1 |
gregl |
3.1 |
#ifndef lint |
2 |
greg |
3.13 |
static const char RCSid[] = "$Id: vwrays.c,v 3.12 2005/09/19 04:26:09 greg Exp $"; |
3 |
gregl |
3.1 |
#endif |
4 |
|
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/* |
5 |
|
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* Compute rays corresponding to a given picture or view. |
6 |
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*/ |
7 |
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8 |
greg |
3.9 |
#include "platform.h" |
9 |
gregl |
3.1 |
#include "standard.h" |
10 |
greg |
3.12 |
#include "random.h" |
11 |
gregl |
3.1 |
#include "view.h" |
12 |
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|
13 |
schorsch |
3.10 |
typedef void putfunc(FVECT ro, FVECT rd); |
14 |
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static putfunc puta; |
15 |
|
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static putfunc putf; |
16 |
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static putfunc putd; |
17 |
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static void pix2rays(FILE *fp); |
18 |
|
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static void putrays(void); |
19 |
gregl |
3.1 |
|
20 |
schorsch |
3.10 |
static putfunc *putr = puta; |
21 |
gregl |
3.1 |
|
22 |
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VIEW vw = STDVIEW; |
23 |
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24 |
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RESOLU rs = {PIXSTANDARD, 512, 512}; |
25 |
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26 |
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double pa = 1.; |
27 |
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28 |
greg |
3.12 |
double pj = 0.; |
29 |
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|
30 |
gregl |
3.1 |
int zfd = -1; |
31 |
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|
32 |
greg |
3.4 |
int fromstdin = 0; |
33 |
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|
34 |
gregl |
3.1 |
char *progname; |
35 |
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36 |
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37 |
schorsch |
3.10 |
int |
38 |
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main( |
39 |
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int argc, |
40 |
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char *argv[] |
41 |
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) |
42 |
gregl |
3.1 |
{ |
43 |
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char *err; |
44 |
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int rval, getdim = 0; |
45 |
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register int i; |
46 |
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47 |
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progname = argv[0]; |
48 |
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if (argc < 2) |
49 |
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goto userr; |
50 |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
51 |
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switch (argv[i][1]) { |
52 |
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case 'f': /* output format */ |
53 |
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switch (argv[i][2]) { |
54 |
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case 'a': /* ASCII */ |
55 |
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putr = puta; |
56 |
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break; |
57 |
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case 'f': /* float */ |
58 |
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putr = putf; |
59 |
greg |
3.13 |
SET_FILE_BINARY(stdout); |
60 |
gregl |
3.1 |
break; |
61 |
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case 'd': /* double */ |
62 |
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putr = putd; |
63 |
greg |
3.13 |
SET_FILE_BINARY(stdout); |
64 |
gregl |
3.1 |
break; |
65 |
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default: |
66 |
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goto userr; |
67 |
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} |
68 |
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break; |
69 |
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case 'v': /* view file or option */ |
70 |
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if (argv[i][2] == 'f') { |
71 |
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rval = viewfile(argv[++i], &vw, NULL); |
72 |
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if (rval <= 0) { |
73 |
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fprintf(stderr, |
74 |
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"%s: no view in file\n", |
75 |
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argv[i]); |
76 |
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exit(1); |
77 |
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} |
78 |
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break; |
79 |
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} |
80 |
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rval = getviewopt(&vw, argc-i, argv+i); |
81 |
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if (rval < 0) |
82 |
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goto userr; |
83 |
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i += rval; |
84 |
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break; |
85 |
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case 'd': /* report dimensions only */ |
86 |
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getdim++; |
87 |
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break; |
88 |
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case 'x': /* x resolution */ |
89 |
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rs.xr = atoi(argv[++i]); |
90 |
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if (rs.xr <= 0) { |
91 |
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fprintf(stderr, "%s: bad x resolution\n", |
92 |
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progname); |
93 |
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exit(1); |
94 |
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} |
95 |
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break; |
96 |
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case 'y': /* y resolution */ |
97 |
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rs.yr = atoi(argv[++i]); |
98 |
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if (rs.yr <= 0) { |
99 |
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fprintf(stderr, "%s: bad y resolution\n", |
100 |
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progname); |
101 |
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exit(1); |
102 |
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} |
103 |
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break; |
104 |
greg |
3.12 |
case 'p': /* pixel aspect or jitter */ |
105 |
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if (argv[i][2] == 'a') |
106 |
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pa = atof(argv[++i]); |
107 |
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else if (argv[i][2] == 'j') |
108 |
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pj= atof(argv[++i]); |
109 |
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else |
110 |
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goto userr; |
111 |
gregl |
3.1 |
break; |
112 |
greg |
3.4 |
case 'i': /* get pixels from stdin */ |
113 |
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fromstdin = 1; |
114 |
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break; |
115 |
gregl |
3.1 |
default: |
116 |
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goto userr; |
117 |
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} |
118 |
schorsch |
3.7 |
if ((i > argc) | (i+2 < argc)) |
119 |
gregl |
3.1 |
goto userr; |
120 |
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if (i < argc) { |
121 |
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rval = viewfile(argv[i], &vw, &rs); |
122 |
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if (rval <= 0) { |
123 |
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fprintf(stderr, "%s: no view in picture\n", argv[i]); |
124 |
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exit(1); |
125 |
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} |
126 |
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if (i+1 < argc) { |
127 |
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zfd = open(argv[i+1], O_RDONLY); |
128 |
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if (zfd < 0) { |
129 |
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fprintf(stderr, |
130 |
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"%s: cannot open depth buffer\n", |
131 |
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argv[i+1]); |
132 |
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exit(1); |
133 |
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} |
134 |
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} |
135 |
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} |
136 |
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if ((err = setview(&vw)) != NULL) { |
137 |
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fprintf(stderr, "%s: %s\n", progname, err); |
138 |
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exit(1); |
139 |
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} |
140 |
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if (i == argc) |
141 |
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normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr); |
142 |
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if (getdim) { |
143 |
gregl |
3.3 |
printf("-x %d -y %d -ld%c\n", rs.xr, rs.yr, |
144 |
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vw.vaft > FTINY ? '+' : '-'); |
145 |
gregl |
3.1 |
exit(0); |
146 |
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} |
147 |
greg |
3.4 |
if (fromstdin) |
148 |
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pix2rays(stdin); |
149 |
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else |
150 |
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putrays(); |
151 |
gregl |
3.1 |
exit(0); |
152 |
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userr: |
153 |
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fprintf(stderr, |
154 |
greg |
3.4 |
"Usage: %s [ -i -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n", |
155 |
gregl |
3.1 |
progname); |
156 |
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exit(1); |
157 |
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} |
158 |
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159 |
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160 |
schorsch |
3.10 |
static void |
161 |
greg |
3.12 |
jitterloc( |
162 |
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RREAL loc[2] |
163 |
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) |
164 |
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{ |
165 |
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if (pj > FTINY) { |
166 |
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loc[0] += pj*(.5 - frandom())/rs.xr; |
167 |
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loc[1] += pj*(.5 - frandom())/rs.yr; |
168 |
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} |
169 |
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} |
170 |
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171 |
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172 |
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static void |
173 |
schorsch |
3.10 |
pix2rays( |
174 |
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FILE *fp |
175 |
|
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) |
176 |
greg |
3.4 |
{ |
177 |
|
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static FVECT rorg, rdir; |
178 |
|
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float zval; |
179 |
|
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double px, py; |
180 |
greg |
3.12 |
RREAL loc[2]; |
181 |
greg |
3.4 |
int pp[2]; |
182 |
|
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double d; |
183 |
|
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register int i; |
184 |
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185 |
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while (fscanf(fp, "%lf %lf", &px, &py) == 2) { |
186 |
greg |
3.11 |
px += .5; py += .5; |
187 |
greg |
3.4 |
if (px < 0 || px >= rs.xr || |
188 |
|
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py < 0 || py >= rs.yr) { |
189 |
|
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fprintf(stderr, |
190 |
|
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"%s: (x,y) pair (%.0f,%.0f) out of range\n", |
191 |
|
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progname, px, py); |
192 |
|
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exit(1); |
193 |
|
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} |
194 |
greg |
3.12 |
loc[0] = px/rs.xr; loc[1] = py/rs.yr; |
195 |
greg |
3.4 |
if (zfd >= 0) { |
196 |
greg |
3.12 |
loc2pix(pp, &rs, loc[0], loc[1]); |
197 |
greg |
3.4 |
if (lseek(zfd, |
198 |
greg |
3.8 |
(pp[1]*scanlen(&rs)+pp[0])*sizeof(float), |
199 |
|
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SEEK_SET) < 0 || |
200 |
greg |
3.4 |
read(zfd, &zval, sizeof(float)) |
201 |
greg |
3.8 |
< sizeof(float)) { |
202 |
greg |
3.4 |
fprintf(stderr, "%s: depth buffer read error\n", |
203 |
|
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progname); |
204 |
|
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exit(1); |
205 |
|
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} |
206 |
|
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} |
207 |
greg |
3.12 |
jitterloc(loc); |
208 |
|
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d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
209 |
greg |
3.4 |
if (d < -FTINY) |
210 |
|
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rorg[0] = rorg[1] = rorg[2] = |
211 |
|
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rdir[0] = rdir[1] = rdir[2] = 0.; |
212 |
|
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else if (zfd >= 0) |
213 |
|
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for (i = 0; i < 3; i++) { |
214 |
|
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rorg[i] += rdir[i]*zval; |
215 |
|
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rdir[i] = -rdir[i]; |
216 |
|
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} |
217 |
|
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else if (d > FTINY) { |
218 |
|
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
219 |
|
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} |
220 |
|
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(*putr)(rorg, rdir); |
221 |
|
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} |
222 |
|
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if (!feof(fp)) { |
223 |
|
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fprintf(stderr, "%s: expected px py on input\n", progname); |
224 |
|
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exit(1); |
225 |
|
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} |
226 |
|
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} |
227 |
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|
228 |
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|
229 |
schorsch |
3.10 |
static void |
230 |
|
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putrays(void) |
231 |
gregl |
3.1 |
{ |
232 |
greg |
3.12 |
RREAL loc[2]; |
233 |
|
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FVECT rorg, rdir; |
234 |
schorsch |
3.10 |
float *zbuf = NULL; |
235 |
gregl |
3.1 |
int sc; |
236 |
gregl |
3.2 |
double d; |
237 |
gregl |
3.1 |
register int si, i; |
238 |
|
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|
239 |
|
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if (zfd >= 0) { |
240 |
|
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zbuf = (float *)malloc(scanlen(&rs)*sizeof(float)); |
241 |
|
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if (zbuf == NULL) { |
242 |
|
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fprintf(stderr, "%s: not enough memory\n", progname); |
243 |
|
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exit(1); |
244 |
|
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} |
245 |
|
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} |
246 |
|
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for (sc = 0; sc < numscans(&rs); sc++) { |
247 |
|
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if (zfd >= 0) { |
248 |
|
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if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) < |
249 |
|
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scanlen(&rs)*sizeof(float)) { |
250 |
|
|
fprintf(stderr, "%s: depth buffer read error\n", |
251 |
|
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progname); |
252 |
|
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exit(1); |
253 |
|
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} |
254 |
|
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} |
255 |
|
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for (si = 0; si < scanlen(&rs); si++) { |
256 |
|
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pix2loc(loc, &rs, si, sc); |
257 |
greg |
3.12 |
jitterloc(loc); |
258 |
gregl |
3.2 |
d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
259 |
|
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if (d < -FTINY) |
260 |
gregl |
3.1 |
rorg[0] = rorg[1] = rorg[2] = |
261 |
|
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rdir[0] = rdir[1] = rdir[2] = 0.; |
262 |
|
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else if (zfd >= 0) |
263 |
|
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for (i = 0; i < 3; i++) { |
264 |
|
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rorg[i] += rdir[i]*zbuf[si]; |
265 |
|
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rdir[i] = -rdir[i]; |
266 |
|
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} |
267 |
gregl |
3.2 |
else if (d > FTINY) { |
268 |
|
|
rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
269 |
|
|
} |
270 |
gregl |
3.1 |
(*putr)(rorg, rdir); |
271 |
|
|
} |
272 |
|
|
} |
273 |
|
|
if (zfd >= 0) |
274 |
greg |
3.4 |
free((void *)zbuf); |
275 |
gregl |
3.1 |
} |
276 |
|
|
|
277 |
|
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|
278 |
schorsch |
3.10 |
static void |
279 |
|
|
puta( /* put out ray in ASCII format */ |
280 |
|
|
FVECT ro, |
281 |
|
|
FVECT rd |
282 |
|
|
) |
283 |
gregl |
3.1 |
{ |
284 |
|
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printf("%.5e %.5e %.5e %.5e %.5e %.5e\n", |
285 |
|
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ro[0], ro[1], ro[2], |
286 |
|
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rd[0], rd[1], rd[2]); |
287 |
|
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} |
288 |
|
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|
289 |
|
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|
290 |
schorsch |
3.10 |
static void |
291 |
|
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putf( /* put out ray in float format */ |
292 |
|
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FVECT ro, |
293 |
|
|
FVECT rd |
294 |
|
|
) |
295 |
gregl |
3.1 |
{ |
296 |
|
|
float v[6]; |
297 |
|
|
|
298 |
|
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v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
299 |
|
|
v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
300 |
|
|
fwrite(v, sizeof(float), 6, stdout); |
301 |
|
|
} |
302 |
|
|
|
303 |
|
|
|
304 |
schorsch |
3.10 |
static void |
305 |
|
|
putd( /* put out ray in double format */ |
306 |
|
|
FVECT ro, |
307 |
|
|
FVECT rd |
308 |
|
|
) |
309 |
gregl |
3.1 |
{ |
310 |
|
|
double v[6]; |
311 |
|
|
|
312 |
|
|
v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
313 |
|
|
v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
314 |
|
|
fwrite(v, sizeof(double), 6, stdout); |
315 |
|
|
} |