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"
26 #include "mapgen_fractal.h"
29 NoiseParams nparams_caveliquids(0, 1, v3f(150.0, 150.0, 150.0), 776, 3, 0.6, 2.0);
32 ///////////////////////////////////////// Caves V5
35 CaveV5::CaveV5(MapgenV5 *mg, PseudoRandom *ps)
39 this->ndef = mg->ndef;
40 this->water_level = mg->water_level;
42 this->c_water_source = mg->c_water_source;
43 this->c_lava_source = mg->c_lava_source;
44 this->c_ice = mg->c_ice;
45 this->np_caveliquids = &nparams_caveliquids;
47 dswitchint = ps->range(1, 14);
48 flooded = ps->range(1, 2) == 2;
50 part_max_length_rs = ps->range(2, 4);
51 tunnel_routepoints = ps->range(5, ps->range(15, 30));
52 min_tunnel_diameter = 5;
53 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
55 large_cave_is_flat = (ps->range(0, 1) == 0);
59 void CaveV5::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
63 main_direction = v3f(0, 0, 0);
65 // Allowed route area size in nodes
66 ar = node_max - node_min + v3s16(1, 1, 1);
67 // Area starting point in nodes
71 //(this should be more than the maximum radius of the tunnel)
73 s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
74 ar += v3s16(1,0,1) * more * 2;
75 of -= v3s16(1,0,1) * more;
78 // Allow half a diameter + 7 over stone surface
79 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
81 // Limit maximum to area
82 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
85 if (node_min.Y < water_level && node_max.Y > water_level) {
86 min = water_level - max_tunnel_diameter/3 - of.Y;
87 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
89 route_y_min = ps->range(min, min + max_tunnel_diameter);
90 route_y_min = rangelim(route_y_min, 0, route_y_max);
92 s16 route_start_y_min = route_y_min;
93 s16 route_start_y_max = route_y_max;
95 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
96 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
98 // Randomize starting position
100 (float)(ps->next() % ar.X) + 0.5,
101 (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
102 (float)(ps->next() % ar.Z) + 0.5
105 // Add generation notify begin event
106 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
107 GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
108 mg->gennotify.addEvent(notifytype, abs_pos);
110 // Generate some tunnel starting from orp
111 for (u16 j = 0; j < tunnel_routepoints; j++)
112 makeTunnel(j % dswitchint == 0);
114 // Add generation notify end event
115 abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
116 notifytype = GENNOTIFY_LARGECAVE_END;
117 mg->gennotify.addEvent(notifytype, abs_pos);
121 void CaveV5::makeTunnel(bool dirswitch)
124 s16 min_d = min_tunnel_diameter;
125 s16 max_d = max_tunnel_diameter;
126 rs = ps->range(min_d, max_d);
127 s16 rs_part_max_length_rs = rs * part_max_length_rs;
131 rs_part_max_length_rs,
132 rs_part_max_length_rs / 2,
133 rs_part_max_length_rs
137 // Jump downward sometimes
139 (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
140 (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
141 (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
144 // Do not make caves that are above ground.
145 // It is only necessary to check the startpoint and endpoint.
146 v3s16 orpi(orp.X, orp.Y, orp.Z);
147 v3s16 veci(vec.X, vec.Y, vec.Z);
150 p = orpi + veci + of + rs / 2;
151 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
152 p.X >= node_min.X && p.X <= node_max.X) {
153 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
154 s16 h = mg->heightmap[index];
157 } else if (p.Y > water_level) {
158 return; // If it's not in our heightmap, use a simple heuristic
161 p = orpi + of + rs / 2;
162 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
163 p.X >= node_min.X && p.X <= node_max.X) {
164 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
165 s16 h = mg->heightmap[index];
168 } else if (p.Y > water_level) {
172 vec += main_direction;
177 else if (rp.X >= ar.X)
180 if (rp.Y < route_y_min)
182 else if (rp.Y >= route_y_max)
183 rp.Y = route_y_max - 1;
187 else if (rp.Z >= ar.Z)
192 float veclen = vec.getLength();
196 // Every second section is rough
197 bool randomize_xz = (ps->range(1, 2) == 1);
200 for (float f = 0; f < 1.0; f += 1.0 / veclen)
201 carveRoute(vec, f, randomize_xz);
207 void CaveV5::carveRoute(v3f vec, float f, bool randomize_xz)
209 MapNode airnode(CONTENT_AIR);
210 MapNode waternode(c_water_source);
211 MapNode lavanode(c_lava_source);
213 v3s16 startp(orp.X, orp.Y, orp.Z);
216 float nval = NoisePerlin3D(np_caveliquids, startp.X,
217 startp.Y, startp.Z, mg->seed);
218 MapNode liquidnode = nval < 0.40 ? lavanode : waternode;
220 v3f fp = orp + vec * f;
221 fp.X += 0.1 * ps->range(-10, 10);
222 fp.Z += 0.1 * ps->range(-10, 10);
223 v3s16 cp(fp.X, fp.Y, fp.Z);
228 d0 += ps->range(-1, 1);
229 d1 += ps->range(-1, 1);
232 for (s16 z0 = d0; z0 <= d1; z0++) {
233 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
234 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
235 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
237 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
239 for (s16 y0 = -si2; y0 <= si2; y0++) {
240 if (large_cave_is_flat) {
241 // Make large caves not so tall
242 if (rs > 7 && abs(y0) >= rs / 3)
246 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
249 if (vm->m_area.contains(p) == false)
252 u32 i = vm->m_area.index(p);
253 content_t c = vm->m_data[i].getContent();
254 if (!ndef->get(c).is_ground_content)
257 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
258 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
260 if (flooded && full_ymin < water_level &&
261 full_ymax > water_level)
262 vm->m_data[i] = (p.Y <= water_level) ?
264 else if (flooded && full_ymax < water_level)
265 vm->m_data[i] = (p.Y < startp.Y - 4) ?
266 liquidnode : airnode;
268 vm->m_data[i] = airnode;
275 ///////////////////////////////////////// Caves V6
278 CaveV6::CaveV6(MapgenV6 *mg, PseudoRandom *ps, PseudoRandom *ps2, bool is_large_cave)
282 this->ndef = mg->ndef;
283 this->water_level = mg->water_level;
284 this->large_cave = is_large_cave;
287 this->c_water_source = mg->c_water_source;
288 this->c_lava_source = mg->c_lava_source;
290 min_tunnel_diameter = 2;
291 max_tunnel_diameter = ps->range(2, 6);
292 dswitchint = ps->range(1, 14);
296 part_max_length_rs = ps->range(2,4);
297 tunnel_routepoints = ps->range(5, ps->range(15,30));
298 min_tunnel_diameter = 5;
299 max_tunnel_diameter = ps->range(7, ps->range(8,24));
301 part_max_length_rs = ps->range(2,9);
302 tunnel_routepoints = ps->range(10, ps->range(15,30));
305 large_cave_is_flat = (ps->range(0,1) == 0);
309 void CaveV6::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
313 max_stone_y = max_stone_height;
314 main_direction = v3f(0, 0, 0);
316 // Allowed route area size in nodes
317 ar = node_max - node_min + v3s16(1, 1, 1);
318 // Area starting point in nodes
322 //(this should be more than the maximum radius of the tunnel)
323 const s16 max_spread_amount = MAP_BLOCKSIZE;
325 s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
326 ar += v3s16(1,0,1) * more * 2;
327 of -= v3s16(1,0,1) * more;
330 // Allow half a diameter + 7 over stone surface
331 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
333 // Limit maximum to area
334 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
338 if (node_min.Y < water_level && node_max.Y > water_level) {
339 min = water_level - max_tunnel_diameter/3 - of.Y;
340 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
342 route_y_min = ps->range(min, min + max_tunnel_diameter);
343 route_y_min = rangelim(route_y_min, 0, route_y_max);
346 s16 route_start_y_min = route_y_min;
347 s16 route_start_y_max = route_y_max;
349 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y-1);
350 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y-1);
352 // Randomize starting position
354 (float)(ps->next() % ar.X) + 0.5,
355 (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
356 (float)(ps->next() % ar.Z) + 0.5
359 // Add generation notify begin event
360 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
361 GenNotifyType notifytype = large_cave ?
362 GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_BEGIN;
363 mg->gennotify.addEvent(notifytype, abs_pos);
365 // Generate some tunnel starting from orp
366 for (u16 j = 0; j < tunnel_routepoints; j++)
367 makeTunnel(j % dswitchint == 0);
369 // Add generation notify end event
370 abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
371 notifytype = large_cave ?
372 GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
373 mg->gennotify.addEvent(notifytype, abs_pos);
377 void CaveV6::makeTunnel(bool dirswitch)
379 if (dirswitch && !large_cave) {
380 main_direction = v3f(
381 ((float)(ps->next() % 20) - (float)10) / 10,
382 ((float)(ps->next() % 20) - (float)10) / 30,
383 ((float)(ps->next() % 20) - (float)10) / 10
385 main_direction *= (float)ps->range(0, 10) / 10;
389 s16 min_d = min_tunnel_diameter;
390 s16 max_d = max_tunnel_diameter;
391 rs = ps->range(min_d, max_d);
392 s16 rs_part_max_length_rs = rs * part_max_length_rs;
397 rs_part_max_length_rs,
398 rs_part_max_length_rs / 2,
399 rs_part_max_length_rs
403 rs_part_max_length_rs,
404 ps->range(1, rs_part_max_length_rs),
405 rs_part_max_length_rs
410 (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
411 (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
412 (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
415 // Jump downward sometimes
416 if (!large_cave && ps->range(0, 12) == 0) {
418 (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
419 (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y,
420 (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
424 // Do not make caves that are entirely above ground, to fix
425 // shadow bugs caused by overgenerated large caves.
426 // It is only necessary to check the startpoint and endpoint.
427 v3s16 orpi(orp.X, orp.Y, orp.Z);
428 v3s16 veci(vec.X, vec.Y, vec.Z);
432 v3s16 p1 = orpi + veci + of + rs / 2;
433 if (p1.Z >= node_min.Z && p1.Z <= node_max.Z &&
434 p1.X >= node_min.X && p1.X <= node_max.X) {
435 u32 index1 = (p1.Z - node_min.Z) * mg->ystride +
437 h1 = mg->heightmap[index1];
439 h1 = water_level; // If not in heightmap
442 v3s16 p2 = orpi + of + rs / 2;
443 if (p2.Z >= node_min.Z && p2.Z <= node_max.Z &&
444 p2.X >= node_min.X && p2.X <= node_max.X) {
445 u32 index2 = (p2.Z - node_min.Z) * mg->ystride +
447 h2 = mg->heightmap[index2];
452 // If startpoint and endpoint are above ground,
453 // disable placing of nodes in carveRoute while
454 // still running all pseudorandom calls to ensure
455 // caves consistent with existing worlds.
456 bool tunnel_above_ground = p1.Y > h1 && p2.Y > h2;
458 vec += main_direction;
463 else if (rp.X >= ar.X)
466 if (rp.Y < route_y_min)
468 else if (rp.Y >= route_y_max)
469 rp.Y = route_y_max - 1;
473 else if (rp.Z >= ar.Z)
478 float veclen = vec.getLength();
479 // As odd as it sounds, veclen is *exactly* 0.0 sometimes, causing a FPE
483 // Every second section is rough
484 bool randomize_xz = (ps2->range(1, 2) == 1);
487 for (float f = 0; f < 1.0; f += 1.0 / veclen)
488 carveRoute(vec, f, randomize_xz, tunnel_above_ground);
494 void CaveV6::carveRoute(v3f vec, float f, bool randomize_xz, bool tunnel_above_ground)
496 MapNode airnode(CONTENT_AIR);
497 MapNode waternode(c_water_source);
498 MapNode lavanode(c_lava_source);
500 v3s16 startp(orp.X, orp.Y, orp.Z);
503 v3f fp = orp + vec * f;
504 fp.X += 0.1 * ps->range(-10, 10);
505 fp.Z += 0.1 * ps->range(-10, 10);
506 v3s16 cp(fp.X, fp.Y, fp.Z);
511 d0 += ps->range(-1, 1);
512 d1 += ps->range(-1, 1);
515 for (s16 z0 = d0; z0 <= d1; z0++) {
516 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
517 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
518 if (tunnel_above_ground)
521 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
522 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
523 for (s16 y0 = -si2; y0 <= si2; y0++) {
524 if (large_cave_is_flat) {
525 // Make large caves not so tall
526 if (rs > 7 && abs(y0) >= rs / 3)
530 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
533 if (vm->m_area.contains(p) == false)
536 u32 i = vm->m_area.index(p);
537 content_t c = vm->m_data[i].getContent();
538 if (!ndef->get(c).is_ground_content)
542 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
543 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
545 if (flooded && full_ymin < water_level &&
546 full_ymax > water_level) {
547 vm->m_data[i] = (p.Y <= water_level) ?
549 } else if (flooded && full_ymax < water_level) {
550 vm->m_data[i] = (p.Y < startp.Y - 2) ?
553 vm->m_data[i] = airnode;
556 if (c == CONTENT_IGNORE || c == CONTENT_AIR)
559 vm->m_data[i] = airnode;
560 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
568 ///////////////////////////////////////// Caves V7
571 CaveV7::CaveV7(MapgenV7 *mg, PseudoRandom *ps)
575 this->ndef = mg->ndef;
576 this->water_level = mg->water_level;
578 this->c_water_source = mg->c_water_source;
579 this->c_lava_source = mg->c_lava_source;
580 this->c_ice = mg->c_ice;
581 this->np_caveliquids = &nparams_caveliquids;
583 dswitchint = ps->range(1, 14);
584 flooded = ps->range(1, 2) == 2;
586 part_max_length_rs = ps->range(2, 4);
587 tunnel_routepoints = ps->range(5, ps->range(15, 30));
588 min_tunnel_diameter = 5;
589 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
591 large_cave_is_flat = (ps->range(0, 1) == 0);
595 void CaveV7::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
599 max_stone_y = max_stone_height;
600 main_direction = v3f(0, 0, 0);
602 // Allowed route area size in nodes
603 ar = node_max - node_min + v3s16(1, 1, 1);
604 // Area starting point in nodes
608 //(this should be more than the maximum radius of the tunnel)
610 s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
611 ar += v3s16(1,0,1) * more * 2;
612 of -= v3s16(1,0,1) * more;
615 // Allow half a diameter + 7 over stone surface
616 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
618 // Limit maximum to area
619 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
622 if (node_min.Y < water_level && node_max.Y > water_level) {
623 min = water_level - max_tunnel_diameter/3 - of.Y;
624 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
626 route_y_min = ps->range(min, min + max_tunnel_diameter);
627 route_y_min = rangelim(route_y_min, 0, route_y_max);
629 s16 route_start_y_min = route_y_min;
630 s16 route_start_y_max = route_y_max;
632 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
633 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
635 // Randomize starting position
637 (float)(ps->next() % ar.X) + 0.5,
638 (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
639 (float)(ps->next() % ar.Z) + 0.5
642 // Add generation notify begin event
643 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
644 GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
645 mg->gennotify.addEvent(notifytype, abs_pos);
647 // Generate some tunnel starting from orp
648 for (u16 j = 0; j < tunnel_routepoints; j++)
649 makeTunnel(j % dswitchint == 0);
651 // Add generation notify end event
652 abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
653 notifytype = GENNOTIFY_LARGECAVE_END;
654 mg->gennotify.addEvent(notifytype, abs_pos);
658 void CaveV7::makeTunnel(bool dirswitch)
661 s16 min_d = min_tunnel_diameter;
662 s16 max_d = max_tunnel_diameter;
663 rs = ps->range(min_d, max_d);
664 s16 rs_part_max_length_rs = rs * part_max_length_rs;
668 rs_part_max_length_rs,
669 rs_part_max_length_rs / 2,
670 rs_part_max_length_rs
674 // Jump downward sometimes
676 (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
677 (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
678 (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
681 // Do not make caves that are above ground.
682 // It is only necessary to check the startpoint and endpoint.
683 v3s16 orpi(orp.X, orp.Y, orp.Z);
684 v3s16 veci(vec.X, vec.Y, vec.Z);
687 p = orpi + veci + of + rs / 2;
688 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
689 p.X >= node_min.X && p.X <= node_max.X) {
690 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
691 s16 h = mg->ridge_heightmap[index];
694 } else if (p.Y > water_level) {
695 return; // If it's not in our heightmap, use a simple heuristic
698 p = orpi + of + rs / 2;
699 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
700 p.X >= node_min.X && p.X <= node_max.X) {
701 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
702 s16 h = mg->ridge_heightmap[index];
705 } else if (p.Y > water_level) {
709 vec += main_direction;
714 else if (rp.X >= ar.X)
717 if (rp.Y < route_y_min)
719 else if (rp.Y >= route_y_max)
720 rp.Y = route_y_max - 1;
724 else if (rp.Z >= ar.Z)
729 float veclen = vec.getLength();
733 // Every second section is rough
734 bool randomize_xz = (ps->range(1, 2) == 1);
737 for (float f = 0; f < 1.0; f += 1.0 / veclen)
738 carveRoute(vec, f, randomize_xz);
744 void CaveV7::carveRoute(v3f vec, float f, bool randomize_xz)
746 MapNode airnode(CONTENT_AIR);
747 MapNode waternode(c_water_source);
748 MapNode lavanode(c_lava_source);
750 v3s16 startp(orp.X, orp.Y, orp.Z);
753 float nval = NoisePerlin3D(np_caveliquids, startp.X,
754 startp.Y, startp.Z, mg->seed);
755 MapNode liquidnode = (nval < 0.40 && node_max.Y < MGV7_LAVA_DEPTH) ?
756 lavanode : waternode;
758 v3f fp = orp + vec * f;
759 fp.X += 0.1 * ps->range(-10, 10);
760 fp.Z += 0.1 * ps->range(-10, 10);
761 v3s16 cp(fp.X, fp.Y, fp.Z);
766 d0 += ps->range(-1, 1);
767 d1 += ps->range(-1, 1);
770 for (s16 z0 = d0; z0 <= d1; z0++) {
771 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
772 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
773 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
775 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
777 for (s16 y0 = -si2; y0 <= si2; y0++) {
778 if (large_cave_is_flat) {
779 // Make large caves not so tall
780 if (rs > 7 && abs(y0) >= rs / 3)
784 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
787 if (vm->m_area.contains(p) == false)
790 u32 i = vm->m_area.index(p);
791 content_t c = vm->m_data[i].getContent();
792 if (!ndef->get(c).is_ground_content)
795 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
796 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
798 if (flooded && full_ymin < water_level &&
799 full_ymax > water_level)
800 vm->m_data[i] = (p.Y <= water_level) ?
802 else if (flooded && full_ymax < water_level)
803 vm->m_data[i] = (p.Y < startp.Y - 4) ?
804 liquidnode : airnode;
806 vm->m_data[i] = airnode;
813 ///////////////////////////////////////// Caves Fractal
816 CaveFractal::CaveFractal(MapgenFractal *mg, PseudoRandom *ps)
820 this->ndef = mg->ndef;
821 this->water_level = mg->water_level;
823 this->c_water_source = mg->c_water_source;
824 this->c_lava_source = mg->c_lava_source;
825 this->c_ice = mg->c_ice;
826 this->np_caveliquids = &nparams_caveliquids;
828 dswitchint = ps->range(1, 14);
829 flooded = ps->range(1, 2) == 2;
831 part_max_length_rs = ps->range(2, 4);
832 tunnel_routepoints = ps->range(5, ps->range(15, 30));
833 min_tunnel_diameter = 5;
834 max_tunnel_diameter = ps->range(7, ps->range(8, 24));
836 large_cave_is_flat = (ps->range(0, 1) == 0);
840 void CaveFractal::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
844 main_direction = v3f(0, 0, 0);
846 // Allowed route area size in nodes
847 ar = node_max - node_min + v3s16(1, 1, 1);
848 // Area starting point in nodes
852 //(this should be more than the maximum radius of the tunnel)
854 s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
855 ar += v3s16(1,0,1) * more * 2;
856 of -= v3s16(1,0,1) * more;
859 // Allow half a diameter + 7 over stone surface
860 route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
862 // Limit maximum to area
863 route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
866 if (node_min.Y < water_level && node_max.Y > water_level) {
867 min = water_level - max_tunnel_diameter/3 - of.Y;
868 route_y_max = water_level + max_tunnel_diameter/3 - of.Y;
870 route_y_min = ps->range(min, min + max_tunnel_diameter);
871 route_y_min = rangelim(route_y_min, 0, route_y_max);
873 s16 route_start_y_min = route_y_min;
874 s16 route_start_y_max = route_y_max;
876 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
877 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
879 // Randomize starting position
881 (float)(ps->next() % ar.X) + 0.5,
882 (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5,
883 (float)(ps->next() % ar.Z) + 0.5
886 // Add generation notify begin event
887 v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
888 GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
889 mg->gennotify.addEvent(notifytype, abs_pos);
891 // Generate some tunnel starting from orp
892 for (u16 j = 0; j < tunnel_routepoints; j++)
893 makeTunnel(j % dswitchint == 0);
895 // Add generation notify end event
896 abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
897 notifytype = GENNOTIFY_LARGECAVE_END;
898 mg->gennotify.addEvent(notifytype, abs_pos);
902 void CaveFractal::makeTunnel(bool dirswitch)
905 s16 min_d = min_tunnel_diameter;
906 s16 max_d = max_tunnel_diameter;
907 rs = ps->range(min_d, max_d);
908 s16 rs_part_max_length_rs = rs * part_max_length_rs;
912 rs_part_max_length_rs,
913 rs_part_max_length_rs / 2,
914 rs_part_max_length_rs
918 // Jump downward sometimes
920 (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2,
921 (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2,
922 (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2
925 // Do not make caves that are above ground.
926 // It is only necessary to check the startpoint and endpoint.
927 v3s16 orpi(orp.X, orp.Y, orp.Z);
928 v3s16 veci(vec.X, vec.Y, vec.Z);
931 p = orpi + veci + of + rs / 2;
932 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
933 p.X >= node_min.X && p.X <= node_max.X) {
934 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
935 s16 h = mg->heightmap[index];
938 } else if (p.Y > water_level) {
939 return; // If it's not in our heightmap, use a simple heuristic
942 p = orpi + of + rs / 2;
943 if (p.Z >= node_min.Z && p.Z <= node_max.Z &&
944 p.X >= node_min.X && p.X <= node_max.X) {
945 u32 index = (p.Z - node_min.Z) * mg->ystride + (p.X - node_min.X);
946 s16 h = mg->heightmap[index];
949 } else if (p.Y > water_level) {
953 vec += main_direction;
958 else if (rp.X >= ar.X)
961 if (rp.Y < route_y_min)
963 else if (rp.Y >= route_y_max)
964 rp.Y = route_y_max - 1;
968 else if (rp.Z >= ar.Z)
973 float veclen = vec.getLength();
977 // Every second section is rough
978 bool randomize_xz = (ps->range(1, 2) == 1);
981 for (float f = 0; f < 1.0; f += 1.0 / veclen)
982 carveRoute(vec, f, randomize_xz);
988 void CaveFractal::carveRoute(v3f vec, float f, bool randomize_xz)
990 MapNode airnode(CONTENT_AIR);
991 MapNode waternode(c_water_source);
992 MapNode lavanode(c_lava_source);
994 v3s16 startp(orp.X, orp.Y, orp.Z);
997 float nval = NoisePerlin3D(np_caveliquids, startp.X,
998 startp.Y, startp.Z, mg->seed);
999 MapNode liquidnode = (nval < 0.40 && node_max.Y < MGFRACTAL_LAVA_DEPTH) ?
1000 lavanode : waternode;
1002 v3f fp = orp + vec * f;
1003 fp.X += 0.1 * ps->range(-10, 10);
1004 fp.Z += 0.1 * ps->range(-10, 10);
1005 v3s16 cp(fp.X, fp.Y, fp.Z);
1010 d0 += ps->range(-1, 1);
1011 d1 += ps->range(-1, 1);
1014 for (s16 z0 = d0; z0 <= d1; z0++) {
1015 s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
1016 for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
1017 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
1019 s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
1021 for (s16 y0 = -si2; y0 <= si2; y0++) {
1022 if (large_cave_is_flat) {
1023 // Make large caves not so tall
1024 if (rs > 7 && abs(y0) >= rs / 3)
1028 v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
1031 if (vm->m_area.contains(p) == false)
1034 u32 i = vm->m_area.index(p);
1035 content_t c = vm->m_data[i].getContent();
1036 if (!ndef->get(c).is_ground_content)
1039 int full_ymin = node_min.Y - MAP_BLOCKSIZE;
1040 int full_ymax = node_max.Y + MAP_BLOCKSIZE;
1042 if (flooded && full_ymin < water_level &&
1043 full_ymax > water_level)
1044 vm->m_data[i] = (p.Y <= water_level) ?
1045 waternode : airnode;
1046 else if (flooded && full_ymax < water_level)
1047 vm->m_data[i] = (p.Y < startp.Y - 4) ?
1048 liquidnode : airnode;
1050 vm->m_data[i] = airnode;