-
Notifications
You must be signed in to change notification settings - Fork 0
/
uf_vec.h.txt
1347 lines (1147 loc) · 39.8 KB
/
uf_vec.h.txt
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
/*******************************************************************************
Copyright (c) 1998-2000 Unigraphics Solutions, Inc.
Unpublished - All Rights Reserved
File Description:
These are vector functions that enable you to copy, add, perform scalar
multiplication, perform affine combinations, scale vectors and other
operations on 2D, 3D, and 4D vectors. The vector function names detail the
dimension of the vectors and provide a brief description of the operation
performed. For example, UF_VEC2_add performs a two dimensional vector addition.
*******************************************************************************/
#ifndef UF_VEC_H_INCLUDED
#define UF_VEC_H_INCLUDED
/***************************************************************************
***************************************************************************/
#include <libufun_exports.h>
#ifdef __cplusplus
extern "C" {
#endif
/******************************************************************************
Performs a two dimensional vector addition and returns the vector
sum in vec_sum[2].
Return:
void
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_add(
const double vec1[2] ,/* <I>
Vector #1
*/
const double vec2[2] ,/* <I>
Vector #2
*/
double vec_sum[2] /* <O>
The vector sum of vectors one and two
vec_sum = vec1 + vec2
*/
);/* <NEC> */
/******************************************************************************
Performs a vector affine combination which consists of adding an
unscaled vector to a scaled vector. The first vector you input is vec[2],
which is unscaled. The second vector you input is the vec_to_scale[2],
which is scaled by the input argument scale. The resultant vector is
output to vec_comb[2].
Return:
Void.
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC2_affine_comb(
const double vec[2] ,/* <I>
Unscaled vector
*/
double scale ,/* <I>
Scale to apply to vec_to_scale[2]
*/
const double vec_to_scale[2] ,/* <I>
The second two dimensional vector which is scaled.
*/
double vec_comb[2] /* <O>
Vector sum of unscaled vector and scaled vector
where vec_comb = vec + (scale * vec_to_scale)
*/
);/* <NEC> */
/******************************************************************************
Calculates the scale factors of a linear combination of two vectors that
form a third vector. The vector combination is equal to the sum of the
two scaled vectors ( i.e., vec_comb = scale1 * vec1 + scale2 + vec2).
Return:
0 = Scale factors can be calculated
1 = Input vectors are parallel
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT int UF_VEC2_components(
const double vec1[2] ,/* <I>
First vector of linear combination
*/
const double vec2[2] ,/* <I>
Second vector of linear combination
*/
const double vec_comb[2] ,/* <I>
Linear combination of vec1 and vec2
*/
double tolerance ,/* <I>
Tolerance value to use for checking whether vec1
and vec2 are parallel
*/
double * scale1 ,/* <O>
Scale factor of vec1 in linear combination
*/
double * scale2 /* <O>
Scale factor of vec2 in linear combination
*/
);
/******************************************************************************
Calculates the position of a point between the two end points of a line
segment. The point on the line segment is defined by:
pnt_on_seg = (parameter * pnt1) + ((1.0 - parameter) * pnt2).
Environment: Internal and External
Return:
Void.
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC2_convex_comb(
double parameter ,/* <I>
Parameter of point to calculate
*/
const double pnt1[2] ,/* <I>
First end point of line segment
*/
const double pnt2[2] ,/* <I>
Second end point of line segment
*/
double pnt_on_seg[2] /* <O>
Point on line segment
*/
);/* <NEC> */
/******************************************************************************
Copies the vector coordinates from a source vector to a destination
vector (vec_dst = vec_src).
Return:
void.
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC2_copy(
const double vec_src[2] ,/* <I>
Source vector
*/
double vec_dst[2] /* <O>
Destination vector
*/
);/* <NEC> */
/******************************************************************************
Calculates the cross product of two vectors.
Return:
void.
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC2_cross(
const double vec1[2] ,/* <I>
Vector 1
*/
const double vec2[2] ,/* <I>
Vector 2
*/
double * cross_product /* <O>
The cross product of vec1 and vec2
cross_product = vec1 x vec2
*/
);/* <NEC> */
/*****************************************************************************
Calculates the distance between two points.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC2_distance(
const double pnt1[2] ,/* <I>
Point 1
*/
const double pnt2[2] ,/* <I>
Point 2
*/
double * distance /* <O>
The distance between pnt1 and pnt2
(distance = ||pnt1 - pnt2||)
*/
);/* <NEC> */
/******************************************************************************
Calculates the dot product of vec1 and vec2.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_dot(
const double vec1[2] ,/* <I>
Vector 1
*/
const double vec2[2] ,/* <I>
Vector 2
*/
double * dot_product /* <O>
The dot product of vec1 and vec2
dot_product = vec1 (dot) vec2
*/
);/* <NEC> */
/******************************************************************************
Determines if two vectors are equal within the specified tolerance.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_is_equal(
const double vec1[2] ,/* <I>
Vector 1
*/
const double vec2[2] ,/* <I>
Vector 2
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
int * is_equal /* <O>
0 = Vectors are not equal
1 = Vectors are equal
*/
);/* <NEC> */
/******************************************************************************
Determines if a vector is zero within the specified tolerance.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_is_zero(
const double vec[2] ,/* <I>
Vector to test
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
int * is_zero /* <O>
0 = Vectors is not zero
1 = Vectors is zero
*/
);/* <NEC> */
/******************************************************************************
Calculates the vector linear combination of two vectors with the
specified scale values.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_linear_comb(
double scale1 ,/* <I>
Scale value for vector 1
*/
const double vec1[2] ,/* <I>
Vector 1
*/
double scale2 ,/* <I>
scale for vector 2
*/
const double vec2[2] ,/* <I>
Vector 2
*/
double vec_comb[2] /* <O>
Vector linear combination
vec_comb = (scale * vec1) + (scale2 * vec2)
*/
);/* <NEC> */
/******************************************************************************
Calculates the magnitude of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_mag(
const double vec[2] ,/* <I>
Vector whose magnitude is required
*/
double * magnitude /* <O>
Magnitude of vector
magnitude = ||vec||
*/
);/* <NEC> */
/*****************************************************************************
Calculates the coordinates of the mid-point on a line segment.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_midpt(
const double pnt1[2] ,/* <I>
End Point #1 of line segment
*/
const double pnt2[2] ,/* <I>
End Point #2 of line segment
*/
double mid_pnt[2] /* <O>
Mid-point of line segment
mid_pnt = (0.5 * pnt1) + (0.5 * pnt2)
*/
);/* <NEC> */
/*****************************************************************************
Calculates the negative of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC2_negate(
const double vec[2] ,/* <I>
Vector to negate
*/
double negated_vec[2] /* <O>
Negated vector
negated_vec = (-1.0) x vec
*/
);/* <NEC> */
/*****************************************************************************
Rotates a 2D vector about a line perpendicular to the plane of the
vector through the vector origin.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC2_rotate(
const double vec[2] ,/* <I>
Vector to rotate
*/
double angle ,/* <I>
Angle to rotate through (in radians)
*/
double rotated_vec[2] /* <O>
Rotated vector
*/
);/* <NEC> */
/*****************************************************************************
Scales the coordinates of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC2_scale(
double scale ,/* <I>
Scale factor
*/
const double vec[2] ,/* <I>
Vector to scale
*/
double scaled_vec[2] /* <O>
scaled vector
scaled_vec = (scale x vec)
*/
);/* <NEC> */
/*****************************************************************************
Subtracts one 2D vector from another.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC2_sub(
const double vec1[2] ,/* <I>
Vector to subtract from
*/
const double vec2[2] ,/* <I>
Vector to subtract
*/
double vec_diff[2] /* <O>
Vector difference
vec_diff = vec1 - vec2
*/
);/* <NEC> */
/*****************************************************************************
Unitizes a 2D vector.
Return:
0 = Success (unit vector can be calculated)
1 = input vector is zero
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT int UF_VEC2_unitize(
const double vec[2] ,/* <I>
Vector to unitize
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
double * magnitude ,/* <O>
Vector magnitude = øvecø
*/
double unit_vec[2] /* <O>
Unitized vector = vec/øvecø
*/
);
/******************************************************************************
Converts a 2D vector to a 3D vector. Sets the Z-coordinate to zero.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_vec3(
const double vec_2D[2] ,/* <I>
2D vector to convert to 3D
*/
double vec_3D[3] /* <O>
3D vector
*/
);/* <NEC> */
/*****************************************************************************
Returns a 2D vector that is perpendicular to the input vector
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_ask_perpendicular
(
const double vec1[2], /* <I>
2D vector */
double vec_perp[2] /* <O>
2D vector */
);/* <NEC> */
/*****************************************************************************
Determine if vectors are parallel within an input tolerance. If the sine of
the angle between vec1 and vec2 is 0 then TRUE is returned. Otherwise FALSE
is returned.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_is_parallel
(
const double vec1[2], /* <I>
2D vector */
const double vec2[2], /* <I>
2D vector */
double tolerance, /* <I>
tolerance */
int *is_parallel /* <O>
= 0 Vectors are not parallel
= 1 Vectors are parallel */
);/* <NEC> */
/******************************************************************************
Determine if vectors are perpendicular within an input tolerance. If the cosine
of the angle between vec1 and vec2 is 0 then TRUE is returned. Otherwise FALSE
is returned.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC2_is_perpendicular
(
const double vec1[2], /* <I>
2D vector */
const double vec2[2], /* <I>
2D vector */
double tolerance, /* <I>
tolerance */
int *is_perp /* <O>
= 0 Vectors are not perpendicular
= 1 Vectors are perpendicular */
);/* <NEC> */
/*
********************************************************************************
*
* Prototypes of functions used to initialize, access, and manipulate
* 3D points and vectors.
*
********************************************************************************
*/
/******************************************************************************
Performs a three dimensional vector addition and returns the vector
sum in vec_sum[3].
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_add(
const double vec1[3] ,/* <I>
The first three dimensional vector
*/
const double vec2[3] ,/* <I>
The second three dimensional vector
*/
double vec_sum[3] /* <O>
The vector sum of vectors one and two
vec_sum = vec1 + vec2
*/
);/* <NEC> */
/******************************************************************************
Performs a vector affine combination which consists of adding an
unscaled vector to a scaled vector. The first vector you input is vec[3],
which is unscaled. The second vector you input is the vec_to_scale[3]
which is scaled by the input argument scale. The resultant vector is
output to vec_comb[3].
Return:
void.
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC3_affine_comb(
const double vec[3] ,/* <I>
Unscaled vector
*/
double scale ,/* <I>
Scale to apply to vec_to_scale[3]
*/
const double vec_to_scale[3] ,/* <I>
The second three dimensional vector which is scaled.
*/
double vec_comb[3] /* <O>
Vector sum of unscaled vector and scaled vector
where vec_comb = vec + (scale * vec_to_scale)
*/
);/* <NEC> */
/******************************************************************************
Calculates the angle between two vectors using a third vector to
determine the direction. The third vector is one that is perpendicular
to both the vec_from and vec_to vectors. For example, if the two
vectors lie in the x-y plane, then the third vector would be parallel to
the z-axis.
Return:
void.
Environment: Internal and External
See Also:
History:
******************************************************************************/
extern UFUNEXPORT void UF_VEC3_angle_between(
const double vec_from[3] ,/* <I>
Vector to calculate angle from
*/
const double vec_to[3] ,/* <I>
Vector to calculate angle to
*/
const double vec_ccw[3] ,/* <I>
Vector to define counter-clockwise orientation
*/
double * angle /* <O>
Angle between vec_from and vec_to using vec_ccw
to determine positive orientation. The angle is in
radians and 0.0 <= (*angle) < 2 PI.
*/
);/* <NEC> */
/*****************************************************************************
Calculates the position of a point between the two end points of a line
segment. The point on the line segment is defined by:
pnt_on_seg = (parameter * pnt1) + ((1.0 - parameter) * pnt2).
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_convex_comb(
double parameter ,/* <I>
Parameter of point to calculate
*/
const double pnt1[3] ,/* <I>
First end point of line segment
*/
const double pnt2[3] ,/* <I>
Second end point of line segment
*/
double pnt_on_seg[3] /* <O>
Point on line segment
*/
);/* <NEC> */
/*****************************************************************************
Copies the vector coordinates from a source vector to a destination
vector (vec_dst = vec_src).
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_copy(
const double vec_src[3] ,/* <I>
Source vector
*/
double vec_dst[3] /* <O>
Destination vector
*/
);/* <NEC> */
/*****************************************************************************
Calculates the cross product of two vectors.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_cross(
const double vec1[3] ,/* <I>
Vector 1
*/
const double vec2[3] ,/* <I>
Vector 2
*/
double cross_product[3] /* <O>
The cross product of vec1 and vec2
cross_product = vec1 * vec2
*/
);/* <NEC> */
/*****************************************************************************
Calculates the distance between two points.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_distance(
const double pnt1[3] ,/* <I>
Point 1
*/
const double pnt2[3] ,/* <I>
Point 2
*/
double * distance /* <O>
The distance between pnt1 and pnt2
(distance = ||pnt1 - pnt2||)
*/
);
/*****************************************************************************
Calculates the normal distance from a point to a plane.
Return:
0 = Success (distance can be calculated)
1 = The plane normal is zero
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT int UF_VEC3_distance_to_plane(
const double pnt1[3] ,/* <I>
Point to calculate distance from
*/
const double pnt_on_plane[3] ,/* <I>
Point located on the plane
*/
const double plane_normal[3] ,/* <I>
Plane normal
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
double * distance /* <O>
The normal distance from the point to the plane
*/
);
/******************************************************************************
Calculates the dot product of vec1 and vec2.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_dot(
const double vec1[3] ,/* <I>
Vector 1
*/
const double vec2[3] ,/* <I>
Vector 2
*/
double * dot_product /* <O>
The dot product of vec1 and vec2
dot_product = vec1 (dot) vec2
*/
);/* <NEC> */
/*****************************************************************************
Determines if a vector is zero within the specified tolerance.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_is_zero(
const double vec[3] ,/* <I>
Vector to test
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
int * is_zero /* <O>
0 = Vectors is not zero
1 = Vectors is zero
*/
);/* <NEC> */
/*****************************************************************************
Determines if two vectors are equal within the specified tolerance.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_is_equal(
const double vec1[3] ,/* <I>
Vector 1
*/
const double vec2[3] ,/* <I>
Vector 2
*/
double tolerance ,/* <I>
Tolerance value to use for checking
*/
int * is_equal /* <O>
0 = Vectors are not equal
1 = Vectors are equal
*/
);/* <NEC> */
/*****************************************************************************
Calculates the vector linear combination of two vectors with the
specified scale values.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_linear_comb(
double scale1 ,/* <I>
Scale value for vector 1
*/
const double vec1[3] ,/* <I>
Vector 1
*/
double scale2 ,/* <I>
scale for vector 2
*/
const double vec2[3] ,/* <I>
Vector 2
*/
double vec_comb[3] /* <O>
Vector linear combination
vec_comb = (scale * vec1) + (scale2 * vec2)
*/
);/* <NEC> */
/******************************************************************************
Calculates the magnitude of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_mag(
const double vec[3] ,/* <I>
Vector whose magnitude is required
*/
double * magnitude /* <O>
Magnitude of vector
magnitude = ||vec||
*/
);/* <NEC> */
/*****************************************************************************
Calculates the coordinates of the mid-point on a line segment.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_midpt(
const double pnt1[3] ,/* <I>
End Point #1 of line segment
*/
const double pnt2[3] ,/* <I>
End Point #2 of line segment
*/
double mid_pnt[3] /* <O>
Mid-point of line segment
mid_pnt = (0.5 * pnt1) + (0.5 * pnt2)
*/
);/* <NEC> */
/*****************************************************************************
Calculates the negative of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_negate(
const double vec[3] ,/* <I>
Vector to negate
*/
double negated_vec[3] /* <O>
Negated vector
negated_vec = (-1.0) * vec
*/
);/* <NEC> */
/*****************************************************************************
Scales the coordinates of a vector.
Return:
void.
Environment: Internal and External
See Also:
History:
****************************************************************************/
extern UFUNEXPORT void UF_VEC3_scale(
double scale ,/* <I>
Scale factor
*/
const double vec[3] ,/* <I>
Vector to scale
*/
double scaled_vec[3] /* <O>
scaled vector
scaled_vec = (scale x vec)
*/
);/* <NEC> */
/*****************************************************************************
Subtracts one vector from another.
Return:
void.
Environment: Internal and External
See Also:
History:
*****************************************************************************/
extern UFUNEXPORT void UF_VEC3_sub(
const double vec1[3] ,/* <I>
Vector to subtract from
*/
const double vec2[3] ,/* <I>
Vector to subtract
*/
double vec_diff[3] /* <O>
Vector difference