1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.7 |
static const char RCSid[] = "$Id: bbox.c,v 2.6 2005/06/14 17:10:06 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
* bbox.c - routines for bounding box computation. |
6 |
greg |
2.2 |
*/ |
7 |
|
|
|
8 |
greg |
2.4 |
#include "copyright.h" |
9 |
greg |
1.1 |
|
10 |
|
|
#include "standard.h" |
11 |
|
|
#include "object.h" |
12 |
greg |
2.2 |
#include "octree.h" |
13 |
greg |
1.1 |
#include "otypes.h" |
14 |
|
|
#include "face.h" |
15 |
|
|
#include "cone.h" |
16 |
schorsch |
2.5 |
#include "instance.h" |
17 |
|
|
#include "mesh.h" |
18 |
|
|
#include "oconv.h" |
19 |
greg |
1.1 |
|
20 |
|
|
|
21 |
schorsch |
2.5 |
static void point2bbox(FVECT p, FVECT bbmin, FVECT bbmax); |
22 |
|
|
static void circle2bbox(FVECT cent, FVECT norm, double rad, FVECT bbmin, FVECT bbmax); |
23 |
greg |
2.4 |
|
24 |
greg |
1.1 |
|
25 |
schorsch |
2.5 |
void |
26 |
|
|
add2bbox( /* expand bounding box to fit object */ |
27 |
|
|
register OBJREC *o, |
28 |
|
|
FVECT bbmin, |
29 |
|
|
FVECT bbmax |
30 |
|
|
) |
31 |
greg |
1.1 |
{ |
32 |
greg |
1.2 |
CONE *co; |
33 |
|
|
FACE *fo; |
34 |
|
|
INSTANCE *io; |
35 |
greg |
2.4 |
MESHINST *mi; |
36 |
greg |
1.1 |
FVECT v; |
37 |
|
|
register int i, j; |
38 |
|
|
|
39 |
|
|
switch (o->otype) { |
40 |
|
|
case OBJ_SPHERE: |
41 |
|
|
case OBJ_BUBBLE: |
42 |
|
|
if (o->oargs.nfargs != 4) |
43 |
|
|
objerror(o, USER, "bad arguments"); |
44 |
|
|
for (i = 0; i < 3; i++) { |
45 |
|
|
VCOPY(v, o->oargs.farg); |
46 |
|
|
v[i] -= o->oargs.farg[3]; |
47 |
|
|
point2bbox(v, bbmin, bbmax); |
48 |
|
|
v[i] += 2.0 * o->oargs.farg[3]; |
49 |
|
|
point2bbox(v, bbmin, bbmax); |
50 |
|
|
} |
51 |
|
|
break; |
52 |
|
|
case OBJ_FACE: |
53 |
|
|
fo = getface(o); |
54 |
|
|
j = fo->nv; |
55 |
|
|
while (j--) |
56 |
|
|
point2bbox(VERTEX(fo,j), bbmin, bbmax); |
57 |
|
|
break; |
58 |
|
|
case OBJ_CONE: |
59 |
|
|
case OBJ_CUP: |
60 |
|
|
case OBJ_CYLINDER: |
61 |
|
|
case OBJ_TUBE: |
62 |
|
|
case OBJ_RING: |
63 |
|
|
co = getcone(o, 0); |
64 |
greg |
2.7 |
if (co == NULL) |
65 |
|
|
break; |
66 |
greg |
1.1 |
if (o->otype != OBJ_RING) |
67 |
|
|
circle2bbox(CO_P0(co), co->ad, CO_R0(co), bbmin, bbmax); |
68 |
|
|
circle2bbox(CO_P1(co), co->ad, CO_R1(co), bbmin, bbmax); |
69 |
|
|
break; |
70 |
|
|
case OBJ_INSTANCE: |
71 |
greg |
1.3 |
io = getinstance(o, IO_BOUNDS); |
72 |
greg |
1.1 |
for (j = 0; j < 8; j++) { |
73 |
|
|
for (i = 0; i < 3; i++) { |
74 |
|
|
v[i] = io->obj->scube.cuorg[i]; |
75 |
|
|
if (j & 1<<i) |
76 |
|
|
v[i] += io->obj->scube.cusize; |
77 |
|
|
} |
78 |
greg |
1.4 |
multp3(v, v, io->x.f.xfm); |
79 |
greg |
2.4 |
point2bbox(v, bbmin, bbmax); |
80 |
|
|
} |
81 |
|
|
break; |
82 |
|
|
case OBJ_MESH: |
83 |
|
|
mi = getmeshinst(o, IO_BOUNDS); |
84 |
|
|
for (j = 0; j < 8; j++) { |
85 |
|
|
for (i = 0; i < 3; i++) { |
86 |
|
|
v[i] = mi->msh->mcube.cuorg[i]; |
87 |
|
|
if (j & 1<<i) |
88 |
|
|
v[i] += mi->msh->mcube.cusize; |
89 |
|
|
} |
90 |
|
|
multp3(v, v, mi->x.f.xfm); |
91 |
greg |
1.1 |
point2bbox(v, bbmin, bbmax); |
92 |
|
|
} |
93 |
|
|
break; |
94 |
|
|
} |
95 |
|
|
} |
96 |
|
|
|
97 |
|
|
|
98 |
schorsch |
2.5 |
static void |
99 |
|
|
point2bbox( /* expand bounding box to fit point */ |
100 |
|
|
register FVECT p, |
101 |
|
|
register FVECT bbmin, |
102 |
|
|
register FVECT bbmax |
103 |
|
|
) |
104 |
greg |
1.1 |
{ |
105 |
|
|
register int i; |
106 |
|
|
|
107 |
|
|
for (i = 0; i < 3; i++) { |
108 |
|
|
if (p[i] < bbmin[i]) |
109 |
|
|
bbmin[i] = p[i]; |
110 |
|
|
if (p[i] > bbmax[i]) |
111 |
|
|
bbmax[i] = p[i]; |
112 |
|
|
} |
113 |
|
|
} |
114 |
|
|
|
115 |
|
|
|
116 |
schorsch |
2.5 |
static void |
117 |
|
|
circle2bbox( /* expand bbox to fit circle */ |
118 |
|
|
FVECT cent, |
119 |
|
|
FVECT norm, |
120 |
|
|
double rad, |
121 |
|
|
FVECT bbmin, |
122 |
|
|
FVECT bbmax |
123 |
|
|
) |
124 |
greg |
1.1 |
{ |
125 |
greg |
2.6 |
double d, r; |
126 |
|
|
register int i; |
127 |
greg |
1.1 |
|
128 |
|
|
for (i = 0; i < 3; i++) { |
129 |
greg |
2.6 |
r = sqrt(1. - norm[i]*norm[i]); |
130 |
|
|
d = cent[i] + r*rad; |
131 |
|
|
if (d > bbmax[i]) |
132 |
|
|
bbmax[i] = d; |
133 |
|
|
d = cent[i] - r*rad; |
134 |
|
|
if (d < bbmin[i]) |
135 |
|
|
bbmin[i] = d; |
136 |
greg |
1.1 |
} |
137 |
|
|
} |