1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.12 |
static const char RCSid[] = "$Id: rsensor.c,v 2.11 2011/06/20 23:08:43 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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5 |
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/* |
6 |
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* Compute sensor signal based on spatial sensitivity. |
7 |
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* |
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* Created Feb 2008 for Architectural Energy Corp. |
9 |
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*/ |
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#include "ray.h" |
12 |
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#include "source.h" |
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#include "view.h" |
14 |
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#include "random.h" |
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16 |
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#define DEGREE (PI/180.) |
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18 |
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#define MAXNT 180 /* maximum number of theta divisions */ |
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#define MAXNP 360 /* maximum number of phi divisions */ |
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21 |
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extern char *progname; /* global argv[0] */ |
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extern int nowarn; /* don't report warnings? */ |
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24 |
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/* current sensor's perspective */ |
25 |
greg |
2.5 |
VIEW ourview = {VT_ANG,{0.,0.,0.},{0.,0.,1.},{1.,0.,0.}, |
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1.,180.,180.,0.,0.,0.,0., |
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{0.,0.,0.},{0.,0.,0.},0.,0.}; |
28 |
greg |
2.1 |
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29 |
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unsigned long nsamps = 10000; /* desired number of initial samples */ |
30 |
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unsigned long nssamps = 9000; /* number of super-samples */ |
31 |
greg |
2.2 |
int ndsamps = 32; /* number of direct samples */ |
32 |
greg |
2.1 |
int nprocs = 1; /* number of rendering processes */ |
33 |
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34 |
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float *sensor = NULL; /* current sensor data */ |
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int sntp[2]; /* number of sensor theta and phi angles */ |
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float maxtheta; /* maximum theta value for this sensor */ |
37 |
greg |
2.9 |
float tvals[MAXNT+1]; /* theta prob. values (1-D table of 1-cos(t)) */ |
38 |
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float *pvals = NULL; /* phi prob. values (2-D table in radians) */ |
39 |
greg |
2.1 |
int ntheta = 0; /* polar angle divisions */ |
40 |
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int nphi = 0; /* azimuthal angle divisions */ |
41 |
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double gscale = 1.; /* global scaling value */ |
42 |
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43 |
greg |
2.2 |
#define s_theta(t) sensor[(t+1)*(sntp[1]+1)] |
44 |
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#define s_phi(p) sensor[(p)+1] |
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#define s_val(t,p) sensor[(p)+1+(t+1)*(sntp[1]+1)] |
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47 |
greg |
2.1 |
static void comp_sensor(char *sfile); |
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49 |
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static void |
50 |
greg |
2.3 |
over_options() /* overriding options */ |
51 |
greg |
2.1 |
{ |
52 |
greg |
2.3 |
directvis = (ndsamps <= 0); |
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do_irrad = 0; |
54 |
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} |
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56 |
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static void |
57 |
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print_defaults() /* print out default parameters */ |
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{ |
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over_options(); |
60 |
greg |
2.1 |
printf("-n %-9d\t\t\t# number of processes\n", nprocs); |
61 |
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printf("-rd %-9ld\t\t\t# ray directions\n", nsamps); |
62 |
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/* printf("-rs %-9ld\t\t\t# ray super-samples\n", nssamps); */ |
63 |
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printf("-dn %-9d\t\t\t# direct number of samples\n", ndsamps); |
64 |
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printf("-vp %f %f %f\t# view point\n", |
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ourview.vp[0], ourview.vp[1], ourview.vp[2]); |
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printf("-vd %f %f %f\t# view direction\n", |
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ourview.vdir[0], ourview.vdir[1], ourview.vdir[2]); |
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printf("-vu %f %f %f\t# view up\n", |
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ourview.vup[0], ourview.vup[1], ourview.vup[2]); |
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printf("-vo %f\t\t\t# view fore clipping distance\n", ourview.vfore); |
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print_rdefaults(); |
72 |
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} |
73 |
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74 |
greg |
2.7 |
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75 |
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void |
76 |
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quit(ec) /* make sure exit is called */ |
77 |
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int ec; |
78 |
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{ |
79 |
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if (ray_pnprocs > 0) /* close children if any */ |
80 |
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ray_pclose(0); |
81 |
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exit(ec); |
82 |
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} |
83 |
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84 |
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85 |
greg |
2.1 |
int |
86 |
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main( |
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int argc, |
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char *argv[] |
89 |
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) |
90 |
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{ |
91 |
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int doheader = 1; |
92 |
greg |
2.3 |
int optwarn = 0; |
93 |
greg |
2.1 |
int i, rval; |
94 |
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95 |
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progname = argv[0]; |
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/* set up rendering defaults */ |
97 |
greg |
2.2 |
rand_samp = 1; |
98 |
greg |
2.6 |
dstrsrc = 0.65; |
99 |
greg |
2.2 |
srcsizerat = 0.1; |
100 |
greg |
2.1 |
directrelay = 3; |
101 |
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ambounce = 1; |
102 |
greg |
2.2 |
maxdepth = -10; |
103 |
greg |
2.1 |
/* get options from command line */ |
104 |
greg |
2.3 |
for (i = 1; i < argc; i++) { |
105 |
greg |
2.1 |
while ((rval = expandarg(&argc, &argv, i)) > 0) |
106 |
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; |
107 |
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if (rval < 0) { |
108 |
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sprintf(errmsg, "cannot expand '%s'", argv[i]); |
109 |
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error(SYSTEM, errmsg); |
110 |
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} |
111 |
greg |
2.3 |
if (argv[i][0] != '-') { |
112 |
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if (i >= argc-1) |
113 |
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break; /* final octree argument */ |
114 |
greg |
2.1 |
if (!ray_pnprocs) { |
115 |
greg |
2.3 |
over_options(); |
116 |
greg |
2.1 |
if (doheader) { /* print header */ |
117 |
greg |
2.6 |
newheader("RADIANCE", stdout); |
118 |
greg |
2.1 |
printargs(argc, argv, stdout); |
119 |
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fputformat("ascii", stdout); |
120 |
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putchar('\n'); |
121 |
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} |
122 |
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/* start process(es) */ |
123 |
greg |
2.8 |
if (strcmp(argv[argc-1], ".")) |
124 |
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ray_pinit(argv[argc-1], nprocs); |
125 |
greg |
2.1 |
} |
126 |
greg |
2.3 |
comp_sensor(argv[i]); /* process a sensor file */ |
127 |
greg |
2.1 |
continue; |
128 |
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} |
129 |
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if (argv[i][1] == 'r') { /* sampling options */ |
130 |
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if (argv[i][2] == 'd') |
131 |
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nsamps = atol(argv[++i]); |
132 |
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else if (argv[i][2] == 's') |
133 |
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nssamps = atol(argv[++i]); |
134 |
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else { |
135 |
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sprintf(errmsg, "bad option at '%s'", argv[i]); |
136 |
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error(USER, errmsg); |
137 |
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} |
138 |
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continue; |
139 |
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} |
140 |
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/* direct component samples */ |
141 |
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if (argv[i][1] == 'd' && argv[i][2] == 'n') { |
142 |
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ndsamps = atoi(argv[++i]); |
143 |
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continue; |
144 |
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} |
145 |
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if (argv[i][1] == 'v') { /* next sensor view */ |
146 |
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if (argv[i][2] == 'f') { |
147 |
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rval = viewfile(argv[++i], &ourview, NULL); |
148 |
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if (rval < 0) { |
149 |
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sprintf(errmsg, |
150 |
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"cannot open view file \"%s\"", |
151 |
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argv[i]); |
152 |
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error(SYSTEM, errmsg); |
153 |
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} else if (rval == 0) { |
154 |
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sprintf(errmsg, |
155 |
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"bad view file \"%s\"", |
156 |
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argv[i]); |
157 |
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error(USER, errmsg); |
158 |
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} |
159 |
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continue; |
160 |
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} |
161 |
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rval = getviewopt(&ourview, argc-i, argv+i); |
162 |
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if (rval >= 0) { |
163 |
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i += rval; |
164 |
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continue; |
165 |
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} |
166 |
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sprintf(errmsg, "bad view option at '%s'", argv[i]); |
167 |
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error(USER, errmsg); |
168 |
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} |
169 |
greg |
2.3 |
if (!strcmp(argv[i], "-w")) { /* toggle warnings */ |
170 |
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nowarn = !nowarn; |
171 |
greg |
2.1 |
continue; |
172 |
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} |
173 |
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if (ray_pnprocs) { |
174 |
greg |
2.3 |
if (!optwarn++) |
175 |
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error(WARNING, |
176 |
greg |
2.1 |
"rendering options should appear before first sensor"); |
177 |
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} else if (!strcmp(argv[i], "-defaults")) { |
178 |
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print_defaults(); |
179 |
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return(0); |
180 |
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} |
181 |
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if (argv[i][1] == 'h') { /* header toggle */ |
182 |
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doheader = !doheader; |
183 |
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continue; |
184 |
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} |
185 |
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if (!strcmp(argv[i], "-n")) { /* number of processes */ |
186 |
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nprocs = atoi(argv[++i]); |
187 |
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if (nprocs <= 0) |
188 |
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error(USER, "illegal number of processes"); |
189 |
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continue; |
190 |
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} |
191 |
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rval = getrenderopt(argc-i, argv+i); |
192 |
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if (rval < 0) { |
193 |
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sprintf(errmsg, "bad render option at '%s'", argv[i]); |
194 |
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error(USER, errmsg); |
195 |
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} |
196 |
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i += rval; |
197 |
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} |
198 |
greg |
2.8 |
if (sensor == NULL) |
199 |
greg |
2.3 |
error(USER, i<argc ? "missing sensor file" : "missing octree"); |
200 |
greg |
2.1 |
quit(0); |
201 |
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} |
202 |
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203 |
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/* Load sensor sensitivities (first row and column are angles) */ |
204 |
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static float * |
205 |
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load_sensor( |
206 |
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int ntp[2], |
207 |
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char *sfile |
208 |
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) |
209 |
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{ |
210 |
greg |
2.10 |
int warnedneg; |
211 |
greg |
2.1 |
char linebuf[8192]; |
212 |
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int nelem = 1000; |
213 |
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float *sarr = (float *)malloc(sizeof(float)*nelem); |
214 |
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FILE *fp; |
215 |
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char *cp; |
216 |
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int i; |
217 |
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218 |
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fp = frlibopen(sfile); |
219 |
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if (fp == NULL) { |
220 |
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sprintf(errmsg, "cannot open sensor file '%s'", sfile); |
221 |
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error(SYSTEM, errmsg); |
222 |
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} |
223 |
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fgets(linebuf, sizeof(linebuf), fp); |
224 |
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if (!strncmp(linebuf, "Elevation ", 10)) |
225 |
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fgets(linebuf, sizeof(linebuf), fp); |
226 |
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/* get phi values */ |
227 |
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sarr[0] = .0f; |
228 |
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if (strncmp(linebuf, "degrees", 7)) { |
229 |
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sprintf(errmsg, "Missing 'degrees' in sensor file '%s'", sfile); |
230 |
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error(USER, errmsg); |
231 |
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} |
232 |
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cp = sskip(linebuf); |
233 |
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ntp[1] = 0; |
234 |
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for ( ; ; ) { |
235 |
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sarr[ntp[1]+1] = atof(cp); |
236 |
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cp = fskip(cp); |
237 |
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if (cp == NULL) |
238 |
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break; |
239 |
greg |
2.9 |
if (ntp[1] > 1 && sarr[ntp[1]+1] <= sarr[ntp[1]]) { |
240 |
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sprintf(errmsg, |
241 |
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"Phi values not monotinically increasing in sensor file '%s'", |
242 |
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sfile); |
243 |
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error(USER, errmsg); |
244 |
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} |
245 |
greg |
2.1 |
++ntp[1]; |
246 |
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} |
247 |
greg |
2.10 |
warnedneg = 0; |
248 |
greg |
2.1 |
ntp[0] = 0; /* get thetas + data */ |
249 |
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while (fgets(linebuf, sizeof(linebuf), fp) != NULL) { |
250 |
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++ntp[0]; |
251 |
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if ((ntp[0]+1)*(ntp[1]+1) > nelem) { |
252 |
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nelem += (nelem>>2) + ntp[1]; |
253 |
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sarr = (float *)realloc((void *)sarr, |
254 |
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sizeof(float)*nelem); |
255 |
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if (sarr == NULL) |
256 |
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error(SYSTEM, "out of memory in load_sensor()"); |
257 |
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} |
258 |
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cp = linebuf; |
259 |
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i = ntp[0]*(ntp[1]+1); |
260 |
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for ( ; ; ) { |
261 |
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sarr[i] = atof(cp); |
262 |
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cp = fskip(cp); |
263 |
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if (cp == NULL) |
264 |
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break; |
265 |
greg |
2.10 |
if (i && sarr[i] < .0) { |
266 |
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if (!warnedneg++) { |
267 |
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sprintf(errmsg, |
268 |
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"Negative value(s) in sensor file '%s' (ignored)\n", sfile); |
269 |
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error(WARNING, errmsg); |
270 |
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} |
271 |
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sarr[i] = .0; |
272 |
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} |
273 |
greg |
2.1 |
++i; |
274 |
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} |
275 |
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if (i == ntp[0]*(ntp[1]+1)) |
276 |
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break; |
277 |
greg |
2.9 |
if (ntp[0] > 1 && sarr[ntp[0]*(ntp[1]+1)] <= |
278 |
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sarr[(ntp[0]-1)*(ntp[1]+1)]) { |
279 |
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sprintf(errmsg, |
280 |
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"Theta values not monotinically increasing in sensor file '%s'", |
281 |
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sfile); |
282 |
|
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error(USER, errmsg); |
283 |
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} |
284 |
greg |
2.1 |
if (i != (ntp[0]+1)*(ntp[1]+1)) { |
285 |
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sprintf(errmsg, |
286 |
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"bad column count near line %d in sensor file '%s'", |
287 |
|
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ntp[0]+1, sfile); |
288 |
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error(USER, errmsg); |
289 |
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} |
290 |
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} |
291 |
|
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nelem = i; |
292 |
|
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fclose(fp); |
293 |
|
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errmsg[0] = '\0'; /* sanity checks */ |
294 |
|
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if (ntp[0] <= 0) |
295 |
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sprintf(errmsg, "no data in sensor file '%s'", sfile); |
296 |
|
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else if (fabs(sarr[ntp[1]+1]) > FTINY) |
297 |
|
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sprintf(errmsg, "minimum theta must be 0 in sensor file '%s'", |
298 |
|
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sfile); |
299 |
|
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else if (fabs(sarr[1]) > FTINY) |
300 |
|
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sprintf(errmsg, "minimum phi must be 0 in sensor file '%s'", |
301 |
|
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sfile); |
302 |
|
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else if (sarr[ntp[1]] <= FTINY) |
303 |
|
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sprintf(errmsg, |
304 |
|
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"maximum phi must be positive in sensor file '%s'", |
305 |
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sfile); |
306 |
|
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else if (sarr[ntp[0]*(ntp[1]+1)] <= FTINY) |
307 |
|
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sprintf(errmsg, |
308 |
|
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"maximum theta must be positive in sensor file '%s'", |
309 |
|
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sfile); |
310 |
|
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if (errmsg[0]) |
311 |
|
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error(USER, errmsg); |
312 |
|
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return((float *)realloc((void *)sarr, sizeof(float)*nelem)); |
313 |
|
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} |
314 |
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|
315 |
|
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/* Initialize probability table */ |
316 |
|
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static void |
317 |
|
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init_ptable( |
318 |
|
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char *sfile |
319 |
|
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) |
320 |
|
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{ |
321 |
|
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int samptot = nsamps; |
322 |
|
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float *rowp, *rowp1; |
323 |
|
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double rowsum[MAXNT], rowomega[MAXNT]; |
324 |
|
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double thdiv[MAXNT+1], phdiv[MAXNP+1]; |
325 |
|
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double tsize, psize; |
326 |
|
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double prob, frac, frac1; |
327 |
|
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int i, j, t, p; |
328 |
|
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/* free old table */ |
329 |
|
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if (sensor != NULL) |
330 |
|
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free((void *)sensor); |
331 |
|
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if (pvals != NULL) |
332 |
|
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free((void *)pvals); |
333 |
|
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if (sfile == NULL || !*sfile) { |
334 |
greg |
2.2 |
sensor = NULL; |
335 |
|
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sntp[0] = sntp[1] = 0; |
336 |
greg |
2.1 |
pvals = NULL; |
337 |
|
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ntheta = nphi = 0; |
338 |
|
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return; |
339 |
|
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} |
340 |
|
|
/* load sensor table */ |
341 |
|
|
sensor = load_sensor(sntp, sfile); |
342 |
|
|
if (sntp[0] > MAXNT) { |
343 |
|
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sprintf(errmsg, "Too many theta rows in sensor file '%s'", |
344 |
|
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sfile); |
345 |
|
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error(INTERNAL, errmsg); |
346 |
|
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} |
347 |
|
|
if (sntp[1] > MAXNP) { |
348 |
|
|
sprintf(errmsg, "Too many phi columns in sensor file '%s'", |
349 |
|
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sfile); |
350 |
|
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error(INTERNAL, errmsg); |
351 |
|
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} |
352 |
|
|
/* compute boundary angles */ |
353 |
greg |
2.9 |
maxtheta = DEGREE*(1.5f*s_theta(sntp[0]-1) - 0.5f*s_theta(sntp[0]-2)); |
354 |
|
|
if (maxtheta > PI) |
355 |
|
|
maxtheta = PI; |
356 |
greg |
2.1 |
thdiv[0] = .0; |
357 |
|
|
for (t = 1; t < sntp[0]; t++) |
358 |
greg |
2.2 |
thdiv[t] = DEGREE/2.*(s_theta(t-1) + s_theta(t)); |
359 |
greg |
2.9 |
thdiv[sntp[0]] = maxtheta; |
360 |
|
|
phdiv[0] = DEGREE*(1.5f*s_phi(0) - 0.5f*s_phi(1)); |
361 |
greg |
2.1 |
for (p = 1; p < sntp[1]; p++) |
362 |
greg |
2.2 |
phdiv[p] = DEGREE/2.*(s_phi(p-1) + s_phi(p)); |
363 |
greg |
2.9 |
phdiv[sntp[1]] = DEGREE*(1.5f*s_phi(sntp[1]-1) - 0.5f*s_phi(sntp[1]-2)); |
364 |
greg |
2.1 |
/* size our table */ |
365 |
greg |
2.9 |
tsize = 1. - cos(maxtheta); |
366 |
|
|
psize = PI*tsize/maxtheta; |
367 |
greg |
2.1 |
if (sntp[0]*sntp[1] < samptot) /* don't overdo resolution */ |
368 |
|
|
samptot = sntp[0]*sntp[1]; |
369 |
greg |
2.2 |
ntheta = (int)(sqrt((double)samptot*tsize/psize) + 0.5); |
370 |
greg |
2.1 |
if (ntheta > MAXNT) |
371 |
|
|
ntheta = MAXNT; |
372 |
|
|
nphi = samptot/ntheta; |
373 |
greg |
2.9 |
pvals = (float *)malloc(sizeof(float)*(ntheta+1)*(nphi+1)); |
374 |
greg |
2.1 |
if (pvals == NULL) |
375 |
|
|
error(SYSTEM, "out of memory in init_ptable()"); |
376 |
|
|
gscale = .0; /* compute our inverse table */ |
377 |
|
|
for (i = 0; i < sntp[0]; i++) { |
378 |
greg |
2.2 |
rowp = &s_val(i,0); |
379 |
greg |
2.9 |
rowsum[i] = 1e-20; |
380 |
greg |
2.1 |
for (j = 0; j < sntp[1]; j++) |
381 |
|
|
rowsum[i] += *rowp++; |
382 |
|
|
rowomega[i] = cos(thdiv[i]) - cos(thdiv[i+1]); |
383 |
|
|
rowomega[i] *= 2.*PI / (double)sntp[1]; |
384 |
|
|
gscale += rowsum[i] * rowomega[i]; |
385 |
|
|
} |
386 |
greg |
2.9 |
if (gscale <= FTINY) { |
387 |
|
|
sprintf(errmsg, "Sensor values sum to zero in file '%s'", sfile); |
388 |
|
|
error(USER, errmsg); |
389 |
|
|
} |
390 |
greg |
2.2 |
for (i = 0; i < ntheta; i++) { |
391 |
greg |
2.1 |
prob = (double)i / (double)ntheta; |
392 |
|
|
for (t = 0; t < sntp[0]; t++) |
393 |
|
|
if ((prob -= rowsum[t]*rowomega[t]/gscale) <= .0) |
394 |
|
|
break; |
395 |
|
|
if (t >= sntp[0]) |
396 |
|
|
error(INTERNAL, "code error 1 in init_ptable()"); |
397 |
|
|
frac = 1. + prob/(rowsum[t]*rowomega[t]/gscale); |
398 |
|
|
tvals[i] = 1. - ( (1.-frac)*cos(thdiv[t]) + |
399 |
|
|
frac*cos(thdiv[t+1]) ); |
400 |
greg |
2.2 |
/* offset b/c sensor values are centered */ |
401 |
greg |
2.10 |
if (!t || (t < sntp[0]-1) & (frac >= 0.5)) |
402 |
greg |
2.2 |
frac -= 0.5; |
403 |
greg |
2.10 |
else { |
404 |
greg |
2.2 |
frac += 0.5; |
405 |
|
|
--t; |
406 |
|
|
} |
407 |
greg |
2.9 |
pvals[i*(nphi+1)] = phdiv[0]; |
408 |
greg |
2.1 |
for (j = 1; j < nphi; j++) { |
409 |
|
|
prob = (double)j / (double)nphi; |
410 |
greg |
2.2 |
rowp = &s_val(t,0); |
411 |
|
|
rowp1 = &s_val(t+1,0); |
412 |
greg |
2.9 |
for (p = 0; p < sntp[1]; p++) |
413 |
greg |
2.2 |
if ((prob -= (1.-frac)*rowp[p]/rowsum[t] + |
414 |
|
|
frac*rowp1[p]/rowsum[t+1]) <= .0) |
415 |
greg |
2.1 |
break; |
416 |
greg |
2.10 |
if (p >= sntp[1]) { /* should never happen? */ |
417 |
greg |
2.9 |
p = sntp[1] - 1; |
418 |
|
|
prob = .5; |
419 |
greg |
2.1 |
} |
420 |
greg |
2.9 |
frac1 = 1. + prob/((1.-frac)*rowp[p]/rowsum[t] |
421 |
|
|
+ frac*rowp1[p]/rowsum[t+1]); |
422 |
|
|
pvals[i*(nphi+1) + j] = (1.-frac1)*phdiv[p] + |
423 |
|
|
frac1*phdiv[p+1]; |
424 |
greg |
2.1 |
} |
425 |
greg |
2.9 |
pvals[i*(nphi+1) + nphi] = phdiv[sntp[1]]; |
426 |
greg |
2.1 |
} |
427 |
greg |
2.2 |
tvals[0] = .0f; |
428 |
greg |
2.1 |
tvals[ntheta] = (float)tsize; |
429 |
|
|
} |
430 |
|
|
|
431 |
|
|
/* Get normalized direction from random variables in [0,1) range */ |
432 |
|
|
static void |
433 |
|
|
get_direc( |
434 |
|
|
FVECT dvec, |
435 |
|
|
double x, |
436 |
|
|
double y |
437 |
|
|
) |
438 |
|
|
{ |
439 |
|
|
double xfrac = x*ntheta; |
440 |
|
|
int tndx = (int)xfrac; |
441 |
|
|
double yfrac = y*nphi; |
442 |
|
|
int pndx = (int)yfrac; |
443 |
|
|
double rad, phi; |
444 |
|
|
FVECT dv; |
445 |
|
|
int i; |
446 |
|
|
|
447 |
|
|
xfrac -= (double)tndx; |
448 |
|
|
yfrac -= (double)pndx; |
449 |
|
|
pndx += tndx*(nphi+1); |
450 |
|
|
|
451 |
|
|
dv[2] = 1. - ((1.-xfrac)*tvals[tndx] + xfrac*tvals[tndx+1]); |
452 |
|
|
rad = sqrt(1. - dv[2]*dv[2]); |
453 |
|
|
phi = (1.-yfrac)*pvals[pndx] + yfrac*pvals[pndx+1]; |
454 |
|
|
dv[0] = -rad*sin(phi); |
455 |
|
|
dv[1] = rad*cos(phi); |
456 |
|
|
for (i = 3; i--; ) |
457 |
|
|
dvec[i] = dv[0]*ourview.hvec[i] + |
458 |
|
|
dv[1]*ourview.vvec[i] + |
459 |
|
|
dv[2]*ourview.vdir[i] ; |
460 |
|
|
} |
461 |
|
|
|
462 |
|
|
/* Get sensor value in the specified direction (normalized) */ |
463 |
|
|
static float |
464 |
|
|
sens_val( |
465 |
|
|
FVECT dvec |
466 |
|
|
) |
467 |
|
|
{ |
468 |
|
|
FVECT dv; |
469 |
|
|
float theta, phi; |
470 |
|
|
int t, p; |
471 |
|
|
|
472 |
|
|
dv[2] = DOT(dvec, ourview.vdir); |
473 |
greg |
2.11 |
theta = acos(dv[2]); |
474 |
greg |
2.1 |
if (theta >= maxtheta) |
475 |
|
|
return(.0f); |
476 |
|
|
dv[0] = DOT(dvec, ourview.hvec); |
477 |
|
|
dv[1] = DOT(dvec, ourview.vvec); |
478 |
greg |
2.11 |
phi = atan2(-dv[0], dv[1]); |
479 |
|
|
while (phi < .0f) phi += (float)(2.*PI); |
480 |
greg |
2.1 |
t = (int)(theta/maxtheta * sntp[0]); |
481 |
greg |
2.11 |
p = (int)(phi*(1./(2.*PI)) * sntp[1]); |
482 |
greg |
2.1 |
/* hack for non-uniform sensor grid */ |
483 |
greg |
2.11 |
theta *= (float)(1./DEGREE); |
484 |
|
|
phi *= (float)(1./DEGREE); |
485 |
greg |
2.2 |
while (t+1 < sntp[0] && theta >= s_theta(t+1)) |
486 |
greg |
2.1 |
++t; |
487 |
greg |
2.2 |
while (t-1 >= 0 && theta <= s_theta(t-1)) |
488 |
greg |
2.1 |
--t; |
489 |
greg |
2.2 |
while (p+1 < sntp[1] && phi >= s_phi(p+1)) |
490 |
greg |
2.1 |
++p; |
491 |
greg |
2.2 |
while (p-1 >= 0 && phi <= s_phi(p-1)) |
492 |
greg |
2.1 |
--p; |
493 |
greg |
2.2 |
return(s_val(t,p)); |
494 |
greg |
2.1 |
} |
495 |
|
|
|
496 |
greg |
2.8 |
/* Print origin and direction */ |
497 |
|
|
static void |
498 |
|
|
print_ray( |
499 |
|
|
FVECT rorg, |
500 |
|
|
FVECT rdir |
501 |
|
|
) |
502 |
|
|
{ |
503 |
|
|
printf("%.6g %.6g %.6g %.8f %.8f %.8f\n", |
504 |
|
|
rorg[0], rorg[1], rorg[2], |
505 |
|
|
rdir[0], rdir[1], rdir[2]); |
506 |
|
|
} |
507 |
|
|
|
508 |
greg |
2.1 |
/* Compute sensor output */ |
509 |
|
|
static void |
510 |
|
|
comp_sensor( |
511 |
|
|
char *sfile |
512 |
|
|
) |
513 |
|
|
{ |
514 |
|
|
int ndirs = dstrsrc > FTINY ? ndsamps : |
515 |
|
|
ndsamps > 0 ? 1 : 0; |
516 |
|
|
char *err; |
517 |
|
|
int nt, np; |
518 |
|
|
COLOR vsum; |
519 |
|
|
RAY rr; |
520 |
greg |
2.6 |
double sf; |
521 |
greg |
2.1 |
int i, j; |
522 |
|
|
/* set view */ |
523 |
|
|
ourview.type = VT_ANG; |
524 |
|
|
ourview.horiz = ourview.vert = 180.; |
525 |
|
|
ourview.hoff = ourview.voff = .0; |
526 |
|
|
err = setview(&ourview); |
527 |
|
|
if (err != NULL) |
528 |
|
|
error(USER, err); |
529 |
|
|
/* assign probability table */ |
530 |
|
|
init_ptable(sfile); |
531 |
greg |
2.6 |
/* stratified MC sampling */ |
532 |
greg |
2.1 |
setcolor(vsum, .0f, .0f, .0f); |
533 |
|
|
nt = (int)(sqrt((double)nsamps*ntheta/nphi) + .5); |
534 |
|
|
np = nsamps/nt; |
535 |
greg |
2.6 |
sf = gscale/nsamps; |
536 |
greg |
2.1 |
for (i = 0; i < nt; i++) |
537 |
greg |
2.2 |
for (j = 0; j < np; j++) { |
538 |
greg |
2.5 |
VCOPY(rr.rorg, ourview.vp); |
539 |
greg |
2.2 |
get_direc(rr.rdir, (i+frandom())/nt, (j+frandom())/np); |
540 |
greg |
2.5 |
if (ourview.vfore > FTINY) |
541 |
|
|
VSUM(rr.rorg, rr.rorg, rr.rdir, ourview.vfore); |
542 |
greg |
2.8 |
if (!ray_pnprocs) { |
543 |
|
|
print_ray(rr.rorg, rr.rdir); |
544 |
|
|
continue; |
545 |
|
|
} |
546 |
greg |
2.5 |
rr.rmax = .0; |
547 |
greg |
2.12 |
rayorigin(&rr, PRIMARY|SPECULAR, NULL, NULL); |
548 |
greg |
2.6 |
scalecolor(rr.rcoef, sf); |
549 |
greg |
2.1 |
if (ray_pqueue(&rr) == 1) |
550 |
|
|
addcolor(vsum, rr.rcol); |
551 |
|
|
} |
552 |
greg |
2.6 |
/* remaining rays pure MC */ |
553 |
|
|
for (i = nsamps - nt*np; i-- > 0; ) { |
554 |
|
|
VCOPY(rr.rorg, ourview.vp); |
555 |
|
|
get_direc(rr.rdir, frandom(), frandom()); |
556 |
|
|
if (ourview.vfore > FTINY) |
557 |
|
|
VSUM(rr.rorg, rr.rorg, rr.rdir, ourview.vfore); |
558 |
greg |
2.8 |
if (!ray_pnprocs) { |
559 |
|
|
print_ray(rr.rorg, rr.rdir); |
560 |
|
|
continue; |
561 |
|
|
} |
562 |
greg |
2.6 |
rr.rmax = .0; |
563 |
greg |
2.12 |
rayorigin(&rr, PRIMARY|SPECULAR, NULL, NULL); |
564 |
greg |
2.6 |
scalecolor(rr.rcoef, sf); |
565 |
|
|
if (ray_pqueue(&rr) == 1) |
566 |
|
|
addcolor(vsum, rr.rcol); |
567 |
|
|
} |
568 |
greg |
2.8 |
if (!ray_pnprocs) /* just printing rays */ |
569 |
|
|
return; |
570 |
greg |
2.6 |
/* scale partial result */ |
571 |
|
|
scalecolor(vsum, sf); |
572 |
|
|
/* add direct component */ |
573 |
greg |
2.1 |
for (i = ndirs; i-- > 0; ) { |
574 |
|
|
SRCINDEX si; |
575 |
|
|
initsrcindex(&si); |
576 |
|
|
while (srcray(&rr, NULL, &si)) { |
577 |
greg |
2.6 |
sf = sens_val(rr.rdir); |
578 |
|
|
if (sf <= FTINY) |
579 |
greg |
2.1 |
continue; |
580 |
greg |
2.6 |
sf *= si.dom/ndirs; |
581 |
|
|
scalecolor(rr.rcoef, sf); |
582 |
greg |
2.1 |
if (ray_pqueue(&rr) == 1) { |
583 |
|
|
multcolor(rr.rcol, rr.rcoef); |
584 |
|
|
addcolor(vsum, rr.rcol); |
585 |
|
|
} |
586 |
|
|
} |
587 |
|
|
} |
588 |
greg |
2.6 |
/* finish our calculation */ |
589 |
greg |
2.1 |
while (ray_presult(&rr, 0) > 0) { |
590 |
|
|
multcolor(rr.rcol, rr.rcoef); |
591 |
|
|
addcolor(vsum, rr.rcol); |
592 |
|
|
} |
593 |
|
|
/* print our result */ |
594 |
|
|
printf("%.4e %.4e %.4e\n", colval(vsum,RED), |
595 |
|
|
colval(vsum,GRN), colval(vsum,BLU)); |
596 |
|
|
} |