= node_min.X && p.X <= node_max.X) {
760 u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
761 return heightmap[index];