1 |
greg |
2.5 |
/* Copyright (c) 1994 Regents of the University of California */ |
2 |
greg |
1.1 |
|
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 |
greg |
2.2 |
#include "func.h" |
19 |
|
|
|
20 |
greg |
1.1 |
/* |
21 |
|
|
* The arguments for MAT_DIRECT1 are: |
22 |
|
|
* |
23 |
greg |
1.3 |
* 5+ coef1 dx1 dy1 dz1 funcfile transform.. |
24 |
greg |
1.1 |
* 0 |
25 |
|
|
* n A1 A2 .. An |
26 |
|
|
* |
27 |
|
|
* The arguments for MAT_DIRECT2 are: |
28 |
|
|
* |
29 |
greg |
1.3 |
* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform.. |
30 |
greg |
1.1 |
* 0 |
31 |
|
|
* n A1 A2 .. An |
32 |
|
|
*/ |
33 |
|
|
|
34 |
|
|
|
35 |
|
|
int dir_proj(); |
36 |
|
|
VSMATERIAL direct1_vs = {dir_proj, 1}; |
37 |
|
|
VSMATERIAL direct2_vs = {dir_proj, 2}; |
38 |
|
|
|
39 |
greg |
2.2 |
#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \ |
40 |
|
|
getfunc(m, 4, 0xf, 1) : \ |
41 |
|
|
getfunc(m, 8, 0xff, 1) ) |
42 |
greg |
1.1 |
|
43 |
greg |
1.6 |
|
44 |
greg |
1.1 |
m_direct(m, r) /* shade redirected ray */ |
45 |
|
|
register OBJREC *m; |
46 |
|
|
register RAY *r; |
47 |
|
|
{ |
48 |
|
|
/* check if source ray */ |
49 |
|
|
if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
50 |
greg |
2.4 |
return(1); /* got the wrong guy */ |
51 |
greg |
1.1 |
/* compute first projection */ |
52 |
|
|
if (m->otype == MAT_DIRECT1 || |
53 |
|
|
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0)) |
54 |
|
|
redirect(m, r, 0); |
55 |
|
|
/* compute second projection */ |
56 |
|
|
if (m->otype == MAT_DIRECT2 && |
57 |
|
|
(r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1)) |
58 |
|
|
redirect(m, r, 1); |
59 |
greg |
2.4 |
return(1); |
60 |
greg |
1.1 |
} |
61 |
|
|
|
62 |
|
|
|
63 |
|
|
redirect(m, r, n) /* compute n'th ray redirection */ |
64 |
|
|
OBJREC *m; |
65 |
|
|
RAY *r; |
66 |
|
|
int n; |
67 |
|
|
{ |
68 |
greg |
2.2 |
MFUNC *mf; |
69 |
|
|
register EPNODE **va; |
70 |
greg |
2.3 |
FVECT nsdir; |
71 |
greg |
1.1 |
RAY nr; |
72 |
|
|
double coef; |
73 |
|
|
register int j; |
74 |
|
|
/* set up function */ |
75 |
greg |
2.2 |
mf = getdfunc(m); |
76 |
|
|
setfunc(m, r); |
77 |
greg |
2.3 |
/* assign direction variable */ |
78 |
|
|
if (r->rsrc >= 0) { |
79 |
|
|
register SRCREC *sp = source + source[r->rsrc].sa.sv.sn; |
80 |
|
|
|
81 |
|
|
if (sp->sflags & SDISTANT) |
82 |
|
|
VCOPY(nsdir, sp->sloc); |
83 |
|
|
else { |
84 |
|
|
for (j = 0; j < 3; j++) |
85 |
|
|
nsdir[j] = sp->sloc[j] - r->rop[j]; |
86 |
|
|
normalize(nsdir); |
87 |
|
|
} |
88 |
greg |
2.6 |
multv3(nsdir, nsdir, funcxf.xfm); |
89 |
|
|
varset("DxA", '=', nsdir[0]/funcxf.sca); |
90 |
|
|
varset("DyA", '=', nsdir[1]/funcxf.sca); |
91 |
|
|
varset("DzA", '=', nsdir[2]/funcxf.sca); |
92 |
|
|
} else { |
93 |
|
|
varset("DxA", '=', 0.0); |
94 |
|
|
varset("DyA", '=', 0.0); |
95 |
|
|
varset("DzA", '=', 0.0); |
96 |
|
|
} |
97 |
greg |
1.1 |
/* compute coefficient */ |
98 |
|
|
errno = 0; |
99 |
greg |
2.2 |
va = mf->ep + 4*n; |
100 |
|
|
coef = evalue(va[0]); |
101 |
greg |
1.1 |
if (errno) |
102 |
|
|
goto computerr; |
103 |
|
|
if (coef <= FTINY || rayorigin(&nr, r, TRANS, coef) < 0) |
104 |
|
|
return(0); |
105 |
greg |
2.2 |
va++; /* compute direction */ |
106 |
|
|
for (j = 0; j < 3; j++) { |
107 |
|
|
nr.rdir[j] = evalue(va[j]); |
108 |
|
|
if (errno) |
109 |
|
|
goto computerr; |
110 |
|
|
} |
111 |
|
|
if (mf->f != &unitxf) |
112 |
|
|
multv3(nr.rdir, nr.rdir, mf->f->xfm); |
113 |
greg |
1.4 |
if (r->rox != NULL) |
114 |
|
|
multv3(nr.rdir, nr.rdir, r->rox->f.xfm); |
115 |
|
|
if (normalize(nr.rdir) == 0.0) |
116 |
|
|
goto computerr; |
117 |
greg |
1.1 |
/* compute value */ |
118 |
|
|
if (r->rsrc >= 0) |
119 |
|
|
nr.rsrc = source[r->rsrc].sa.sv.sn; |
120 |
|
|
rayvalue(&nr); |
121 |
|
|
scalecolor(nr.rcol, coef); |
122 |
|
|
addcolor(r->rcol, nr.rcol); |
123 |
greg |
2.7 |
if (r->ro != NULL && isflat(r->ro->otype)) |
124 |
|
|
r->rt = r->rot + nr.rt; |
125 |
greg |
1.1 |
return(1); |
126 |
|
|
computerr: |
127 |
|
|
objerror(m, WARNING, "compute error"); |
128 |
|
|
return(-1); |
129 |
|
|
} |
130 |
|
|
|
131 |
|
|
|
132 |
|
|
dir_proj(pm, o, s, n) /* compute a director's projection */ |
133 |
|
|
MAT4 pm; |
134 |
|
|
OBJREC *o; |
135 |
|
|
SRCREC *s; |
136 |
|
|
int n; |
137 |
|
|
{ |
138 |
|
|
RAY tr; |
139 |
greg |
2.2 |
OBJREC *m; |
140 |
|
|
MFUNC *mf; |
141 |
|
|
EPNODE **va; |
142 |
greg |
1.1 |
FVECT cent, newdir, nv, h; |
143 |
greg |
2.2 |
double coef, olddot, newdot, od; |
144 |
greg |
1.1 |
register int i, j; |
145 |
|
|
/* initialize test ray */ |
146 |
|
|
getmaxdisk(cent, o); |
147 |
|
|
if (s->sflags & SDISTANT) |
148 |
|
|
for (i = 0; i < 3; i++) { |
149 |
|
|
tr.rdir[i] = -s->sloc[i]; |
150 |
|
|
tr.rorg[i] = cent[i] - tr.rdir[i]; |
151 |
|
|
} |
152 |
|
|
else { |
153 |
|
|
for (i = 0; i < 3; i++) { |
154 |
|
|
tr.rdir[i] = cent[i] - s->sloc[i]; |
155 |
greg |
1.2 |
tr.rorg[i] = s->sloc[i]; |
156 |
greg |
1.1 |
} |
157 |
|
|
if (normalize(tr.rdir) == 0.0) |
158 |
|
|
return(0); /* at source! */ |
159 |
|
|
} |
160 |
|
|
od = getplaneq(nv, o); |
161 |
|
|
olddot = DOT(tr.rdir, nv); |
162 |
|
|
if (olddot <= FTINY && olddot >= -FTINY) |
163 |
|
|
return(0); /* old dir parallels plane */ |
164 |
greg |
2.5 |
tr.rmax = 0.0; |
165 |
greg |
1.1 |
rayorigin(&tr, NULL, PRIMARY, 1.0); |
166 |
|
|
if (!(*ofun[o->otype].funp)(o, &tr)) |
167 |
|
|
return(0); /* no intersection! */ |
168 |
|
|
/* compute redirection */ |
169 |
greg |
2.2 |
m = vsmaterial(o); |
170 |
|
|
mf = getdfunc(m); |
171 |
|
|
setfunc(m, &tr); |
172 |
greg |
2.3 |
varset("DxA", '=', 0.0); |
173 |
|
|
varset("DyA", '=', 0.0); |
174 |
|
|
varset("DzA", '=', 0.0); |
175 |
greg |
1.1 |
errno = 0; |
176 |
greg |
2.2 |
va = mf->ep + 4*n; |
177 |
|
|
coef = evalue(va[0]); |
178 |
greg |
1.1 |
if (errno) |
179 |
|
|
goto computerr; |
180 |
greg |
2.2 |
if (coef <= FTINY) |
181 |
|
|
return(0); /* insignificant */ |
182 |
|
|
va++; |
183 |
|
|
for (i = 0; i < 3; i++) { |
184 |
|
|
newdir[i] = evalue(va[i]); |
185 |
|
|
if (errno) |
186 |
|
|
goto computerr; |
187 |
|
|
} |
188 |
|
|
if (mf->f != &unitxf) |
189 |
|
|
multv3(newdir, newdir, mf->f->xfm); |
190 |
greg |
1.4 |
/* normalization unnecessary */ |
191 |
greg |
1.1 |
newdot = DOT(newdir, nv); |
192 |
|
|
if (newdot <= FTINY && newdot >= -FTINY) |
193 |
|
|
return(0); /* new dir parallels plane */ |
194 |
|
|
/* everything OK -- compute shear */ |
195 |
|
|
for (i = 0; i < 3; i++) |
196 |
greg |
1.4 |
h[i] = newdir[i]/newdot - tr.rdir[i]/olddot; |
197 |
greg |
1.1 |
setident4(pm); |
198 |
|
|
for (j = 0; j < 3; j++) { |
199 |
|
|
for (i = 0; i < 3; i++) |
200 |
|
|
pm[i][j] += nv[i]*h[j]; |
201 |
|
|
pm[3][j] = -od*h[j]; |
202 |
|
|
} |
203 |
|
|
if (newdot > 0.0 ^ olddot > 0.0) /* add mirroring */ |
204 |
|
|
for (j = 0; j < 3; j++) { |
205 |
|
|
for (i = 0; i < 3; i++) |
206 |
|
|
pm[i][j] -= 2.*nv[i]*nv[j]; |
207 |
|
|
pm[3][j] += 2.*od*nv[j]; |
208 |
|
|
} |
209 |
|
|
return(1); |
210 |
|
|
computerr: |
211 |
|
|
objerror(m, WARNING, "projection compute error"); |
212 |
|
|
return(0); |
213 |
|
|
} |