1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
|
|
|
3 |
|
|
#ifndef lint |
4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
5 |
|
|
#endif |
6 |
|
|
|
7 |
|
|
/* |
8 |
|
|
* Routines for light-redirecting materials and |
9 |
|
|
* their associated virtual light sources |
10 |
|
|
*/ |
11 |
|
|
|
12 |
|
|
#include "ray.h" |
13 |
|
|
|
14 |
|
|
#include "otypes.h" |
15 |
|
|
|
16 |
|
|
#include "source.h" |
17 |
|
|
|
18 |
|
|
/* |
19 |
|
|
* The arguments for MAT_DIRECT1 are: |
20 |
|
|
* |
21 |
greg |
1.3 |
* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
22 |
greg |
1.1 |
* 0 |
23 |
|
|
* n A1 A2 .. An |
24 |
|
|
* |
25 |
|
|
* The arguments for MAT_DIRECT2 are: |
26 |
|
|
* |
27 |
greg |
1.3 |
* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
28 |
greg |
1.1 |
* 0 |
29 |
|
|
* n A1 A2 .. An |
30 |
|
|
*/ |
31 |
|
|
|
32 |
|
|
|
33 |
|
|
extern double varvalue(); |
34 |
|
|
|
35 |
|
|
int dir_proj(); |
36 |
|
|
VSMATERIAL direct1_vs = {dir_proj, 1}; |
37 |
|
|
VSMATERIAL direct2_vs = {dir_proj, 2}; |
38 |
|
|
|
39 |
|
|
|
40 |
|
|
m_direct(m, r) /* shade redirected ray */ |
41 |
|
|
register OBJREC *m; |
42 |
|
|
register RAY *r; |
43 |
|
|
{ |
44 |
|
|
/* check if source ray */ |
45 |
|
|
if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
46 |
|
|
return; /* got the wrong guy */ |
47 |
greg |
1.3 |
dir_check(m); |
48 |
greg |
1.1 |
/* compute first projection */ |
49 |
|
|
if (m->otype == MAT_DIRECT1 || |
50 |
|
|
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
51 |
|
|
redirect(m, r, 0); |
52 |
|
|
/* compute second projection */ |
53 |
|
|
if (m->otype == MAT_DIRECT2 && |
54 |
|
|
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
55 |
|
|
redirect(m, r, 1); |
56 |
|
|
} |
57 |
|
|
|
58 |
|
|
|
59 |
|
|
redirect(m, r, n) /* compute n'th ray redirection */ |
60 |
|
|
OBJREC *m; |
61 |
|
|
RAY *r; |
62 |
|
|
int n; |
63 |
|
|
{ |
64 |
|
|
register char **sa; |
65 |
|
|
RAY nr; |
66 |
|
|
double coef; |
67 |
|
|
register int j; |
68 |
|
|
/* set up function */ |
69 |
greg |
1.4 |
setmap(m, r, &((FULLXF *)m->os)->b); |
70 |
greg |
1.1 |
sa = m->oargs.sarg + 4*n; |
71 |
|
|
/* compute coefficient */ |
72 |
|
|
errno = 0; |
73 |
|
|
coef = varvalue(sa[0]); |
74 |
|
|
if (errno) |
75 |
|
|
goto computerr; |
76 |
|
|
if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
77 |
|
|
return(0); |
78 |
|
|
/* compute direction */ |
79 |
|
|
errno = 0; |
80 |
|
|
for (j = 0; j < 3; j++) |
81 |
|
|
nr.rdir[j] = varvalue(sa[j+1]); |
82 |
greg |
1.4 |
if (errno) |
83 |
greg |
1.1 |
goto computerr; |
84 |
greg |
1.4 |
multv3(nr.rdir, nr.rdir, ((FULLXF *)m->os)->f.xfm); |
85 |
|
|
if (r->rox != NULL) |
86 |
|
|
multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
87 |
|
|
if (normalize(nr.rdir) == 0.0) |
88 |
|
|
goto computerr; |
89 |
greg |
1.1 |
/* compute value */ |
90 |
|
|
if (r->rsrc >= 0) |
91 |
|
|
nr.rsrc = source[r->rsrc].sa.sv.sn; |
92 |
|
|
rayvalue(&nr); |
93 |
|
|
scalecolor(nr.rcol, coef); |
94 |
|
|
addcolor(r->rcol, nr.rcol); |
95 |
|
|
return(1); |
96 |
|
|
computerr: |
97 |
|
|
objerror(m, WARNING, "compute error"); |
98 |
|
|
return(-1); |
99 |
|
|
} |
100 |
|
|
|
101 |
|
|
|
102 |
|
|
dir_proj(pm, o, s, n) /* compute a director's projection */ |
103 |
|
|
MAT4 pm; |
104 |
|
|
OBJREC *o; |
105 |
|
|
SRCREC *s; |
106 |
|
|
int n; |
107 |
|
|
{ |
108 |
|
|
RAY tr; |
109 |
|
|
register OBJREC *m; |
110 |
|
|
char **sa; |
111 |
|
|
FVECT cent, newdir, nv, h; |
112 |
|
|
double olddot, newdot, od; |
113 |
|
|
register int i, j; |
114 |
|
|
/* get material arguments */ |
115 |
|
|
m = objptr(o->omod); |
116 |
greg |
1.3 |
dir_check(m); |
117 |
greg |
1.1 |
sa = m->oargs.sarg + 4*n; |
118 |
|
|
/* initialize test ray */ |
119 |
|
|
getmaxdisk(cent, o); |
120 |
|
|
if (s->sflags & SDISTANT) |
121 |
|
|
for (i = 0; i < 3; i++) { |
122 |
|
|
tr.rdir[i] = -s->sloc[i]; |
123 |
|
|
tr.rorg[i] = cent[i] - tr.rdir[i]; |
124 |
|
|
} |
125 |
|
|
else { |
126 |
|
|
for (i = 0; i < 3; i++) { |
127 |
|
|
tr.rdir[i] = cent[i] - s->sloc[i]; |
128 |
greg |
1.2 |
tr.rorg[i] = s->sloc[i]; |
129 |
greg |
1.1 |
} |
130 |
|
|
if (normalize(tr.rdir) == 0.0) |
131 |
|
|
return(0); /* at source! */ |
132 |
|
|
} |
133 |
|
|
od = getplaneq(nv, o); |
134 |
|
|
olddot = DOT(tr.rdir, nv); |
135 |
|
|
if (olddot <= FTINY && olddot >= -FTINY) |
136 |
|
|
return(0); /* old dir parallels plane */ |
137 |
|
|
rayorigin(&tr, NULL, PRIMARY, 1.0); |
138 |
|
|
if (!(*ofun[o->otype].funp)(o, &tr)) |
139 |
|
|
return(0); /* no intersection! */ |
140 |
|
|
/* compute redirection */ |
141 |
greg |
1.4 |
setmap(m, &tr, &((FULLXF *)m->os)->b); |
142 |
greg |
1.1 |
errno = 0; |
143 |
|
|
if (varvalue(sa[0]) <= FTINY) |
144 |
|
|
return(0); /* insignificant */ |
145 |
|
|
if (errno) |
146 |
|
|
goto computerr; |
147 |
|
|
for (i = 0; i < 3; i++) |
148 |
|
|
newdir[i] = varvalue(sa[i+1]); |
149 |
|
|
if (errno) |
150 |
|
|
goto computerr; |
151 |
greg |
1.4 |
multv3(newdir, newdir, ((FULLXF *)m->os)->f.xfm); |
152 |
|
|
/* normalization unnecessary */ |
153 |
greg |
1.1 |
newdot = DOT(newdir, nv); |
154 |
|
|
if (newdot <= FTINY && newdot >= -FTINY) |
155 |
|
|
return(0); /* new dir parallels plane */ |
156 |
|
|
/* everything OK -- compute shear */ |
157 |
|
|
for (i = 0; i < 3; i++) |
158 |
greg |
1.4 |
h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
159 |
greg |
1.1 |
setident4(pm); |
160 |
|
|
for (j = 0; j < 3; j++) { |
161 |
|
|
for (i = 0; i < 3; i++) |
162 |
|
|
pm[i][j] += nv[i]*h[j]; |
163 |
|
|
pm[3][j] = -od*h[j]; |
164 |
|
|
} |
165 |
|
|
if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */ |
166 |
|
|
for (j = 0; j < 3; j++) { |
167 |
|
|
for (i = 0; i < 3; i++) |
168 |
|
|
pm[i][j] -= 2.*nv[i]*nv[j]; |
169 |
|
|
pm[3][j] += 2.*od*nv[j]; |
170 |
|
|
} |
171 |
|
|
return(1); |
172 |
|
|
computerr: |
173 |
|
|
objerror(m, WARNING, "projection compute error"); |
174 |
|
|
return(0); |
175 |
greg |
1.3 |
} |
176 |
|
|
|
177 |
|
|
|
178 |
|
|
static |
179 |
|
|
dir_check(m) /* check arguments and load function file */ |
180 |
|
|
register OBJREC *m; |
181 |
|
|
{ |
182 |
greg |
1.4 |
register FULLXF *mxf; |
183 |
greg |
1.3 |
register int ff; |
184 |
|
|
|
185 |
greg |
1.4 |
ff = m->otype == MAT_DIRECT1 ? 5 : 9; |
186 |
|
|
if (ff > m->oargs.nsargs) |
187 |
greg |
1.3 |
objerror(m, USER, "too few arguments"); |
188 |
|
|
if (!vardefined(m->oargs.sarg[0])) |
189 |
greg |
1.4 |
loadfunc(m->oargs.sarg[ff-1]); |
190 |
|
|
if (m->os == NULL) { |
191 |
|
|
mxf = (FULLXF *)malloc(sizeof(FULLXF)); |
192 |
|
|
if (mxf == NULL) |
193 |
|
|
error(SYSTEM, "out of memory in dir_check"); |
194 |
|
|
if (fullxf(mxf, m->oargs.nsargs-ff, m->oargs.sarg+ff) != |
195 |
|
|
m->oargs.nsargs-ff) |
196 |
|
|
objerror(m, USER, "bad transform"); |
197 |
|
|
if (mxf->f.sca < 0.0) |
198 |
|
|
mxf->f.sca = -mxf->f.sca; |
199 |
|
|
if (mxf->b.sca < 0.0) |
200 |
|
|
mxf->b.sca = -mxf->b.sca; |
201 |
|
|
m->os = (char *)mxf; |
202 |
|
|
} |
203 |
greg |
1.1 |
} |