1 |
greg |
2.15 |
/* Copyright (c) 1993 Regents of the University of California */ |
2 |
greg |
1.1 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
|
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* ambient.c - routines dealing with ambient (inter-reflected) component. |
9 |
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*/ |
10 |
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11 |
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#include "ray.h" |
12 |
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13 |
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#include "octree.h" |
14 |
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|
15 |
greg |
1.8 |
#include "otypes.h" |
16 |
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|
17 |
greg |
1.14 |
#include "ambient.h" |
18 |
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|
19 |
greg |
1.1 |
#include "random.h" |
20 |
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|
21 |
greg |
2.12 |
#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
22 |
greg |
1.1 |
|
23 |
greg |
1.14 |
typedef struct ambtree { |
24 |
greg |
2.12 |
AMBVAL *alist; /* ambient value list */ |
25 |
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struct ambtree *kid; /* 8 child nodes */ |
26 |
greg |
1.14 |
} AMBTREE; /* ambient octree */ |
27 |
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28 |
greg |
1.1 |
extern CUBE thescene; /* contains space boundaries */ |
29 |
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30 |
greg |
2.12 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
31 |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
32 |
greg |
1.1 |
|
33 |
greg |
2.12 |
double maxarad; /* maximum ambient radius */ |
34 |
|
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double minarad; /* minimum ambient radius */ |
35 |
greg |
1.1 |
|
36 |
greg |
2.12 |
static AMBTREE atrunk; /* our ambient trunk node */ |
37 |
greg |
1.1 |
|
38 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
39 |
greg |
2.16 |
static int nunflshed = 0; /* number of unflushed ambient values */ |
40 |
greg |
1.1 |
|
41 |
greg |
2.12 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
42 |
greg |
2.6 |
|
43 |
greg |
2.12 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
44 |
greg |
1.1 |
|
45 |
greg |
2.12 |
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
46 |
greg |
2.20 |
#define freeambtree(t) free((char *)(t)) |
47 |
greg |
1.1 |
|
48 |
greg |
2.7 |
extern long ftell(), lseek(); |
49 |
greg |
2.21 |
static int initambfile(), avsave(), avinsert(), loadatree(); |
50 |
greg |
2.20 |
static AMBVAL *avstore(); |
51 |
greg |
2.19 |
#ifdef F_SETLKW |
52 |
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static aflock(); |
53 |
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#endif |
54 |
greg |
1.1 |
|
55 |
greg |
2.7 |
|
56 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
57 |
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int ar; |
58 |
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{ |
59 |
greg |
2.21 |
ambres = ar < 0 ? 0 : ar; /* may be done already */ |
60 |
greg |
2.3 |
/* set min & max radii */ |
61 |
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if (ar <= 0) { |
62 |
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minarad = 0.0; |
63 |
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maxarad = thescene.cusize / 2.0; |
64 |
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} else { |
65 |
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minarad = thescene.cusize / ar; |
66 |
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maxarad = 16.0 * minarad; /* heuristic */ |
67 |
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if (maxarad > thescene.cusize / 2.0) |
68 |
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maxarad = thescene.cusize / 2.0; |
69 |
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} |
70 |
greg |
2.4 |
if (maxarad <= FTINY) |
71 |
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maxarad = .001; |
72 |
greg |
2.3 |
} |
73 |
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|
74 |
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|
75 |
greg |
2.21 |
setambacc(newa) /* set ambient accuracy */ |
76 |
greg |
2.20 |
double newa; |
77 |
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{ |
78 |
greg |
2.21 |
static double oldambacc = -1.0; |
79 |
greg |
2.20 |
AMBTREE oldatrunk; |
80 |
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|
81 |
greg |
2.21 |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
82 |
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if (oldambacc < -FTINY) |
83 |
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oldambacc = ambacc; /* do nothing first call */ |
84 |
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if (fabs(newa - oldambacc) < 0.01) |
85 |
greg |
2.20 |
return; /* insignificant -- don't bother */ |
86 |
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if (ambacc <= FTINY) |
87 |
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return; /* cannot build new tree */ |
88 |
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/* else need to rebuild tree */ |
89 |
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copystruct(&oldatrunk, &atrunk); |
90 |
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atrunk.alist = NULL; |
91 |
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atrunk.kid = NULL; |
92 |
greg |
2.21 |
loadatree(&oldatrunk); |
93 |
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oldambacc = ambacc; /* remeber setting for next call */ |
94 |
greg |
2.20 |
} |
95 |
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|
96 |
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|
97 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
98 |
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char *afile; |
99 |
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{ |
100 |
greg |
2.9 |
long headlen; |
101 |
greg |
2.12 |
AMBVAL amb; |
102 |
greg |
2.3 |
/* init ambient limits */ |
103 |
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setambres(ambres); |
104 |
greg |
2.21 |
setambacc(ambacc); |
105 |
greg |
2.19 |
if (afile == NULL) |
106 |
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return; |
107 |
greg |
2.20 |
if (ambacc <= FTINY) { |
108 |
greg |
2.21 |
sprintf(errmsg, "zero ambient accuracy so \"%s\" not opened", |
109 |
greg |
2.20 |
afile); |
110 |
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error(WARNING, errmsg); |
111 |
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return; |
112 |
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} |
113 |
greg |
2.3 |
/* open ambient file */ |
114 |
greg |
2.19 |
if ((ambfp = fopen(afile, "r+")) != NULL) { |
115 |
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initambfile(0); |
116 |
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headlen = ftell(ambfp); |
117 |
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while (readambval(&amb, ambfp)) |
118 |
greg |
2.21 |
avinsert(avstore(&amb)); |
119 |
greg |
2.19 |
/* align */ |
120 |
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fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
121 |
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} else if ((ambfp = fopen(afile, "w+")) != NULL) |
122 |
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initambfile(1); |
123 |
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else { |
124 |
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sprintf(errmsg, "cannot open ambient file \"%s\"", afile); |
125 |
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error(SYSTEM, errmsg); |
126 |
greg |
2.16 |
} |
127 |
greg |
2.19 |
nunflshed++; /* lie */ |
128 |
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ambsync(); |
129 |
greg |
1.8 |
} |
130 |
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131 |
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132 |
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ambnotify(obj) /* record new modifier */ |
133 |
greg |
2.12 |
OBJECT obj; |
134 |
greg |
1.8 |
{ |
135 |
greg |
1.11 |
static int hitlimit = 0; |
136 |
greg |
2.12 |
register OBJREC *o = objptr(obj); |
137 |
greg |
1.8 |
register char **amblp; |
138 |
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|
139 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
140 |
greg |
1.8 |
return; |
141 |
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for (amblp = amblist; *amblp != NULL; amblp++) |
142 |
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if (!strcmp(o->oname, *amblp)) { |
143 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
144 |
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error(WARNING, "too many modifiers in ambient list"); |
145 |
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hitlimit++; |
146 |
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return; /* should this be fatal? */ |
147 |
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} |
148 |
greg |
1.8 |
insertelem(ambset, obj); |
149 |
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return; |
150 |
greg |
1.1 |
} |
151 |
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} |
152 |
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153 |
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154 |
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ambient(acol, r) /* compute ambient component for ray */ |
155 |
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COLOR acol; |
156 |
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register RAY *r; |
157 |
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{ |
158 |
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static int rdepth = 0; /* ambient recursion */ |
159 |
greg |
2.12 |
double d; |
160 |
greg |
1.1 |
|
161 |
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if (ambdiv <= 0) /* no ambient calculation */ |
162 |
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goto dumbamb; |
163 |
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/* check number of bounces */ |
164 |
greg |
1.16 |
if (rdepth >= ambounce) |
165 |
greg |
1.1 |
goto dumbamb; |
166 |
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/* check ambient list */ |
167 |
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if (ambincl != -1 && r->ro != NULL && |
168 |
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ambincl != inset(ambset, r->ro->omod)) |
169 |
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goto dumbamb; |
170 |
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171 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
172 |
greg |
1.16 |
rdepth++; |
173 |
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d = doambient(acol, r, r->rweight, NULL, NULL); |
174 |
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rdepth--; |
175 |
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if (d == 0.0) |
176 |
greg |
1.1 |
goto dumbamb; |
177 |
greg |
1.16 |
return; |
178 |
greg |
1.1 |
} |
179 |
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/* get ambient value */ |
180 |
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setcolor(acol, 0.0, 0.0, 0.0); |
181 |
greg |
1.16 |
d = sumambient(acol, r, rdepth, |
182 |
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&atrunk, thescene.cuorg, thescene.cusize); |
183 |
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if (d > FTINY) |
184 |
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scalecolor(acol, 1.0/d); |
185 |
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else { |
186 |
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d = makeambient(acol, r, rdepth++); |
187 |
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rdepth--; |
188 |
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} |
189 |
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if (d > FTINY) |
190 |
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return; |
191 |
greg |
1.1 |
dumbamb: /* return global value */ |
192 |
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copycolor(acol, ambval); |
193 |
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} |
194 |
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195 |
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196 |
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double |
197 |
greg |
1.16 |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
198 |
greg |
1.1 |
COLOR acol; |
199 |
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register RAY *r; |
200 |
greg |
1.16 |
int al; |
201 |
greg |
2.12 |
AMBTREE *at; |
202 |
greg |
1.1 |
FVECT c0; |
203 |
greg |
2.12 |
double s; |
204 |
greg |
1.1 |
{ |
205 |
greg |
2.12 |
double d, e1, e2, wt, wsum; |
206 |
greg |
1.1 |
COLOR ct; |
207 |
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FVECT ck0; |
208 |
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int i; |
209 |
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register int j; |
210 |
greg |
2.12 |
register AMBVAL *av; |
211 |
greg |
1.7 |
/* do this node */ |
212 |
greg |
1.1 |
wsum = 0.0; |
213 |
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for (av = at->alist; av != NULL; av = av->next) { |
214 |
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/* |
215 |
greg |
1.16 |
* Ambient level test. |
216 |
greg |
1.1 |
*/ |
217 |
greg |
1.16 |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
218 |
greg |
1.1 |
continue; |
219 |
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/* |
220 |
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* Ambient radius test. |
221 |
|
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*/ |
222 |
|
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e1 = 0.0; |
223 |
|
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for (j = 0; j < 3; j++) { |
224 |
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d = av->pos[j] - r->rop[j]; |
225 |
|
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e1 += d * d; |
226 |
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} |
227 |
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e1 /= av->rad * av->rad; |
228 |
|
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if (e1 > ambacc*ambacc*1.21) |
229 |
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continue; |
230 |
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/* |
231 |
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* Normal direction test. |
232 |
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*/ |
233 |
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e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
234 |
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if (e2 < 0.0) e2 = 0.0; |
235 |
|
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if (e1 + e2 > ambacc*ambacc*1.21) |
236 |
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continue; |
237 |
|
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/* |
238 |
|
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* Ray behind test. |
239 |
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*/ |
240 |
|
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d = 0.0; |
241 |
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for (j = 0; j < 3; j++) |
242 |
|
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d += (r->rop[j] - av->pos[j]) * |
243 |
|
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(av->dir[j] + r->ron[j]); |
244 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
245 |
greg |
1.1 |
continue; |
246 |
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/* |
247 |
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* Jittering final test reduces image artifacts. |
248 |
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*/ |
249 |
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wt = sqrt(e1) + sqrt(e2); |
250 |
greg |
2.2 |
wt *= .9 + .2*urand(9015+samplendx); |
251 |
greg |
1.6 |
if (wt > ambacc) |
252 |
greg |
1.1 |
continue; |
253 |
|
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if (wt <= 1e-3) |
254 |
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wt = 1e3; |
255 |
|
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else |
256 |
|
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wt = 1.0 / wt; |
257 |
|
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wsum += wt; |
258 |
greg |
1.15 |
extambient(ct, av, r->rop, r->ron); |
259 |
greg |
1.1 |
scalecolor(ct, wt); |
260 |
|
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addcolor(acol, ct); |
261 |
greg |
1.7 |
} |
262 |
|
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if (at->kid == NULL) |
263 |
|
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return(wsum); |
264 |
|
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/* do children */ |
265 |
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s *= 0.5; |
266 |
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for (i = 0; i < 8; i++) { |
267 |
|
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for (j = 0; j < 3; j++) { |
268 |
|
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ck0[j] = c0[j]; |
269 |
|
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if (1<<j & i) |
270 |
|
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ck0[j] += s; |
271 |
|
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if (r->rop[j] < ck0[j] - OCTSCALE*s) |
272 |
|
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break; |
273 |
|
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if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
274 |
|
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break; |
275 |
|
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} |
276 |
|
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if (j == 3) |
277 |
greg |
1.16 |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
278 |
greg |
1.1 |
} |
279 |
|
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return(wsum); |
280 |
|
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} |
281 |
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282 |
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|
283 |
|
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double |
284 |
greg |
1.16 |
makeambient(acol, r, al) /* make a new ambient value */ |
285 |
greg |
1.1 |
COLOR acol; |
286 |
|
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register RAY *r; |
287 |
greg |
1.16 |
int al; |
288 |
greg |
1.1 |
{ |
289 |
greg |
2.12 |
AMBVAL amb; |
290 |
greg |
1.14 |
FVECT gp, gd; |
291 |
greg |
1.16 |
/* compute weight */ |
292 |
|
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amb.weight = pow(AVGREFL, (double)al); |
293 |
greg |
1.17 |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
294 |
greg |
1.16 |
amb.weight = r->rweight; |
295 |
|
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/* compute ambient */ |
296 |
|
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amb.rad = doambient(acol, r, amb.weight, gp, gd); |
297 |
greg |
1.1 |
if (amb.rad == 0.0) |
298 |
|
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return(0.0); |
299 |
|
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/* store it */ |
300 |
|
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VCOPY(amb.pos, r->rop); |
301 |
|
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VCOPY(amb.dir, r->ron); |
302 |
greg |
1.16 |
amb.lvl = al; |
303 |
greg |
1.1 |
copycolor(amb.val, acol); |
304 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
305 |
|
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VCOPY(amb.gdir, gd); |
306 |
greg |
1.1 |
/* insert into tree */ |
307 |
greg |
2.7 |
avsave(&amb); /* and save to file */ |
308 |
greg |
1.1 |
return(amb.rad); |
309 |
greg |
1.15 |
} |
310 |
|
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|
311 |
|
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|
312 |
|
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extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
313 |
|
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COLOR cr; |
314 |
greg |
2.12 |
register AMBVAL *ap; |
315 |
greg |
1.15 |
FVECT pv, nv; |
316 |
|
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{ |
317 |
|
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FVECT v1, v2; |
318 |
|
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register int i; |
319 |
greg |
2.12 |
double d; |
320 |
greg |
1.15 |
|
321 |
|
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d = 1.0; /* zeroeth order */ |
322 |
|
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/* gradient due to translation */ |
323 |
|
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for (i = 0; i < 3; i++) |
324 |
|
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d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
325 |
|
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/* gradient due to rotation */ |
326 |
|
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VCOPY(v1, ap->dir); |
327 |
|
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fcross(v2, v1, nv); |
328 |
|
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d += DOT(ap->gdir, v2); |
329 |
|
|
if (d <= 0.0) { |
330 |
|
|
setcolor(cr, 0.0, 0.0, 0.0); |
331 |
|
|
return; |
332 |
|
|
} |
333 |
|
|
copycolor(cr, ap->val); |
334 |
|
|
scalecolor(cr, d); |
335 |
greg |
1.1 |
} |
336 |
|
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|
337 |
|
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|
338 |
|
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static |
339 |
greg |
2.9 |
initambfile(creat) /* initialize ambient file */ |
340 |
|
|
int creat; |
341 |
|
|
{ |
342 |
|
|
extern char *progname, *octname, VersionID[]; |
343 |
|
|
|
344 |
greg |
2.19 |
#ifdef F_SETLKW |
345 |
|
|
aflock(creat ? F_WRLCK : F_RDLCK); |
346 |
|
|
#endif |
347 |
greg |
2.12 |
#ifdef MSDOS |
348 |
|
|
setmode(fileno(ambfp), O_BINARY); |
349 |
|
|
#endif |
350 |
greg |
2.21 |
setbuf(ambfp, bmalloc(BUFSIZ+8)); |
351 |
greg |
2.9 |
if (creat) { /* new file */ |
352 |
|
|
fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
353 |
|
|
progname, colval(ambval,RED), |
354 |
|
|
colval(ambval,GRN), colval(ambval,BLU), |
355 |
|
|
ambounce, ambacc); |
356 |
|
|
fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
357 |
|
|
ambdiv, ambssamp, ambres, |
358 |
|
|
octname==NULL ? "" : octname); |
359 |
|
|
fprintf(ambfp, "SOFTWARE= %s\n", VersionID); |
360 |
|
|
fputformat(AMBFMT, ambfp); |
361 |
|
|
putc('\n', ambfp); |
362 |
|
|
putambmagic(ambfp); |
363 |
greg |
2.17 |
} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
364 |
|
|
error(USER, "bad ambient file"); |
365 |
greg |
2.9 |
} |
366 |
|
|
|
367 |
|
|
|
368 |
|
|
static |
369 |
greg |
2.7 |
avsave(av) /* insert and save an ambient value */ |
370 |
greg |
2.12 |
AMBVAL *av; |
371 |
greg |
1.1 |
{ |
372 |
greg |
2.21 |
avinsert(avstore(av)); |
373 |
greg |
1.1 |
if (ambfp == NULL) |
374 |
|
|
return; |
375 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
376 |
greg |
1.1 |
goto writerr; |
377 |
greg |
2.16 |
if (++nunflshed >= AMBFLUSH) |
378 |
greg |
2.7 |
if (ambsync() == EOF) |
379 |
greg |
1.1 |
goto writerr; |
380 |
|
|
return; |
381 |
|
|
writerr: |
382 |
greg |
2.17 |
error(SYSTEM, "error writing ambient file"); |
383 |
greg |
1.1 |
} |
384 |
|
|
|
385 |
|
|
|
386 |
greg |
2.20 |
static AMBVAL * |
387 |
|
|
avstore(aval) /* allocate memory and store aval */ |
388 |
|
|
register AMBVAL *aval; |
389 |
|
|
{ |
390 |
|
|
register AMBVAL *av; |
391 |
|
|
|
392 |
|
|
if ((av = newambval()) == NULL) |
393 |
|
|
error(SYSTEM, "out of memory in avstore"); |
394 |
|
|
copystruct(av, aval); |
395 |
|
|
return(av); |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
|
399 |
greg |
1.1 |
static |
400 |
greg |
2.21 |
avinsert(av) /* insert ambient value in our tree */ |
401 |
greg |
2.20 |
register AMBVAL *av; |
402 |
greg |
1.1 |
{ |
403 |
greg |
2.21 |
register AMBTREE *at; |
404 |
greg |
1.1 |
FVECT ck0; |
405 |
greg |
2.21 |
double s; |
406 |
greg |
1.1 |
int branch; |
407 |
|
|
register int i; |
408 |
|
|
|
409 |
greg |
2.20 |
if (av->rad <= FTINY) |
410 |
|
|
error(CONSISTENCY, "zero ambient radius in avinsert"); |
411 |
greg |
2.21 |
at = &atrunk; |
412 |
|
|
VCOPY(ck0, thescene.cuorg); |
413 |
|
|
s = thescene.cusize; |
414 |
greg |
1.1 |
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
415 |
|
|
if (at->kid == NULL) |
416 |
|
|
if ((at->kid = newambtree()) == NULL) |
417 |
greg |
2.20 |
error(SYSTEM, "out of memory in avinsert"); |
418 |
greg |
1.1 |
s *= 0.5; |
419 |
|
|
branch = 0; |
420 |
|
|
for (i = 0; i < 3; i++) |
421 |
|
|
if (av->pos[i] > ck0[i] + s) { |
422 |
|
|
ck0[i] += s; |
423 |
|
|
branch |= 1 << i; |
424 |
|
|
} |
425 |
|
|
at = at->kid + branch; |
426 |
|
|
} |
427 |
|
|
av->next = at->alist; |
428 |
|
|
at->alist = av; |
429 |
greg |
2.7 |
} |
430 |
|
|
|
431 |
|
|
|
432 |
greg |
2.20 |
static |
433 |
greg |
2.21 |
loadatree(at) /* move tree to main store */ |
434 |
greg |
2.20 |
register AMBTREE *at; |
435 |
|
|
{ |
436 |
|
|
register AMBVAL *av; |
437 |
|
|
register int i; |
438 |
|
|
/* transfer values at this node */ |
439 |
|
|
for (av = at->alist; av != NULL; av = at->alist) { |
440 |
|
|
at->alist = av->next; |
441 |
greg |
2.21 |
avinsert(av); |
442 |
greg |
2.20 |
} |
443 |
greg |
2.21 |
if (at->kid == NULL) |
444 |
|
|
return; |
445 |
greg |
2.20 |
for (i = 0; i < 8; i++) /* transfer and free children */ |
446 |
greg |
2.21 |
loadatree(at->kid+i); |
447 |
greg |
2.20 |
freeambtree(at->kid); |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
|
451 |
greg |
2.18 |
#ifdef F_SETLKW |
452 |
greg |
2.10 |
|
453 |
greg |
2.19 |
static |
454 |
|
|
aflock(typ) /* lock/unlock ambient file */ |
455 |
|
|
int typ; |
456 |
|
|
{ |
457 |
|
|
static struct flock fls; /* static so initialized to zeroes */ |
458 |
|
|
|
459 |
|
|
fls.l_type = typ; |
460 |
|
|
if (fcntl(fileno(ambfp), F_SETLKW, &fls) < 0) |
461 |
|
|
error(SYSTEM, "cannot (un)lock ambient file"); |
462 |
|
|
} |
463 |
|
|
|
464 |
|
|
|
465 |
greg |
2.16 |
int |
466 |
greg |
2.7 |
ambsync() /* synchronize ambient file */ |
467 |
|
|
{ |
468 |
|
|
static FILE *ambinp = NULL; |
469 |
greg |
2.15 |
static long lastpos = -1; |
470 |
|
|
long flen; |
471 |
greg |
2.12 |
AMBVAL avs; |
472 |
greg |
2.7 |
register int n; |
473 |
greg |
2.16 |
|
474 |
|
|
if (nunflshed == 0) |
475 |
|
|
return(0); |
476 |
greg |
2.19 |
if (lastpos < 0) /* initializing (locked in initambfile) */ |
477 |
|
|
goto syncend; |
478 |
greg |
2.7 |
/* gain exclusive access */ |
479 |
greg |
2.19 |
aflock(F_WRLCK); |
480 |
greg |
2.7 |
/* see if file has grown */ |
481 |
greg |
2.15 |
if ((flen = lseek(fileno(ambfp), 0L, 2)) < 0) |
482 |
greg |
2.21 |
goto seekerr; |
483 |
greg |
2.15 |
if (n = flen - lastpos) { /* file has grown */ |
484 |
greg |
2.17 |
if (ambinp == NULL) { /* use duplicate filedes */ |
485 |
|
|
ambinp = fdopen(dup(fileno(ambfp)), "r"); |
486 |
greg |
2.14 |
if (ambinp == NULL) |
487 |
greg |
2.17 |
error(SYSTEM, "fdopen failed in ambsync"); |
488 |
greg |
2.14 |
} |
489 |
greg |
2.15 |
if (fseek(ambinp, lastpos, 0) < 0) |
490 |
greg |
2.21 |
goto seekerr; |
491 |
greg |
2.15 |
while (n >= AMBVALSIZ) { /* load contributed values */ |
492 |
greg |
2.7 |
readambval(&avs, ambinp); |
493 |
greg |
2.21 |
avinsert(avstore(&avs)); |
494 |
greg |
2.15 |
n -= AMBVALSIZ; |
495 |
|
|
} |
496 |
greg |
2.22 |
/*** seek always as safety measure |
497 |
|
|
if (n) ***/ /* alignment */ |
498 |
greg |
2.21 |
if (lseek(fileno(ambfp), flen-n, 0) < 0) |
499 |
|
|
goto seekerr; |
500 |
greg |
2.7 |
} |
501 |
greg |
2.21 |
#ifdef DEBUG |
502 |
|
|
if (ambfp->_ptr - ambfp->_base != nunflshed*AMBVALSIZ) { |
503 |
|
|
sprintf(errmsg, "ambient file buffer at %d rather than %d", |
504 |
|
|
ambfp->_ptr - ambfp->_base, |
505 |
|
|
nunflshed*AMBVALSIZ); |
506 |
|
|
error(CONSISTENCY, errmsg); |
507 |
|
|
} |
508 |
|
|
#endif |
509 |
greg |
2.15 |
syncend: |
510 |
greg |
2.7 |
n = fflush(ambfp); /* calls write() at last */ |
511 |
greg |
2.21 |
if ((lastpos = lseek(fileno(ambfp), 0L, 1)) < 0) |
512 |
|
|
goto seekerr; |
513 |
greg |
2.19 |
aflock(F_UNLCK); /* release file */ |
514 |
greg |
2.16 |
nunflshed = 0; |
515 |
greg |
2.7 |
return(n); |
516 |
greg |
2.21 |
seekerr: |
517 |
|
|
error(SYSTEM, "seek failed in ambsync"); |
518 |
greg |
2.18 |
} |
519 |
|
|
|
520 |
|
|
#else |
521 |
|
|
|
522 |
|
|
int |
523 |
|
|
ambsync() /* flush ambient file */ |
524 |
|
|
{ |
525 |
|
|
if (nunflshed == 0) |
526 |
|
|
return(0); |
527 |
|
|
nunflshed = 0; |
528 |
|
|
return(fflush(ambfp)); |
529 |
greg |
1.1 |
} |
530 |
greg |
2.10 |
|
531 |
|
|
#endif |