1 |
greg |
1.14 |
/* Copyright (c) 1991 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"; |
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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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* The macro AMBFLUSH (if defined) is the number of ambient values |
11 |
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* to wait before flushing to the ambient file. |
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* |
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* 5/9/86 |
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*/ |
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16 |
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#include "ray.h" |
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18 |
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#include "octree.h" |
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20 |
greg |
1.8 |
#include "otypes.h" |
21 |
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22 |
greg |
1.14 |
#include "ambient.h" |
23 |
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24 |
greg |
1.1 |
#include "random.h" |
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26 |
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#define OCTSCALE 0.5 /* ceil((valid rad.)/(cube size)) */ |
27 |
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28 |
greg |
1.14 |
typedef struct ambtree { |
29 |
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AMBVAL *alist; /* ambient value list */ |
30 |
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struct ambtree *kid; /* 8 child nodes */ |
31 |
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} AMBTREE; /* ambient octree */ |
32 |
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33 |
greg |
1.1 |
extern CUBE thescene; /* contains space boundaries */ |
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35 |
greg |
1.11 |
#define MAXASET 511 /* maximum number of elements in ambient set */ |
36 |
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OBJECT ambset[MAXASET+1]={0}; /* ambient include/exclude set */ |
37 |
greg |
1.1 |
|
38 |
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double maxarad; /* maximum ambient radius */ |
39 |
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double minarad; /* minimum ambient radius */ |
40 |
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41 |
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static AMBTREE atrunk; /* our ambient trunk node */ |
42 |
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43 |
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static FILE *ambfp = NULL; /* ambient file pointer */ |
44 |
greg |
2.6 |
static int ambheadlen; /* length of ambient file header */ |
45 |
greg |
1.1 |
|
46 |
greg |
2.6 |
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
47 |
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48 |
greg |
1.1 |
#define newambval() (AMBVAL *)bmalloc(sizeof(AMBVAL)) |
49 |
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50 |
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#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
51 |
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52 |
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53 |
greg |
2.3 |
setambres(ar) /* set ambient resolution */ |
54 |
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int ar; |
55 |
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{ |
56 |
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/* set min & max radii */ |
57 |
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if (ar <= 0) { |
58 |
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minarad = 0.0; |
59 |
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maxarad = thescene.cusize / 2.0; |
60 |
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} else { |
61 |
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minarad = thescene.cusize / ar; |
62 |
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maxarad = 16.0 * minarad; /* heuristic */ |
63 |
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if (maxarad > thescene.cusize / 2.0) |
64 |
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maxarad = thescene.cusize / 2.0; |
65 |
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} |
66 |
greg |
2.4 |
if (maxarad <= FTINY) |
67 |
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maxarad = .001; |
68 |
greg |
2.3 |
} |
69 |
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70 |
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71 |
greg |
1.1 |
setambient(afile) /* initialize calculation */ |
72 |
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char *afile; |
73 |
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{ |
74 |
greg |
2.6 |
extern long ftell(); |
75 |
greg |
1.1 |
AMBVAL amb; |
76 |
greg |
2.3 |
/* init ambient limits */ |
77 |
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setambres(ambres); |
78 |
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/* open ambient file */ |
79 |
greg |
1.1 |
if (afile != NULL) |
80 |
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if ((ambfp = fopen(afile, "r+")) != NULL) { |
81 |
greg |
2.6 |
initambfile(0); |
82 |
greg |
2.5 |
while (readambval(&amb, ambfp)) |
83 |
greg |
1.1 |
avinsert(&amb, &atrunk, thescene.cuorg, |
84 |
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thescene.cusize); |
85 |
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/* align */ |
86 |
greg |
2.6 |
fseek(ambfp, -((ftell(ambfp)-ambheadlen)%AMBVALSIZ), 1); |
87 |
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} else if ((ambfp = fopen(afile, "w")) != NULL) |
88 |
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initambfile(1); |
89 |
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else { |
90 |
greg |
1.1 |
sprintf(errmsg, "cannot open ambient file \"%s\"", |
91 |
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afile); |
92 |
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error(SYSTEM, errmsg); |
93 |
greg |
1.8 |
} |
94 |
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} |
95 |
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96 |
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97 |
greg |
2.6 |
initambfile(creat) /* initialize ambient file */ |
98 |
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int creat; |
99 |
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{ |
100 |
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extern char *progname, *octname; |
101 |
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102 |
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setbuf(ambfp, bmalloc(BUFSIZ)); |
103 |
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if (creat) { /* new file */ |
104 |
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fprintf(ambfp, "%s -av %g %g %g -ab %d -aa %g ", |
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progname, colval(ambval,RED), |
106 |
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colval(ambval,GRN), colval(ambval,BLU), |
107 |
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ambounce, ambacc); |
108 |
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fprintf(ambfp, "-ad %d -as %d -ar %d %s\n", |
109 |
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ambdiv, ambssamp, ambres, |
110 |
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octname==NULL ? "" : octname); |
111 |
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fputformat(AMBFMT, ambfp); |
112 |
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putc('\n', ambfp); |
113 |
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putambmagic(ambfp); |
114 |
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fflush(ambfp); |
115 |
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} else if (checkheader(ambfp, AMBFMT, NULL) < 0 || !hasambmagic(ambfp)) |
116 |
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error(USER, "ambient file format error"); |
117 |
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ambheadlen = ftell(ambfp); |
118 |
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} |
119 |
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120 |
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121 |
greg |
1.8 |
ambnotify(obj) /* record new modifier */ |
122 |
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OBJECT obj; |
123 |
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{ |
124 |
greg |
1.11 |
static int hitlimit = 0; |
125 |
greg |
1.8 |
register OBJREC *o = objptr(obj); |
126 |
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register char **amblp; |
127 |
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128 |
greg |
1.11 |
if (hitlimit || !ismodifier(o->otype)) |
129 |
greg |
1.8 |
return; |
130 |
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for (amblp = amblist; *amblp != NULL; amblp++) |
131 |
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if (!strcmp(o->oname, *amblp)) { |
132 |
greg |
1.11 |
if (ambset[0] >= MAXASET) { |
133 |
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error(WARNING, "too many modifiers in ambient list"); |
134 |
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hitlimit++; |
135 |
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return; /* should this be fatal? */ |
136 |
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} |
137 |
greg |
1.8 |
insertelem(ambset, obj); |
138 |
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return; |
139 |
greg |
1.1 |
} |
140 |
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} |
141 |
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142 |
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143 |
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ambient(acol, r) /* compute ambient component for ray */ |
144 |
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COLOR acol; |
145 |
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register RAY *r; |
146 |
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{ |
147 |
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static int rdepth = 0; /* ambient recursion */ |
148 |
greg |
1.16 |
double d; |
149 |
greg |
1.1 |
|
150 |
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if (ambdiv <= 0) /* no ambient calculation */ |
151 |
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goto dumbamb; |
152 |
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/* check number of bounces */ |
153 |
greg |
1.16 |
if (rdepth >= ambounce) |
154 |
greg |
1.1 |
goto dumbamb; |
155 |
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/* check ambient list */ |
156 |
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if (ambincl != -1 && r->ro != NULL && |
157 |
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ambincl != inset(ambset, r->ro->omod)) |
158 |
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goto dumbamb; |
159 |
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160 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
161 |
greg |
1.16 |
rdepth++; |
162 |
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d = doambient(acol, r, r->rweight, NULL, NULL); |
163 |
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rdepth--; |
164 |
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if (d == 0.0) |
165 |
greg |
1.1 |
goto dumbamb; |
166 |
greg |
1.16 |
return; |
167 |
greg |
1.1 |
} |
168 |
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/* get ambient value */ |
169 |
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setcolor(acol, 0.0, 0.0, 0.0); |
170 |
greg |
1.16 |
d = sumambient(acol, r, rdepth, |
171 |
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&atrunk, thescene.cuorg, thescene.cusize); |
172 |
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if (d > FTINY) |
173 |
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scalecolor(acol, 1.0/d); |
174 |
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else { |
175 |
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d = makeambient(acol, r, rdepth++); |
176 |
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rdepth--; |
177 |
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} |
178 |
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if (d > FTINY) |
179 |
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return; |
180 |
greg |
1.1 |
dumbamb: /* return global value */ |
181 |
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copycolor(acol, ambval); |
182 |
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} |
183 |
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184 |
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185 |
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double |
186 |
greg |
1.16 |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
187 |
greg |
1.1 |
COLOR acol; |
188 |
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register RAY *r; |
189 |
greg |
1.16 |
int al; |
190 |
greg |
1.1 |
AMBTREE *at; |
191 |
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FVECT c0; |
192 |
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double s; |
193 |
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{ |
194 |
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extern double sqrt(); |
195 |
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double d, e1, e2, wt, wsum; |
196 |
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COLOR ct; |
197 |
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FVECT ck0; |
198 |
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int i; |
199 |
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register int j; |
200 |
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register AMBVAL *av; |
201 |
greg |
1.7 |
/* do this node */ |
202 |
greg |
1.1 |
wsum = 0.0; |
203 |
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for (av = at->alist; av != NULL; av = av->next) { |
204 |
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/* |
205 |
greg |
1.16 |
* Ambient level test. |
206 |
greg |
1.1 |
*/ |
207 |
greg |
1.16 |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
208 |
greg |
1.1 |
continue; |
209 |
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/* |
210 |
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* Ambient radius test. |
211 |
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*/ |
212 |
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e1 = 0.0; |
213 |
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for (j = 0; j < 3; j++) { |
214 |
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d = av->pos[j] - r->rop[j]; |
215 |
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e1 += d * d; |
216 |
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} |
217 |
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e1 /= av->rad * av->rad; |
218 |
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if (e1 > ambacc*ambacc*1.21) |
219 |
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continue; |
220 |
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/* |
221 |
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* Normal direction test. |
222 |
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*/ |
223 |
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e2 = (1.0 - DOT(av->dir, r->ron)) * r->rweight; |
224 |
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if (e2 < 0.0) e2 = 0.0; |
225 |
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if (e1 + e2 > ambacc*ambacc*1.21) |
226 |
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continue; |
227 |
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/* |
228 |
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* Ray behind test. |
229 |
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*/ |
230 |
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d = 0.0; |
231 |
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for (j = 0; j < 3; j++) |
232 |
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d += (r->rop[j] - av->pos[j]) * |
233 |
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(av->dir[j] + r->ron[j]); |
234 |
greg |
1.18 |
if (d*0.5 < -minarad*ambacc-.001) |
235 |
greg |
1.1 |
continue; |
236 |
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/* |
237 |
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* Jittering final test reduces image artifacts. |
238 |
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*/ |
239 |
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wt = sqrt(e1) + sqrt(e2); |
240 |
greg |
2.2 |
wt *= .9 + .2*urand(9015+samplendx); |
241 |
greg |
1.6 |
if (wt > ambacc) |
242 |
greg |
1.1 |
continue; |
243 |
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if (wt <= 1e-3) |
244 |
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wt = 1e3; |
245 |
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else |
246 |
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wt = 1.0 / wt; |
247 |
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wsum += wt; |
248 |
greg |
1.15 |
extambient(ct, av, r->rop, r->ron); |
249 |
greg |
1.1 |
scalecolor(ct, wt); |
250 |
|
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addcolor(acol, ct); |
251 |
greg |
1.7 |
} |
252 |
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if (at->kid == NULL) |
253 |
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return(wsum); |
254 |
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/* do children */ |
255 |
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s *= 0.5; |
256 |
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for (i = 0; i < 8; i++) { |
257 |
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for (j = 0; j < 3; j++) { |
258 |
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ck0[j] = c0[j]; |
259 |
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if (1<<j & i) |
260 |
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ck0[j] += s; |
261 |
|
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if (r->rop[j] < ck0[j] - OCTSCALE*s) |
262 |
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break; |
263 |
|
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if (r->rop[j] > ck0[j] + (1.0+OCTSCALE)*s) |
264 |
|
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break; |
265 |
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} |
266 |
|
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if (j == 3) |
267 |
greg |
1.16 |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
268 |
greg |
1.1 |
} |
269 |
|
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return(wsum); |
270 |
|
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} |
271 |
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272 |
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273 |
|
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double |
274 |
greg |
1.16 |
makeambient(acol, r, al) /* make a new ambient value */ |
275 |
greg |
1.1 |
COLOR acol; |
276 |
|
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register RAY *r; |
277 |
greg |
1.16 |
int al; |
278 |
greg |
1.1 |
{ |
279 |
|
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AMBVAL amb; |
280 |
greg |
1.14 |
FVECT gp, gd; |
281 |
greg |
1.16 |
/* compute weight */ |
282 |
|
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amb.weight = pow(AVGREFL, (double)al); |
283 |
greg |
1.17 |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
284 |
greg |
1.16 |
amb.weight = r->rweight; |
285 |
|
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/* compute ambient */ |
286 |
|
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amb.rad = doambient(acol, r, amb.weight, gp, gd); |
287 |
greg |
1.1 |
if (amb.rad == 0.0) |
288 |
|
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return(0.0); |
289 |
|
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/* store it */ |
290 |
|
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VCOPY(amb.pos, r->rop); |
291 |
|
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VCOPY(amb.dir, r->ron); |
292 |
greg |
1.16 |
amb.lvl = al; |
293 |
greg |
1.1 |
copycolor(amb.val, acol); |
294 |
greg |
1.14 |
VCOPY(amb.gpos, gp); |
295 |
|
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VCOPY(amb.gdir, gd); |
296 |
greg |
1.1 |
/* insert into tree */ |
297 |
|
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avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
298 |
|
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avsave(&amb); /* write to file */ |
299 |
|
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return(amb.rad); |
300 |
greg |
1.15 |
} |
301 |
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302 |
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|
303 |
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extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
304 |
|
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COLOR cr; |
305 |
|
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register AMBVAL *ap; |
306 |
|
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FVECT pv, nv; |
307 |
|
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{ |
308 |
|
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FVECT v1, v2; |
309 |
|
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register int i; |
310 |
|
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double d; |
311 |
|
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|
312 |
|
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d = 1.0; /* zeroeth order */ |
313 |
|
|
/* gradient due to translation */ |
314 |
|
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for (i = 0; i < 3; i++) |
315 |
|
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d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
316 |
|
|
/* gradient due to rotation */ |
317 |
|
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VCOPY(v1, ap->dir); |
318 |
|
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fcross(v2, v1, nv); |
319 |
|
|
d += DOT(ap->gdir, v2); |
320 |
|
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if (d <= 0.0) { |
321 |
|
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setcolor(cr, 0.0, 0.0, 0.0); |
322 |
|
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return; |
323 |
|
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} |
324 |
|
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copycolor(cr, ap->val); |
325 |
|
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scalecolor(cr, d); |
326 |
greg |
1.1 |
} |
327 |
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|
328 |
|
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|
329 |
|
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static |
330 |
|
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avsave(av) /* save an ambient value */ |
331 |
|
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AMBVAL *av; |
332 |
|
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{ |
333 |
|
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static int nunflshed = 0; |
334 |
greg |
2.6 |
|
335 |
greg |
1.1 |
if (ambfp == NULL) |
336 |
|
|
return; |
337 |
greg |
2.5 |
if (writambval(av, ambfp) < 0) |
338 |
greg |
1.1 |
goto writerr; |
339 |
|
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if (++nunflshed >= AMBFLUSH) { |
340 |
|
|
if (fflush(ambfp) == EOF) |
341 |
|
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goto writerr; |
342 |
|
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nunflshed = 0; |
343 |
|
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} |
344 |
|
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return; |
345 |
|
|
writerr: |
346 |
|
|
error(SYSTEM, "error writing ambient file"); |
347 |
|
|
} |
348 |
|
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|
349 |
|
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|
350 |
|
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static |
351 |
|
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avinsert(aval, at, c0, s) /* insert ambient value in a tree */ |
352 |
|
|
AMBVAL *aval; |
353 |
|
|
register AMBTREE *at; |
354 |
|
|
FVECT c0; |
355 |
|
|
double s; |
356 |
|
|
{ |
357 |
|
|
FVECT ck0; |
358 |
|
|
int branch; |
359 |
|
|
register AMBVAL *av; |
360 |
|
|
register int i; |
361 |
|
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|
362 |
|
|
if ((av = newambval()) == NULL) |
363 |
|
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goto memerr; |
364 |
greg |
1.9 |
copystruct(av, aval); |
365 |
greg |
1.1 |
VCOPY(ck0, c0); |
366 |
|
|
while (s*(OCTSCALE/2) > av->rad*ambacc) { |
367 |
|
|
if (at->kid == NULL) |
368 |
|
|
if ((at->kid = newambtree()) == NULL) |
369 |
|
|
goto memerr; |
370 |
|
|
s *= 0.5; |
371 |
|
|
branch = 0; |
372 |
|
|
for (i = 0; i < 3; i++) |
373 |
|
|
if (av->pos[i] > ck0[i] + s) { |
374 |
|
|
ck0[i] += s; |
375 |
|
|
branch |= 1 << i; |
376 |
|
|
} |
377 |
|
|
at = at->kid + branch; |
378 |
|
|
} |
379 |
|
|
av->next = at->alist; |
380 |
|
|
at->alist = av; |
381 |
|
|
return; |
382 |
|
|
memerr: |
383 |
|
|
error(SYSTEM, "out of memory in avinsert"); |
384 |
|
|
} |