-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathyocto_sceneio.cpp
2831 lines (2589 loc) · 106 KB
/
yocto_sceneio.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//
// Implementation for Yocto/Scene Input and Output functions.
//
//
// LICENSE:
//
// Copyright (c) 2016 -- 2020 Fabio Pellacini
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
//
// TODO: make_safe_name
// TODO: pbrt load/save ply
//
//
// TODO: update transforms -> should be compute transforms?
// TODO: update tesselation -> should be compute tesselation
// TODO: move out animation utilities
//
#include "yocto_sceneio.h"
#include <atomic>
#include <cassert>
#include <cctype>
#include <climits>
#include <cstdlib>
#include <deque>
#include <future>
#include <memory>
#include "ext/filesystem.hpp"
#include "ext/json.hpp"
#include "yocto_image.h"
#include "yocto_obj.h"
#include "yocto_pbrt.h"
#include "yocto_ply.h"
#include "yocto_shape.h"
namespace sfs = ghc::filesystem;
using namespace std::string_literals;
#include "ext/cgltf.h"
// -----------------------------------------------------------------------------
// ALIASES
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
// Namespace aliases
namespace yply = yocto::ply;
namespace yobj = yocto::obj;
namespace ypbrt = yocto::pbrt;
namespace yshp = yocto::shape;
namespace yimg = yocto::image;
// import math symbols for use
using math::abs;
using math::acos;
using math::atan2;
using math::clamp;
using math::cos;
using math::exp;
using math::fmod;
using math::invalidb3f;
using math::log;
using math::max;
using math::min;
using math::pow;
using math::sin;
using math::sqrt;
using math::tan;
using math::uint;
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// IMPLEMENTATION OF ANIMATION UTILITIES
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
// Find the first keyframe value that is greater than the argument.
inline int keyframe_index(const std::vector<float>& times, const float& time) {
for (auto i = 0; i < times.size(); i++)
if (times[i] > time) return i;
return (int)times.size();
}
// Evaluates a keyframed value using step interpolation.
template <typename T>
inline T keyframe_step(
const std::vector<float>& times, const std::vector<T>& vals, float time) {
if (time <= times.front()) return vals.front();
if (time >= times.back()) return vals.back();
time = clamp(time, times.front(), times.back() - 0.001f);
auto idx = keyframe_index(times, time);
return vals.at(idx - 1);
}
// Evaluates a keyframed value using linear interpolation.
template <typename T>
inline vec4f keyframe_slerp(const std::vector<float>& times,
const std::vector<vec4f>& vals, float time) {
if (time <= times.front()) return vals.front();
if (time >= times.back()) return vals.back();
time = clamp(time, times.front(), times.back() - 0.001f);
auto idx = keyframe_index(times, time);
auto t = (time - times.at(idx - 1)) / (times.at(idx) - times.at(idx - 1));
return slerp(vals.at(idx - 1), vals.at(idx), t);
}
// Evaluates a keyframed value using linear interpolation.
template <typename T>
inline T keyframe_linear(
const std::vector<float>& times, const std::vector<T>& vals, float time) {
if (time <= times.front()) return vals.front();
if (time >= times.back()) return vals.back();
time = clamp(time, times.front(), times.back() - 0.001f);
auto idx = keyframe_index(times, time);
auto t = (time - times.at(idx - 1)) / (times.at(idx) - times.at(idx - 1));
return vals.at(idx - 1) * (1 - t) + vals.at(idx) * t;
}
// Evaluates a keyframed value using Bezier interpolation.
template <typename T>
inline T keyframe_bezier(
const std::vector<float>& times, const std::vector<T>& vals, float time) {
if (time <= times.front()) return vals.front();
if (time >= times.back()) return vals.back();
time = clamp(time, times.front(), times.back() - 0.001f);
auto idx = keyframe_index(times, time);
auto t = (time - times.at(idx - 1)) / (times.at(idx) - times.at(idx - 1));
return interpolate_bezier(
vals.at(idx - 3), vals.at(idx - 2), vals.at(idx - 1), vals.at(idx), t);
}
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// SCENE STATS AND VALIDATION
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
std::vector<std::string> scene_stats(const scn::model* scene, bool verbose) {
auto accumulate = [](const auto& values, const auto& func) -> size_t {
auto sum = (size_t)0;
for (auto& value : values) sum += func(value);
return sum;
};
auto format = [](auto num) {
auto str = std::to_string(num);
while (str.size() < 13) str = " " + str;
return str;
};
auto format3 = [](auto num) {
auto str = std::to_string(num.x) + " " + std::to_string(num.y) + " " +
std::to_string(num.z);
while (str.size() < 13) str = " " + str;
return str;
};
auto bbox = compute_bounds(scene);
auto stats = std::vector<std::string>{};
stats.push_back("cameras: " + format(scene->cameras.size()));
stats.push_back("shapes: " + format(scene->shapes.size()));
stats.push_back("subdivs: " + format(scene->subdivs.size()));
stats.push_back("environments: " + format(scene->environments.size()));
stats.push_back("textures: " + format(scene->textures.size()));
stats.push_back(
"points: " + format(accumulate(scene->shapes,
[](auto shape) { return shape->points.size(); })));
stats.push_back(
"lines: " + format(accumulate(scene->shapes,
[](auto shape) { return shape->lines.size(); })));
stats.push_back("triangles: " +
format(accumulate(scene->shapes,
[](auto shape) { return shape->triangles.size(); })));
stats.push_back(
"quads: " + format(accumulate(scene->shapes,
[](auto shape) { return shape->quads.size(); })));
stats.push_back("sfvquads: " +
format(accumulate(scene->subdivs,
[](auto shape) { return shape->quadspos.size(); })));
stats.push_back(
"texels3b: " + format(accumulate(scene->textures, [](auto texture) {
return (size_t)texture->colorb.size().x *
(size_t)texture->colorb.size().x;
})));
stats.push_back(
"texels3f: " + format(accumulate(scene->textures, [](auto texture) {
return (size_t)texture->colorf.size().x *
(size_t)texture->colorf.size().y;
})));
stats.push_back(
"texels1b: " + format(accumulate(scene->textures, [](auto texture) {
return (size_t)texture->scalarb.size().x *
(size_t)texture->scalarb.size().x;
})));
stats.push_back(
"texels1f: " + format(accumulate(scene->textures, [](auto texture) {
return (size_t)texture->scalarf.size().x *
(size_t)texture->scalarf.size().y;
})));
stats.push_back("center: " + format3(center(bbox)));
stats.push_back("size: " + format3(size(bbox)));
return stats;
}
// Checks for validity of the scene->
std::vector<std::string> scene_validation(
const scn::model* scene, bool notextures) {
auto errs = std::vector<std::string>();
auto check_names = [&errs](const auto& vals, const std::string& base) {
auto used = std::unordered_map<std::string, int>();
used.reserve(vals.size());
for (auto& value : vals) used[value->name] += 1;
for (auto& [name, used] : used) {
if (name == "") {
errs.push_back("empty " + base + " name");
} else if (used > 1) {
errs.push_back("duplicated " + base + " name " + name);
}
}
};
auto check_empty_textures = [&errs](const std::vector<scn::texture*>& vals) {
for (auto value : vals) {
if (value->colorf.empty() && value->colorb.empty() &&
value->scalarf.empty() && value->scalarb.empty()) {
errs.push_back("empty texture " + value->name);
}
}
};
check_names(scene->cameras, "camera");
check_names(scene->shapes, "shape");
check_names(scene->subdivs, "subdiv");
check_names(scene->shapes, "instance");
check_names(scene->shapes, "object");
check_names(scene->textures, "texture");
check_names(scene->environments, "environment");
if (!notextures) check_empty_textures(scene->textures);
return errs;
}
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// SCENE UTILITIES
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
model::~model() {
for (auto camera : cameras) delete camera;
for (auto shape : shapes) delete shape;
for (auto subdiv : subdivs) delete subdiv;
for (auto material : materials) delete material;
for (auto instance : instances) delete instance;
for (auto object : objects) delete object;
for (auto texture : textures) delete texture;
for (auto environment : environments) delete environment;
}
// add an element
template <typename T>
static T* add_element(std::vector<T*>& elements, const std::string& name,
const std::string& base) {
auto element = elements.emplace_back(new T{});
element->name = name != "" ? name : (base + std::to_string(elements.size()));
return element;
}
// add element
scn::camera* add_camera(scn::model* scene, const std::string& name) {
return add_element(scene->cameras, name, "camera");
}
scn::environment* add_environment(scn::model* scene, const std::string& name) {
return add_element(scene->environments, name, "environment");
}
scn::shape* add_shape(scn::model* scene, const std::string& name) {
return add_element(scene->shapes, name, "shape");
}
scn::subdiv* add_subdiv(scn::model* scene, const std::string& name) {
return add_element(scene->subdivs, name, "subdiv");
}
scn::texture* add_texture(scn::model* scene, const std::string& name) {
return add_element(scene->textures, name, "texture");
}
scn::object* add_object(scn::model* scene, const std::string& name) {
return add_element(scene->objects, name, "object");
}
scn::instance* add_instance(scn::model* scene, const std::string& name) {
return add_element(scene->instances, name, "instance");
}
scn::material* add_material(scn::model* scene, const std::string& name) {
return add_element(scene->materials, name, "material");
}
scn::object* add_complete_object(scn::model* scene, const std::string& name) {
auto object = add_object(scene, name);
object->shape = add_shape(scene, name);
object->material = add_material(scene, name);
return object;
}
// get named camera or default if camera is empty
scn::camera* get_camera(const scn::model* scene, const std::string& name) {
if (scene->cameras.empty()) return nullptr;
for (auto camera : scene->cameras) {
if (camera->name == name) return camera;
}
for (auto camera : scene->cameras) {
if (camera->name == "default") return camera;
}
for (auto camera : scene->cameras) {
if (camera->name == "camera") return camera;
}
for (auto camera : scene->cameras) {
if (camera->name == "camera1") return camera;
}
return scene->cameras.front();
}
// Updates the scene and scene's instances bounding boxes
bbox3f compute_bounds(const scn::model* scene) {
auto shape_bbox = std::unordered_map<scn::shape*, bbox3f>{};
auto bbox = invalidb3f;
for (auto shape : scene->shapes) {
auto sbvh = invalidb3f;
for (auto p : shape->positions) sbvh = merge(sbvh, p);
shape_bbox[shape] = sbvh;
}
for (auto object : scene->objects) {
if (object->instance) {
for (auto& frame : object->instance->frames) {
auto sbvh = shape_bbox[object->shape];
bbox = merge(bbox, transform_bbox(frame * object->frame, sbvh));
}
} else {
auto sbvh = shape_bbox[object->shape];
bbox = merge(bbox, transform_bbox(object->frame, sbvh));
}
}
return bbox;
}
// Add missing cameras.
void add_cameras(scn::model* scene) {
if (!scene->cameras.empty()) return;
auto camera = add_camera(scene, "camera");
camera->orthographic = false;
camera->film = 0.036;
camera->aspect = (float)16 / (float)9;
camera->aperture = 0;
camera->lens = 0.050;
auto bbox = compute_bounds(scene);
auto center = (bbox.max + bbox.min) / 2;
auto bbox_radius = length(bbox.max - bbox.min) / 2;
auto camera_dir = vec3f{0, 0, 1};
auto camera_dist = bbox_radius * camera->lens /
(camera->film / camera->aspect);
camera_dist *= 2.0f; // correction for tracer camera implementation
auto from = camera_dir * camera_dist + center;
auto to = center;
auto up = vec3f{0, 1, 0};
camera->frame = lookat_frame(from, to, up);
camera->focus = length(from - to);
}
// Add missing radius.
void add_radius(scn::model* scene, float radius = 0.001f) {
for (auto shape : scene->shapes) {
if (shape->points.empty() && shape->lines.empty()) continue;
if (!shape->radius.empty()) continue;
shape->radius.assign(shape->positions.size(), radius);
}
}
// Add missing materials.
void add_materials(scn::model* scene) {
auto default_material = (scn::material*)nullptr;
for (auto& object : scene->objects) {
if (object->material) continue;
if (!default_material) {
default_material = add_material(scene);
default_material->color = {0.8, 0.8, 0.8};
}
object->material = default_material;
}
}
// Add a sky environment
void add_sky(scn::model* scene, float sun_angle) {
auto texture = add_texture(scene, "sky");
auto sunsky = img::image<vec4f>{{1024, 512}};
make_sunsky(sunsky, sunsky.size(), sun_angle);
texture->colorf.resize(sunsky.size());
for (auto j = 0; j < sunsky.size().y; j++)
for (auto i = 0; i < sunsky.size().x; i++)
texture->colorf[{i, j}] = xyz(sunsky[{i, j}]);
auto environment = add_environment(scene, "sky");
environment->emission = {1, 1, 1};
environment->emission_tex = texture;
}
// Reduce memory usage
void trim_memory(scn::model* scene) {
for (auto shape : scene->shapes) {
shape->points.shrink_to_fit();
shape->lines.shrink_to_fit();
shape->triangles.shrink_to_fit();
shape->quads.shrink_to_fit();
shape->positions.shrink_to_fit();
shape->normals.shrink_to_fit();
shape->texcoords.shrink_to_fit();
shape->colors.shrink_to_fit();
shape->radius.shrink_to_fit();
shape->tangents.shrink_to_fit();
}
for (auto subdiv : scene->subdivs) {
subdiv->quadspos.shrink_to_fit();
subdiv->quadsnorm.shrink_to_fit();
subdiv->quadstexcoord.shrink_to_fit();
subdiv->positions.shrink_to_fit();
subdiv->normals.shrink_to_fit();
subdiv->texcoords.shrink_to_fit();
}
for (auto texture : scene->textures) {
texture->colorf.shrink_to_fit();
texture->colorb.shrink_to_fit();
texture->scalarf.shrink_to_fit();
texture->scalarb.shrink_to_fit();
}
scene->cameras.shrink_to_fit();
scene->shapes.shrink_to_fit();
scene->textures.shrink_to_fit();
scene->environments.shrink_to_fit();
}
// Check texture size
static vec2i texture_size(const scn::texture* texture) {
if (!texture->colorf.empty()) {
return texture->colorf.size();
} else if (!texture->colorb.empty()) {
return texture->colorb.size();
} else if (!texture->scalarf.empty()) {
return texture->scalarf.size();
} else if (!texture->scalarb.empty()) {
return texture->scalarb.size();
} else {
return zero2i;
}
}
// Evaluate a texture
static vec3f lookup_texture(
const scn::texture* texture, const vec2i& ij, bool ldr_as_linear = false) {
if (!texture->colorf.empty()) {
return texture->colorf[ij];
} else if (!texture->colorb.empty()) {
return ldr_as_linear ? byte_to_float(texture->colorb[ij])
: srgb_to_rgb(byte_to_float(texture->colorb[ij]));
} else if (!texture->scalarf.empty()) {
return vec3f{texture->scalarf[ij]};
} else if (!texture->scalarb.empty()) {
return ldr_as_linear
? byte_to_float(vec3b{texture->scalarb[ij]})
: srgb_to_rgb(byte_to_float(vec3b{texture->scalarb[ij]}));
} else {
return {1, 1, 1};
}
}
// Evaluate a texture
static vec3f eval_texture(const scn::texture* texture, const vec2f& uv,
bool ldr_as_linear = false, bool no_interpolation = false,
bool clamp_to_edge = false) {
// get texture
if (!texture) return {1, 1, 1};
// get img::image width/height
auto size = texture_size(texture);
// get coordinates normalized for tiling
auto s = 0.0f, t = 0.0f;
if (clamp_to_edge) {
s = clamp(uv.x, 0.0f, 1.0f) * size.x;
t = clamp(uv.y, 0.0f, 1.0f) * size.y;
} else {
s = fmod(uv.x, 1.0f) * size.x;
if (s < 0) s += size.x;
t = fmod(uv.y, 1.0f) * size.y;
if (t < 0) t += size.y;
}
// get img::image coordinates and residuals
auto i = clamp((int)s, 0, size.x - 1), j = clamp((int)t, 0, size.y - 1);
auto ii = (i + 1) % size.x, jj = (j + 1) % size.y;
auto u = s - i, v = t - j;
if (no_interpolation) return lookup_texture(texture, {i, j}, ldr_as_linear);
// handle interpolation
return lookup_texture(texture, {i, j}, ldr_as_linear) * (1 - u) * (1 - v) +
lookup_texture(texture, {i, jj}, ldr_as_linear) * (1 - u) * v +
lookup_texture(texture, {ii, j}, ldr_as_linear) * u * (1 - v) +
lookup_texture(texture, {ii, jj}, ldr_as_linear) * u * v;
}
// Compute per-vertex normals for quads.
static std::vector<vec3f> compute_normals(
const std::vector<vec4i>& quads, const std::vector<vec3f>& positions) {
auto normals = std::vector<vec3f>{positions.size()};
for (auto& normal : normals) normal = zero3f;
for (auto& q : quads) {
auto normal = quad_normal(
positions[q.x], positions[q.y], positions[q.z], positions[q.w]);
auto area = quad_area(
positions[q.x], positions[q.y], positions[q.z], positions[q.w]);
normals[q.x] += normal * area;
normals[q.y] += normal * area;
normals[q.z] += normal * area;
if (q.z != q.w) normals[q.w] += normal * area;
}
for (auto& normal : normals) normal = normalize(normal);
return normals;
}
// Convert face varying data to single primitives. Returns the quads indices
// and filled vectors for pos, norm and texcoord.
std::tuple<std::vector<vec4i>, std::vector<vec3f>, std::vector<vec3f>,
std::vector<vec2f>> static split_facevarying(const std::vector<vec4i>&
quadspos,
const std::vector<vec4i>& quadsnorm,
const std::vector<vec4i>& quadstexcoord,
const std::vector<vec3f>& positions, const std::vector<vec3f>& normals,
const std::vector<vec2f>& texcoords) {
auto split = std::tuple<std::vector<vec4i>, std::vector<vec3f>,
std::vector<vec3f>, std::vector<vec2f>>{};
auto& [split_quads, split_positions, split_normals, split_texcoords] = split;
// make faces unique
std::unordered_map<vec3i, int> vert_map;
split_quads.resize(quadspos.size());
for (auto fid = 0; fid < quadspos.size(); fid++) {
for (auto c = 0; c < 4; c++) {
auto v = vec3i{
(&quadspos[fid].x)[c],
(!quadsnorm.empty()) ? (&quadsnorm[fid].x)[c] : -1,
(!quadstexcoord.empty()) ? (&quadstexcoord[fid].x)[c] : -1,
};
auto it = vert_map.find(v);
if (it == vert_map.end()) {
auto s = (int)vert_map.size();
vert_map.insert(it, {v, s});
(&split_quads[fid].x)[c] = s;
} else {
(&split_quads[fid].x)[c] = it->second;
}
}
}
// fill vert data
split_positions.clear();
if (!positions.empty()) {
split_positions.resize(vert_map.size());
for (auto& [vert, index] : vert_map) {
split_positions[index] = positions[vert.x];
}
}
split_normals.clear();
if (!normals.empty()) {
split_normals.resize(vert_map.size());
for (auto& [vert, index] : vert_map) {
split_normals[index] = normals[vert.y];
}
}
split_texcoords.clear();
if (!texcoords.empty()) {
split_texcoords.resize(vert_map.size());
for (auto& [vert, index] : vert_map) {
split_texcoords[index] = texcoords[vert.z];
}
}
return split;
}
// Apply subdivision and displacement rules.
std::unique_ptr<subdiv> subdivide_subdiv(
scn::subdiv* shape, int subdivisions, bool smooth) {
auto tesselated = std::make_unique<subdiv>(*shape);
if (!subdivisions) return tesselated;
std::tie(tesselated->quadstexcoord, tesselated->texcoords) =
yshp::subdivide_catmullclark(
tesselated->quadstexcoord, tesselated->texcoords, subdivisions, true);
std::tie(tesselated->quadsnorm, tesselated->normals) =
yshp::subdivide_catmullclark(
tesselated->quadsnorm, tesselated->normals, subdivisions, true);
std::tie(tesselated->quadspos, tesselated->positions) =
yshp::subdivide_catmullclark(
tesselated->quadspos, tesselated->positions, subdivisions);
if (smooth) {
tesselated->normals = compute_normals(
tesselated->quadspos, tesselated->positions);
tesselated->quadsnorm = tesselated->quadspos;
} else {
tesselated->normals = {};
tesselated->quadsnorm = {};
}
return tesselated;
}
// Apply displacement to a shape
std::unique_ptr<subdiv> displace_subdiv(scn::subdiv* subdiv, float displacement,
scn::texture* displacement_tex, bool smooth) {
auto displaced = std::make_unique<scn::subdiv>(*subdiv);
if (!displacement || !displacement_tex) return displaced;
if (subdiv->texcoords.empty())
throw std::runtime_error("missing texture coordinates");
// facevarying case
auto offset = std::vector<float>(subdiv->positions.size(), 0);
auto count = std::vector<int>(subdiv->positions.size(), 0);
for (auto fid = 0; fid < subdiv->quadspos.size(); fid++) {
auto qpos = subdiv->quadspos[fid];
auto qtxt = subdiv->quadstexcoord[fid];
for (auto i = 0; i < 4; i++) {
auto disp = mean(
eval_texture(displacement_tex, subdiv->texcoords[qtxt[i]], true));
if (!displacement_tex->scalarb.empty() ||
!displacement_tex->colorb.empty())
disp -= 0.5f;
offset[qpos[i]] += displacement * disp;
count[qpos[i]] += 1;
}
}
auto normals = compute_normals(subdiv->quadspos, subdiv->positions);
for (auto vid = 0; vid < subdiv->positions.size(); vid++) {
displaced->positions[vid] += normals[vid] * offset[vid] / count[vid];
}
if (smooth || !subdiv->normals.empty()) {
displaced->quadsnorm = subdiv->quadspos;
displaced->normals = compute_normals(
displaced->quadspos, displaced->positions);
}
return displaced;
}
void tesselate_subdiv(scn::model* scene, scn::subdiv* subdiv) {
auto material = (scn::material*)nullptr;
auto shape = (scn::shape*)nullptr;
for (auto object : scene->objects) {
if (object->subdiv == subdiv) {
material = object->material;
shape = object->shape;
break;
}
}
auto tesselated = subdivide_subdiv(
subdiv, material->subdivisions, material->smooth);
auto displaced = displace_subdiv(tesselated.get(), material->displacement,
material->displacement_tex, material->smooth);
std::tie(shape->quads, shape->positions, shape->normals, shape->texcoords) =
split_facevarying(displaced->quadspos, displaced->quadsnorm,
displaced->quadstexcoord, displaced->positions, displaced->normals,
displaced->texcoords);
shape->points = {};
shape->lines = {};
shape->triangles = {};
shape->colors = {};
shape->radius = {};
}
void tesselate_subdivs(scn::model* scene, progress_callback progress_cb) {
if (scene->subdivs.empty()) return;
// handle progress
auto progress = vec2i{0, (int)scene->subdivs.size()};
// tesselate subdivs
for (auto subdiv : scene->subdivs) {
if (progress_cb) progress_cb("tesseleate subdiv", progress.x++, progress.y);
tesselate_subdiv(scene, subdiv);
}
// done
if (progress_cb) progress_cb("tesseleate subdiv", progress.x++, progress.y);
}
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// GENERIC SCENE LOADING
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
// Load/save a scene in the builtin JSON format.
static bool load_json_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
static bool save_json_scene(const std::string& filename,
const scn::model* scene, std::string& error, progress_callback progress_cb,
bool noparallel);
// Load/save a scene from/to OBJ.
static bool load_obj_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
static bool save_obj_scene(const std::string& filename, const scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
// Load/save a scene from/to PLY. Loads/saves only one mesh with no other data.
static bool load_ply_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
static bool save_ply_scene(const std::string& filename, const scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
// Load/save a scene from/to glTF.
static bool load_gltf_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
// Load/save a scene from/to pbrt-> This is not robust at all and only
// works on scene that have been previously adapted since the two renderers
// are too different to match.
static bool load_pbrt_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel);
static bool save_pbrt_scene(const std::string& filename,
const scn::model* scene, std::string& error, progress_callback progress_cb,
bool noparallel);
// Load a scene
bool load_scene(const std::string& filename, scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel) {
auto ext = sfs::path(filename).extension();
if (ext == ".json" || ext == ".JSON") {
return load_json_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".obj" || ext == ".OBJ") {
return load_obj_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".gltf" || ext == ".GLTF") {
return load_gltf_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".pbrt" || ext == ".PBRT") {
return load_pbrt_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".ply" || ext == ".PLY") {
return load_ply_scene(filename, scene, error, progress_cb, noparallel);
} else {
throw std::runtime_error{filename + ": unknown format"};
}
}
// Save a scene
bool save_scene(const std::string& filename, const scn::model* scene,
std::string& error, progress_callback progress_cb, bool noparallel) {
auto ext = sfs::path(filename).extension();
if (ext == ".json" || ext == ".JSON") {
return save_json_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".obj" || ext == ".OBJ") {
return save_obj_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".pbrt" || ext == ".PBRT") {
return save_pbrt_scene(filename, scene, error, progress_cb, noparallel);
} else if (ext == ".ply" || ext == ".PLY") {
return save_ply_scene(filename, scene, error, progress_cb, noparallel);
} else {
throw std::runtime_error{filename + ": unknown format"};
}
}
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// INDIVIDUAL ELEMENTS
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
// Get extension (not including '.').
static std::string get_extension(const std::string& filename) {
auto pos = filename.rfind('.');
if (pos == std::string::npos) return "";
return filename.substr(pos);
}
// Loads/saves a channel float/byte img::image in linear/srgb color space.
static bool load_image(const std::string& filename, img::image<vec4f>& colorf,
img::image<vec4b>& colorb, std::string& error) {
if (img::is_hdr_filename(filename)) {
return load_image(filename, colorf, error);
} else {
return load_image(filename, colorb, error);
}
}
// Loads/saves a 3 channel float/byte img::image in linear/srgb color space.
static bool load_image(const std::string& filename, img::image<vec3f>& colorf,
img::image<vec3b>& colorb, std::string& error) {
if (img::is_hdr_filename(filename)) {
return load_image(filename, colorf, error);
} else {
return load_image(filename, colorb, error);
}
}
static bool save_image(const std::string& filename,
const img::image<vec3f>& colorf, const img::image<vec3b>& colorb,
std::string& error) {
if (img::is_hdr_filename(filename)) {
return save_image(filename, colorf, error);
} else {
return save_image(filename, colorb, error);
}
}
// Loads/saves a 1 channel float/byte img::image in linear/srgb color space.
static bool load_image(const std::string& filename, img::image<float>& scalarf,
img::image<byte>& scalarb, std::string& error) {
if (img::is_hdr_filename(filename)) {
return load_image(filename, scalarf, error);
} else {
return load_image(filename, scalarb, error);
}
}
static bool save_image(const std::string& filename,
const img::image<float>& scalarf, const img::image<byte>& scalarb,
std::string& error) {
if (img::is_hdr_filename(filename)) {
return save_image(filename, scalarf, error);
} else {
return save_image(filename, scalarb, error);
}
}
// load instances
static bool load_instance(const std::string& filename,
std::vector<frame3f>& frames, std::string& error) {
auto format_error = [filename, &error]() {
error = filename + ": unknown format";
return false;
};
auto ext = get_extension(filename);
if (ext == ".ply" || ext == ".PLY") {
auto ply = ply::model{};
if (!load_ply(filename, &ply, error)) return false;
get_values(&ply, "instance",
{"xx", "xy", "xz", "yx", "yy", "yz", "zx", "zy", "zz", "ox", "oy",
"oz"},
frames);
return true;
} else {
return format_error();
}
}
// save instances
static bool save_instance(const std::string& filename,
const std::vector<frame3f>& frames, std::string& error,
bool ascii = false) {
auto format_error = [filename, &error]() {
error = filename + ": unknown format";
return false;
};
auto ext = get_extension(filename);
if (ext == ".ply" || ext == ".PLY") {
auto ply = ply::model{};
add_values(&ply, "instance",
{"xx", "xy", "xz", "yx", "yy", "yz", "zx", "zy", "zz", "ox", "oy",
"oz"},
frames);
if (!save_ply(filename, &ply, error)) return false;
return true;
} else {
return format_error();
}
}
} // namespace yocto::sceneio
// -----------------------------------------------------------------------------
// JSON SUPPORT
// -----------------------------------------------------------------------------
namespace yocto::math {
using json = nlohmann::json;
using std::array;
// support for json conversions
inline void to_json(json& j, const vec3f& value) {
nlohmann::to_json(j, (const array<float, 3>&)value);
}
inline void to_json(json& j, const frame3f& value) {
nlohmann::to_json(j, (const array<float, 12>&)value);
}
inline void from_json(const json& j, vec3f& value) {
nlohmann::from_json(j, (array<float, 3>&)value);
}
inline void from_json(const json& j, mat3f& value) {
nlohmann::from_json(j, (array<float, 9>&)value);
}
inline void from_json(const json& j, frame3f& value) {
nlohmann::from_json(j, (array<float, 12>&)value);
}
} // namespace yocto::math
// -----------------------------------------------------------------------------
// JSON IO
// -----------------------------------------------------------------------------
namespace yocto::sceneio {
using json = nlohmann::json;
// Load a text file
inline bool load_text(
const std::string& filename, std::string& str, std::string& error) {
// error helpers
auto open_error = [filename, &error]() {
error = filename + ": file not found";
return false;
};
auto read_error = [filename, &error]() {
error = filename + ": read error";
return false;
};
// https://stackoverflow.com/questions/174531/how-to-read-the-content-of-a-file-to-a-string-in-c
auto fs = fopen(filename.c_str(), "rb");
if (!fs) return open_error();
auto fs_guard = std::unique_ptr<FILE, decltype(&fclose)>{fs, fclose};
fseek(fs, 0, SEEK_END);
auto length = ftell(fs);
fseek(fs, 0, SEEK_SET);
str.resize(length);
if (fread(str.data(), 1, length, fs) != length) return read_error();
return true;
}
// Save a text file
inline bool save_text(
const std::string& filename, const std::string& str, std::string& error) {
// error helpers
auto open_error = [filename, &error]() {
error = filename + ": file not found";
return false;
};
auto write_error = [filename, &error]() {
error = filename + ": write error";
return false;
};
auto fs = fopen(filename.c_str(), "wt");
if (!fs) return open_error();
auto fs_guard = std::unique_ptr<FILE, decltype(&fclose)>{fs, fclose};
if (fprintf(fs, "%s", str.c_str()) < 0) return write_error();
return true;
}
// Load a binary file
inline std::string load_text(const std::string& filename, std::string& error) {
auto text = std::string{};
if (!load_text(filename, text, error)) return {};
return text;
}
// Load a binary file
inline bool load_binary(
const std::string& filename, std::vector<byte>& data, std::string& error) {
// error helpers
auto open_error = [filename, &error]() {
error = filename + ": file not found";
return false;
};
auto read_error = [filename, &error]() {
error = filename + ": read error";
return false;
};
// https://stackoverflow.com/questions/174531/how-to-read-the-content-of-a-file-to-a-std::string-in-c
auto fs = fopen(filename.c_str(), "rb");
if (!fs) return open_error();
auto fs_guard = std::unique_ptr<FILE, decltype(&fclose)>{fs, fclose};
fseek(fs, 0, SEEK_END);
auto length = ftell(fs);
fseek(fs, 0, SEEK_SET);
data.resize(length);