-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathlibpr1.c
1527 lines (1339 loc) · 41.4 KB
/
libpr1.c
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
/*
* libpr1.c - a library of primitive object output routines, part 1 of 3.
* Lights, cameras, textures.
*
* Author: Eric Haines
*
* Modified: 1 December 2012 - Added support for re-using identical colours
* if using delayed output. Changes to lib_output_color,
* case OUTPUT_DELAYED. Added local lookup_surface_index function
* Sam [sbt] Thompson
*
*/
/*-----------------------------------------------------------------*/
/* include section */
/*-----------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "lib.h"
#include "drv.h"
/*-----------------------------------------------------------------*/
/* defines/constants section */
/*-----------------------------------------------------------------*/
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void lib_output_comment (char *comment)
#else
void lib_output_comment (comment)
char *comment;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_RAWTRI:
case OUTPUT_DXF: /* well, there's the 999 format, but... >>>>> */
case OUTPUT_RWX:
/* no comments allowed for these file formats */
break;
case OUTPUT_NFF:
case OUTPUT_OBJ:
case OUTPUT_RIB:
case OUTPUT_3DMF:
case OUTPUT_VRML1:
case OUTPUT_VRML2:
fprintf(gOutfile, "# %s\n", comment);
break;
case OUTPUT_RAYSHADE:
case OUTPUT_POLYRAY:
case OUTPUT_POVRAY_10:
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
fprintf(gOutfile, "// %s\n", comment);
break;
/* unknown comment formats... whoever knows, please fix or fill in! */
case OUTPUT_PLG:
case OUTPUT_VIVID:
case OUTPUT_RTRACE:
case OUTPUT_QRT:
case OUTPUT_ART:
default:
fprintf(gOutfile, "// <comment> '%s'\n", comment);
break;
}
} /* lib_output_comment */
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void lib_output_vector (double x, double y, double z)
#else
void lib_output_vector(x, y, z)
double x, y, z;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_DXF:
case OUTPUT_RWX:
break;
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_NFF:
case OUTPUT_VIVID:
case OUTPUT_RAYSHADE:
case OUTPUT_RTRACE:
case OUTPUT_RAWTRI:
case OUTPUT_3DMF:
case OUTPUT_VRML1:
case OUTPUT_VRML2:
fprintf(gOutfile, "%g %g %g", x, y, z);
break;
case OUTPUT_POVRAY_10:
fprintf(gOutfile, "<%g %g %g>", x, y, z);
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
fprintf(gOutfile, "<%g, %g, %g>", x, y, z);
break;
case OUTPUT_POLYRAY:
case OUTPUT_QRT:
case OUTPUT_ART:
fprintf(gOutfile, "%g, %g, %g", x, y, z);
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
} /* lib_output_vector */
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
void axis_to_z (COORD3 axis, double *xang, double *yang)
#else
void axis_to_z(axis, xang, yang)
COORD3 axis;
double *xang, *yang;
#endif
{
double len;
/* The axis is in RH coordinates and turns the axis to Z axis */
/* The angles are for the LH coordinate system */
len = sqrt(axis[X] * axis[X] + axis[Z] * axis[Z]);
*xang = -180.0 * asin(axis[Y]) / PI;
if (len < EPSILON)
*yang = 0.0;
else
*yang = 180.0 * acos(axis[Z] / len) / PI;
if (axis[X] < 0)
*yang = -(*yang);
} /* axis_to_z */
/*-----------------------------------------------------------------*/
/*
* Output viewpoint location. The parameters are:
* From: The eye location.
* At: A position to be at the center of the image. A.k.a. "lookat"
* Up: A vector defining which direction is up.
* Fov: Vertical field of view of the camera
* Aspect: Aspect ratio of horizontal fov to vertical fov
* Hither: Minimum distance to any ray-surface intersection
* Resx: X resolution of resulting image
* Resy: Y resolution of resulting image
*
* For all databases some viewing parameters are always the same:
*
* Viewing angle is defined as from the center of top pixel row to bottom
* pixel row and left column to right column.
* Yon is "at infinity."
*/
#ifdef ANSI_FN_DEF
void lib_output_viewpoint (COORD3 from, COORD3 at, COORD3 up,
double fov_angle, double aspect_ratio,
double hither, int resx, int resy)
#else
void lib_output_viewpoint(from, at, up,
fov_angle, aspect_ratio, hither,
resx, resy)
COORD3 from, at, up;
double fov_angle, aspect_ratio, hither;
int resx, resy;
#endif
{
COORD3 axis, myright, tmp;
COORD4 viewvec, rightvec;
MATRIX m1;
double tmpf;
double frustrumheight, frustrumwidth;
switch (gRT_out_format) {
case OUTPUT_DELAYED:
case OUTPUT_VIDEO:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
/* Save the various view parameters */
COPY_COORD3(gViewpoint.from, from);
COPY_COORD3(gViewpoint.at, at);
COPY_COORD3(gViewpoint.up, up);
gViewpoint.angle = fov_angle;
gViewpoint.hither = hither;
gViewpoint.resx = resx;
gViewpoint.resy = resy;
gViewpoint.aspect = aspect_ratio;
/* Make the 3D clipping box for this view */
gView_bounds[0][0] = 0;
gView_bounds[1][0] = gViewpoint.resx;
gView_bounds[0][1] = 0;
gView_bounds[1][1] = gViewpoint.resy;
gView_bounds[0][2] = gViewpoint.hither;
gView_bounds[1][2] = 1.0e10;
/* Generate the perspective view matrix */
lib_create_view_matrix(gViewpoint.tx, gViewpoint.from, gViewpoint.at,
gViewpoint.up, gViewpoint.resx, gViewpoint.resy,
gViewpoint.angle, gViewpoint.aspect);
/* Turn on graphics using system dependent video routines */
if (gRT_out_format == OUTPUT_VIDEO) {
display_init(gViewpoint.resx, gViewpoint.resy, gBkgnd_color);
gView_init_flag = 1;
}
break;
case OUTPUT_NFF:
fprintf(gOutfile, "v\n");
fprintf(gOutfile, "from %g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "at %g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "angle %g\n", fov_angle);
fprintf(gOutfile, "hither %g\n", hither);
fprintf(gOutfile, "resolution %d %d\n", resx, resy);
break;
case OUTPUT_POVRAY_10:
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
/* Let's get a set of vectors that are all at right angles to each
other that describe the view given. */
lib_normalize_vector(up);
SUB3_COORD3(viewvec, at, from);
lib_normalize_vector(viewvec);
CROSS(rightvec, up, viewvec);
lib_normalize_vector(rightvec);
CROSS(up, viewvec, rightvec);
lib_normalize_vector(up);
/* Calculate the height of the view frustrum in world coordinates.
and then scale the right and up vectors appropriately. */
frustrumheight = 2.0 * tan(PI * fov_angle / 360.0);
frustrumwidth = aspect_ratio * frustrumheight;
up[X] *= frustrumheight;
up[Y] *= frustrumheight;
up[Z] *= frustrumheight;
rightvec[X] *= frustrumwidth;
rightvec[Y] *= frustrumwidth;
rightvec[Z] *= frustrumwidth;
tab_indent();
fprintf(gOutfile, "camera {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "location ");
lib_output_vector(from[X], from[Y], from[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "direction ");
lib_output_vector(viewvec[X], viewvec[Y], viewvec[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "right ");
lib_output_vector(-rightvec[X], -rightvec[Y], -rightvec[Z]);
fprintf(gOutfile, "\n");
tab_indent();
fprintf(gOutfile, "up ");
lib_output_vector(up[X], up[Y], up[Z]);
fprintf(gOutfile, "\n");
tab_dec();
fprintf(gOutfile, "} // camera\n\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "viewpoint {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "from <%g, %g, %g>\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "at <%g, %g, %g>\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up <%g, %g, %g>\n", up[X], up[Y], up[Z]);
tab_indent();
fprintf(gOutfile, "angle %g\n", fov_angle);
tab_indent();
/* Note the negative, this is to change to right handed
coordinates (like most of the other tracers) */
fprintf(gOutfile, "aspect %g\n", -aspect_ratio);
tab_indent();
fprintf(gOutfile, "hither %g\n", hither);
tab_indent();
fprintf(gOutfile, "resolution %d, %d\n", resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
tab_indent();
fprintf(gOutfile, "studio {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "from %g %g %g\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "at %g %g %g\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
tab_indent();
fprintf(gOutfile, "angle %g\n", fov_angle);
tab_indent();
fprintf(gOutfile, "aspect %g\n", aspect_ratio);
tab_indent();
fprintf(gOutfile, "resolution %d %d\n", resx, resy);
tab_indent();
fprintf(gOutfile, "no_exp_trans\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "OBSERVER = (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "loc = (%g,%g,%g),\n", from[X], from[Y], from[Z]);
tab_indent();
fprintf(gOutfile, "lookat = (%g,%g,%g),\n", at[X], at[Y], at[Z]);
tab_indent();
fprintf(gOutfile, "up = (%g,%g,%g)\n", up[X], up[Y], up[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
tab_indent();
fprintf(gOutfile, "FOC_LENGTH = %g\n",
35.0 / tan(PI * fov_angle / 360.0));
tab_indent();
fprintf(gOutfile, "DEFAULT (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "aspect = %g,\n", 6.0 * aspect_ratio / 7.0);
tab_indent();
fprintf(gOutfile, "x_res = %d, y_res = %d\n", resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
/* QRT insists on having the output file as part of the data text */
tab_indent();
fprintf(gOutfile, "FILE_NAME = qrt.tga\n");
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "eyep %g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "lookp %g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "up %g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "fov %g %g\n", aspect_ratio * fov_angle,
fov_angle);
fprintf(gOutfile, "screen %d %d\n", resx, resy);
fprintf(gOutfile, "sample 1 nojitter\n");
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "View\n");
fprintf(gOutfile, "%g %g %g\n", from[X], from[Y], from[Z]);
fprintf(gOutfile, "%g %g %g\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "%g %g %g\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "%g %g\n", aspect_ratio * fov_angle/2,
fov_angle/2);
break;
case OUTPUT_ART:
fprintf(gOutfile, "maxhitlevel 4\n");
fprintf(gOutfile, "screensize 0.0, 0.0\n");
fprintf(gOutfile, "fieldofview %g\n", fov_angle);
fprintf(gOutfile, "up(%g, %g, %g)\n", up[X], up[Y], up[Z]);
fprintf(gOutfile, "lookat(%g, %g, %g, ", from[X], from[Y], from[Z]);
fprintf(gOutfile, "%g, %g, %g, 0.0)\n", at[X], at[Y], at[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_RAWTRI:
break;
case OUTPUT_RIB:
//fprintf(gOutfile, "version 3.03\n");
fprintf(gOutfile, "FrameBegin 1\n");
fprintf(gOutfile, "Format %d %d 1\n", resx, resy);
fprintf(gOutfile, "PixelSamples 1 1\n");
fprintf(gOutfile, "ShadingRate 1.0\n");
//fprintf(gOutfile, "Declare \"reflected\" \"float\"\n");
//fprintf(gOutfile, "Declare \"transmitted\" \"float\"\n");
//fprintf(gOutfile, "Declare \"index\" \"float\"\n");
//fprintf(gOutfile, "Option \"render\" \"max_raylevel\" [4]\n");
fprintf(gOutfile, "Attribute \"visibility\" \"int trace\" [1]\n");
fprintf(gOutfile, "Attribute \"visibility\" \"string transmission\" [\"opaque\"]\n");
fprintf(gOutfile, "Attribute \"trace\" \"int maxspeculardepth\" [4]\n");
fprintf(gOutfile, "Projection \"perspective\" \"fov\" %#g\n",
fov_angle);
fprintf(gOutfile, "Clipping %#g %#g\n\n", hither, 1e38);
/* Calculate transformation from intrisic position */
SUB3_COORD3(axis, at, from);
lib_normalize_vector(axis);
COPY_COORD3(tmp,axis);
tmpf = DOT_PRODUCT(up,axis);
tmp[0] *= tmpf; tmp[1] *= tmpf; tmp[2] *= tmpf;
SUB2_COORD3(up,tmp);
lib_normalize_vector(up);
CROSS(myright,up,axis);
lib_normalize_vector (myright);
m1[0][0] = myright[0]; m1[1][0] = myright[1];
m1[2][0] = myright[2]; m1[3][0] = 0;
m1[0][1] = up[0]; m1[1][1] = up[1];
m1[2][1] = up[2]; m1[3][1] = 0;
m1[0][2] = axis[0]; m1[1][2] = axis[1];
m1[2][2] = axis[2]; m1[3][2] = 0;
m1[0][3] = 0; m1[1][3] = 0; m1[2][3] = 0; m1[3][3] = 1;
fprintf (gOutfile, "ConcatTransform [%g %g %g %g %g %g %g %g %g %g %g %g %g %g %g %g]\n",
m1[0][0], m1[0][1], m1[0][2], m1[0][3],
m1[1][0], m1[1][1], m1[1][2], m1[1][3],
m1[2][0], m1[2][1], m1[2][2], m1[2][3],
m1[3][0], m1[3][1], m1[3][2], m1[3][3]);
fprintf (gOutfile, "Translate %g %g %g\n", -from[0], -from[1], -from[2]);
fprintf(gOutfile, "WorldBegin\n");
tab_inc();
break ;
case OUTPUT_DXF:
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "SECTION\n" ) ;
fprintf(gOutfile, " 2\n" ) ;
fprintf(gOutfile, "HEADER\n" ) ;
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "ENDSEC\n" ) ;
fprintf(gOutfile, " 0\n" ) ;
fprintf(gOutfile, "SECTION\n" ) ;
fprintf(gOutfile, " 2\n" ) ;
fprintf(gOutfile, "ENTITIES\n" ) ;
/* should add view someday ... */
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewAngleAspectCamera ( %g %g )\n",
fov_angle, aspect_ratio);
tab_indent();
fprintf(gOutfile, "CameraPlacement ( %g %g %g %g %g %g %g %g %g )\n",
from[X], from[Y], from[Z],
at[X], at[Y], at[Z],
up[X], up[Y], up[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewHints ( )\n");
tab_indent();
fprintf(gOutfile, "ImageDimensions ( %d %d )\n",
resx, resy);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
tab_indent();
fprintf(gOutfile, "PerspectiveCamera {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "heightAngle %g\n", DEG2RAD(fov_angle));
tab_indent();
fprintf(gOutfile, "position %g %g %g\n",
from[X], from[Y], from[Z]);
tab_indent();
lib_calc_view_vector(from, at, up, viewvec);
fprintf(gOutfile, "orientation %g %g %g %g\n",
viewvec[0], viewvec[1], viewvec[2], viewvec[3]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "Viewpoint {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "fieldOfView %g\n", DEG2RAD(fov_angle));
tab_indent();
fprintf(gOutfile, "position %g %g %g\n",
from[X], from[Y], from[Z]);
tab_indent();
lib_calc_view_vector(from, at, up, viewvec);
fprintf(gOutfile, "orientation %g %g %g %g\n",
viewvec[0], viewvec[1], viewvec[2], viewvec[3]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
/*
* Output light. A light is defined by position. All lights have the same
* intensity.
*
*/
#ifdef ANSI_FN_DEF
void lib_output_light (COORD4 center_pt)
#else
void lib_output_light(center_pt)
COORD4 center_pt;
#endif
{
COORD3 vec;
MATRIX txmat;
double lscale;
light_ptr new_light;
if (center_pt[W] != 0.0)
lscale = center_pt[W];
else
lscale = 1.0;
COPY_COORD3(vec, center_pt);
if (lib_tx_active()) {
/* Transform the location of the light (it's a point so that's
all we need to do) */
lib_get_current_tx(txmat);
lib_transform_vector(vec, vec, txmat);
}
switch (gRT_out_format) {
case OUTPUT_DELAYED:
new_light = (light_ptr)malloc(sizeof(struct light_struct));
if (new_light == NULL)
/* Quietly fail & return */
return;
COPY_COORD4(new_light->center_pt, center_pt);
new_light->center_pt[W] = lscale;
new_light->next = gLib_lights;
gLib_lights = new_light;
break;
case OUTPUT_VIDEO:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
/* Not currently doing anything with lights */
break;
case OUTPUT_NFF:
fprintf(gOutfile, "l %g %g %g\n",
vec[X], vec[Y], vec[Z]);
break;
case OUTPUT_POVRAY_10:
tab_indent();
fprintf(gOutfile, "object {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "light_source {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "<%g %g %g>",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color red %g green %g blue %g\n",
lscale, lscale, lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // light\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "} // object\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
tab_indent();
fprintf(gOutfile, "light_source {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "<%g, %g, %g>",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color red %g green %g blue %g\n",
lscale, lscale, lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // light\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "light <%g, %g, %g>, <%g, %g, %g>\n",
lscale, lscale, lscale,
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
tab_indent();
fprintf(gOutfile, "light {type point position %g %g %g",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " color %g %g %g }\n",
lscale, lscale, lscale);
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "LAMP ( loc = (%g,%g,%g), dist = 0, radius = 1,",
vec[X], vec[Y], vec[Z]);
fprintf(gOutfile, " amb = (%g,%g,%g) )\n",
lscale, lscale, lscale);
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "light %g point %g %g %g\n",
lscale, vec[X], vec[Y], vec[Z]);
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "1 %g %g %g %g %g %g\n",
vec[X], vec[Y], vec[Z], lscale, lscale, lscale);
break;
case OUTPUT_ART:
tab_indent();
fprintf(gOutfile, "light \n{");
tab_inc();
tab_indent();
fprintf(gOutfile, "location(%g, %g, %g) colour 0.5, 0.5, 0.5\n",
vec[X], vec[Y], vec[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_RAWTRI:
case OUTPUT_DXF:
break;
case OUTPUT_RIB:
{
static int number= 0;
//fprintf(gOutfile, "Attribute \"light\" \"shadows\" \"on\"\n");
fprintf(gOutfile, "LightSource \"shadowspot\" %d \"from\" [ %#g %#g %#g ] \"intensity\" [20] \"shadowname\" [\"raytrace\"]\n",
number++,
vec[X], vec[Y], vec[Z]);
//fprintf(gOutfile, "LightSource \"pointlight\" %d \"from\" [ %#g %#g %#g ] \"intensity\" [20]\n",
// number++,
// vec[X], vec[Y], vec[Z]);
}
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "PointLight ( %g %g %g 1 0 0 True )\n",
vec[X], vec[Y], vec[Z]);
tab_indent();
fprintf(gOutfile, "LightData ( True %g 1 1 1 )\n", lscale);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "PointLight {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "color 1 1 1\n");
tab_indent();
fprintf(gOutfile, "intensity %g\n", lscale);
tab_indent();
fprintf(gOutfile, "location %g %g %g\n",
vec[X], vec[Y], vec[Z]);
tab_indent();
fprintf(gOutfile, "on TRUE\n");
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
/*
* Output background color. A color is simply RGB (monitor dependent, but
* that's life).
*/
#ifdef ANSI_FN_DEF
void lib_output_background_color (COORD3 color)
#else
void lib_output_background_color(color)
COORD3 color;
#endif
{
switch (gRT_out_format) {
case OUTPUT_VIDEO:
case OUTPUT_DELAYED:
case OUTPUT_PLG:
case OUTPUT_OBJ:
case OUTPUT_RWX:
COPY_COORD3(gBkgnd_color, color);
break;
case OUTPUT_NFF:
fprintf(gOutfile, "b %g %g %g\n", color[X], color[Y], color[Z]);
break;
case OUTPUT_POVRAY_10:
tab_indent();
fprintf(gOutfile, "// POV-Ray 1.0 scene file\n");
/* POV-Ray 1.0 does not support a background color */
/* Instead, create arbitrarily large enclosing sphere of that
* color */
tab_indent();
fprintf(gOutfile, "// background color:\n");
tab_indent();
fprintf(gOutfile, "object {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "sphere { <0 0 0> 9000 ");
fprintf(gOutfile,
"texture { ambient 1 diffuse 0 color red %g green %g blue %g } }\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "} // object - background\n");
fprintf(gOutfile, "\n");
break;
case OUTPUT_POVRAY_20:
case OUTPUT_POVRAY_30:
if (gRT_out_format==OUTPUT_POVRAY_20)
{
tab_indent();
fprintf(gOutfile, "// POV-Ray 2 scene file\n");
}
else
{
tab_indent();
fprintf(gOutfile, "// POV-Ray 3 scene file\n");
}
tab_indent();
fprintf(gOutfile, "background { color red %g green %g blue %g }\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_POLYRAY:
tab_indent();
fprintf(gOutfile, "background <%g, %g, %g>\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_VIVID:
/* Vivid insists on putting the background into the studio */
tab_indent();
fprintf(gOutfile, "studio { background %g %g %g }\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_QRT:
tab_indent();
fprintf(gOutfile, "SKY ( horiz = (%g,%g,%g), zenith = (%g,%g,%g),",
color[X], color[Y], color[Z],
color[X], color[Y], color[Z]);
fprintf(gOutfile, " dither = 0 )\n");
break;
case OUTPUT_RAYSHADE:
fprintf(gOutfile, "background %g %g %g\n",
color[X], color[Y], color[Z]);
break;
case OUTPUT_RTRACE:
fprintf(gOutfile, "Colors\n");
fprintf(gOutfile, "%g %g %g\n", color[X], color[Y], color[Z]);
fprintf(gOutfile, "0 0 0\n");
break;
case OUTPUT_RAWTRI:
case OUTPUT_DXF:
break;
case OUTPUT_ART:
tab_indent();
fprintf(gOutfile, "background %g, %g, %g\n",
color[X], color[Y], color[Z]);
fprintf(gOutfile, "\n");
break;
case OUTPUT_RIB:
fprintf(gOutfile, "# Background color [%#g %#g %#g]\n",
color[X], color[Y], color[Z]);
break;
case OUTPUT_3DMF:
tab_indent();
fprintf(gOutfile, "Container (\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "ViewHints ( )\n");
tab_indent();
fprintf(gOutfile, "ImageClearColor ( %g %g %g )\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, ")\n");
break;
case OUTPUT_VRML1:
/* no standard way in 1.0 spec of describing the background color */
break;
case OUTPUT_VRML2:
tab_indent();
fprintf(gOutfile, "Background {\n");
tab_inc();
tab_indent();
fprintf(gOutfile, "skyColor [ %g %g %g ]\n",
color[X], color[Y], color[Z]);
tab_dec();
tab_indent();
fprintf(gOutfile, "}\n");
break;
default:
fprintf(stderr, "Internal Error: bad file type in libpr1.c\n");
exit(1);
break;
}
}
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
static char * create_surface_name(char *name, int val)
#else
static char * create_surface_name(name, val)
char *name;
int val;
#endif
{
char *txname;
if (name != NULL)
return name;
txname = (char *)malloc(7*sizeof(char));
if (txname == NULL)
return NULL;
sprintf(txname, "txt%03d", val);
txname[6] = '\0';
return txname;
}
/*-----------------------------------------------------------------*/
#ifdef ANSI_FN_DEF
static int lookup_surface_index(COORD3 color, double ka,
double kd, double ks, double ks_spec,
double ang, double kt, double i_of_r)
#else
static int lookup_surface_index(color, ka, kd, ks, ks_spec, ang, kt, i_of_r)
COORD3 color;
double ka, kd, ks, ks_spec, ang, kt, i_of_r;
#endif
{
surface_ptr temp_ptr = gLib_surfaces;
while (temp_ptr != NULL)
if ((ABSOLUTE(temp_ptr->color[R_COLOR] - color[R_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->color[G_COLOR] - color[G_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->color[B_COLOR] - color[B_COLOR]) < EPSILON) &&
(ABSOLUTE(temp_ptr->ka - ka) < EPSILON) &&
(ABSOLUTE(temp_ptr->kd - kd) < EPSILON) &&
(ABSOLUTE(temp_ptr->ks - ks) < EPSILON) &&
(ABSOLUTE(temp_ptr->ks_spec - ks_spec) < EPSILON) &&
(ABSOLUTE(temp_ptr->ang - ang) < EPSILON) &&
(ABSOLUTE(temp_ptr->kt - kt) < EPSILON) &&
(ABSOLUTE(temp_ptr->ior - i_of_r) < EPSILON))
return (temp_ptr->surf_index);
else
temp_ptr = temp_ptr->next;
return (0);
}
/*-----------------------------------------------------------------*/
/*
* Output color and shading parameters for all following objects
*
* For POV-Ray and Polyray, a character string will be returned that
* identified this texture. The default texture will be updated with
* the name generated by this function.
*
* Meaning of the color and shading parameters:
* name = name that this surface can be referenced by...
* color = surface color
* ka = ambient component
* kd = diffuse component
* ks = amount contributed from the reflected direction
* ks_spec = contribution from specular highlights (vs. reflection)
* ang = half angle, in degrees, at which specular highlight
* drops to 50% strength
* t = amount contributed from the refracted direction
* i_of_r = index of refraction of the surface
*
*/
#ifdef ANSI_FN_DEF
char * lib_output_color (char *name, COORD3 color, double ka,
double kd, double ks, double ks_spec,
double ang, double kt, double i_of_r)
#else
char * lib_output_color(name, color, ka, kd, ks, ks_spec, ang, kt, i_of_r)
char *name;
COORD3 color;
double ka, kd, ks, ks_spec, ang, kt, i_of_r;
#endif
{
surface_ptr new_surf;
char *txname = NULL;
int txindex = 0;
double phong_pow, ang_radians;
/* Increment the number of surface types we know about */
gTexture_count = ++gTexture_max_count; /* [sbt] N.B. reversed below if we
find in cache. */
gTexture_ior = i_of_r;
/* Calculate the Phong coefficient */
ang_radians = PI * ang / 180.0;