1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id$"; |
3 |
#endif |
4 |
/* |
5 |
* rtrace.c - program and variables for individual ray tracing. |
6 |
*/ |
7 |
|
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#include "copyright.h" |
9 |
|
10 |
/* |
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* Input is in the form: |
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* |
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* xorg yorg zorg xdir ydir zdir |
14 |
* |
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* The direction need not be normalized. Output is flexible. |
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* If the direction vector is (0,0,0), then the output is flushed. |
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* All values default to ascii representation of real |
18 |
* numbers. Binary representations can be selected |
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* with '-ff' for float or '-fd' for double. By default, |
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* radiance is computed. The '-i' or '-I' options indicate that |
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* irradiance values are desired. |
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*/ |
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|
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#include "ray.h" |
25 |
|
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#include "otypes.h" |
27 |
|
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#include "resolu.h" |
29 |
|
30 |
CUBE thescene; /* our scene */ |
31 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
32 |
|
33 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
35 |
int samplendx = 0; /* index for this sample */ |
36 |
|
37 |
int imm_irrad = 0; /* compute immediate irradiance? */ |
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int lim_dist = 0; /* limit distance? */ |
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|
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int inform = 'a'; /* input format */ |
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int outform = 'a'; /* output format */ |
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char *outvals = "v"; /* output specification */ |
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|
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int do_irrad = 0; /* compute irradiance? */ |
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|
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void (*trace)() = NULL; /* trace call */ |
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|
48 |
extern void ambnotify(), tranotify(); |
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void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
50 |
char *tralist[128]; /* list of modifers to trace (or no) */ |
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int traincl = -1; /* include == 1, exclude == 0 */ |
52 |
#define MAXTSET 511 /* maximum number in trace set */ |
53 |
OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
54 |
|
55 |
int hresolu = 0; /* horizontal (scan) size */ |
56 |
int vresolu = 0; /* vertical resolution */ |
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|
58 |
double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .05; /* shadow threshold */ |
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double shadcert = .5; /* shadow certainty */ |
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int directrelay = 2; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
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int directvis = 1; /* sources visible? */ |
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double srcsizerat = .2; /* maximum ratio source size/dist. */ |
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|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
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COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
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double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
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double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
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int backvis = 1; /* back face visibility */ |
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|
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int maxdepth = 6; /* maximum recursion depth */ |
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double minweight = 4e-3; /* minimum ray weight */ |
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|
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char *ambfile = NULL; /* ambient file name */ |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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int ambvwt = 0; /* initial weight for ambient value */ |
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double ambacc = 0.2; /* ambient accuracy */ |
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int ambres = 128; /* ambient resolution */ |
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int ambdiv = 512; /* ambient divisions */ |
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int ambssamp = 0; /* ambient super-samples */ |
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int ambounce = 0; /* ambient bounces */ |
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char *amblist[128]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
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|
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static RAY thisray; /* for our convenience */ |
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|
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static void oputo(), oputd(), oputv(), oputl(), oputL(), |
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oputp(), oputn(), oputN(), oputs(), oputw(), oputm(); |
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|
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static void ourtrace(), tabin(); |
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static void (*ray_out[16])(), (*every_out[16])(); |
98 |
static int castonly = 0; |
99 |
|
100 |
static void puta(), putf(), putd(); |
101 |
|
102 |
static void (*putreal)(); |
103 |
|
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void bogusray(), rad(), irrad(), printvals(); |
105 |
|
106 |
|
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void |
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quit(code) /* quit program */ |
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int code; |
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{ |
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#ifndef NIX |
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headclean(); /* delete header file */ |
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pfclean(); /* clean up persist files */ |
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#endif |
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exit(code); |
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} |
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|
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|
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char * |
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formstr(f) /* return format identifier */ |
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int f; |
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{ |
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switch (f) { |
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case 'a': return("ascii"); |
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case 'f': return("float"); |
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case 'd': return("double"); |
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case 'c': return(COLRFMT); |
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} |
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return("unknown"); |
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} |
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|
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|
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void |
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rtrace(fname) /* trace rays from file */ |
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char *fname; |
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{ |
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long vcount = hresolu>1 ? hresolu*vresolu : vresolu; |
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long nextflush = hresolu; |
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FILE *fp; |
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double d; |
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FVECT orig, direc; |
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/* set up input */ |
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if (fname == NULL) |
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fp = stdin; |
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else if ((fp = fopen(fname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open input file \"%s\"", fname); |
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error(SYSTEM, errmsg); |
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} |
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#ifdef MSDOS |
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if (inform != 'a') |
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setmode(fileno(fp), O_BINARY); |
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#endif |
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/* set up output */ |
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setoutput(outvals); |
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switch (outform) { |
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case 'a': putreal = puta; break; |
157 |
case 'f': putreal = putf; break; |
158 |
case 'd': putreal = putd; break; |
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case 'c': |
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if (strcmp(outvals, "v")) |
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error(USER, "color format with value output only"); |
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break; |
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default: |
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error(CONSISTENCY, "botched output format"); |
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} |
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if (hresolu > 0) { |
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if (vresolu > 0) |
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fprtresolu(hresolu, vresolu, stdout); |
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fflush(stdout); |
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} |
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/* process file */ |
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while (getvec(orig, inform, fp) == 0 && |
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getvec(direc, inform, fp) == 0) { |
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|
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d = normalize(direc); |
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if (d == 0.0) { /* zero ==> flush */ |
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bogusray(); |
178 |
if (--nextflush <= 0 || vcount <= 0) { |
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fflush(stdout); |
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nextflush = hresolu; |
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} |
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} else { |
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samplendx++; |
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/* compute and print */ |
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if (imm_irrad) |
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irrad(orig, direc); |
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else |
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rad(orig, direc, lim_dist ? d : 0.0); |
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/* flush if time */ |
190 |
if (--nextflush == 0) { |
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fflush(stdout); |
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nextflush = hresolu; |
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} |
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} |
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if (ferror(stdout)) |
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error(SYSTEM, "write error"); |
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if (--vcount == 0) /* check for end */ |
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break; |
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} |
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fflush(stdout); |
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if (vcount > 0) |
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error(USER, "read error"); |
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if (fname != NULL) |
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fclose(fp); |
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} |
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|
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|
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setoutput(vs) /* set up output tables */ |
209 |
register char *vs; |
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{ |
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extern void (*trace)(); |
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register void (**table)() = ray_out; |
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|
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castonly = 1; |
215 |
while (*vs) |
216 |
switch (*vs++) { |
217 |
case 't': /* trace */ |
218 |
*table = NULL; |
219 |
table = every_out; |
220 |
trace = ourtrace; |
221 |
castonly = 0; |
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break; |
223 |
case 'o': /* origin */ |
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*table++ = oputo; |
225 |
break; |
226 |
case 'd': /* direction */ |
227 |
*table++ = oputd; |
228 |
break; |
229 |
case 'v': /* value */ |
230 |
*table++ = oputv; |
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castonly = 0; |
232 |
break; |
233 |
case 'l': /* effective distance */ |
234 |
*table++ = oputl; |
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castonly = 0; |
236 |
break; |
237 |
case 'L': /* single ray length */ |
238 |
*table++ = oputL; |
239 |
break; |
240 |
case 'p': /* point */ |
241 |
*table++ = oputp; |
242 |
break; |
243 |
case 'n': /* perturbed normal */ |
244 |
*table++ = oputn; |
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castonly = 0; |
246 |
break; |
247 |
case 'N': /* unperturbed normal */ |
248 |
*table++ = oputN; |
249 |
break; |
250 |
case 's': /* surface */ |
251 |
*table++ = oputs; |
252 |
break; |
253 |
case 'w': /* weight */ |
254 |
*table++ = oputw; |
255 |
break; |
256 |
case 'm': /* modifier */ |
257 |
*table++ = oputm; |
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break; |
259 |
} |
260 |
*table = NULL; |
261 |
} |
262 |
|
263 |
|
264 |
void |
265 |
bogusray() /* print out empty record */ |
266 |
{ |
267 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
268 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
269 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
270 |
printvals(&thisray); |
271 |
} |
272 |
|
273 |
|
274 |
void |
275 |
rad(org, dir, dmax) /* compute and print ray value(s) */ |
276 |
FVECT org, dir; |
277 |
double dmax; |
278 |
{ |
279 |
VCOPY(thisray.rorg, org); |
280 |
VCOPY(thisray.rdir, dir); |
281 |
thisray.rmax = dmax; |
282 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
283 |
if (castonly) { |
284 |
if (!localhit(&thisray, &thescene)) |
285 |
if (thisray.ro == &Aftplane) { /* clipped */ |
286 |
thisray.ro = NULL; |
287 |
thisray.rot = FHUGE; |
288 |
} else |
289 |
sourcehit(&thisray); |
290 |
} else |
291 |
rayvalue(&thisray); |
292 |
printvals(&thisray); |
293 |
} |
294 |
|
295 |
|
296 |
void |
297 |
irrad(org, dir) /* compute immediate irradiance value */ |
298 |
FVECT org, dir; |
299 |
{ |
300 |
register int i; |
301 |
|
302 |
for (i = 0; i < 3; i++) { |
303 |
thisray.rorg[i] = org[i] + dir[i]; |
304 |
thisray.rdir[i] = -dir[i]; |
305 |
} |
306 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
307 |
/* pretend we hit surface */ |
308 |
thisray.rot = 1.0-1e-4; |
309 |
thisray.rod = 1.0; |
310 |
VCOPY(thisray.ron, dir); |
311 |
for (i = 0; i < 3; i++) /* fudge factor */ |
312 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
313 |
/* compute and print */ |
314 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
315 |
printvals(&thisray); |
316 |
} |
317 |
|
318 |
|
319 |
void |
320 |
printvals(r) /* print requested ray values */ |
321 |
RAY *r; |
322 |
{ |
323 |
register void (**tp)(); |
324 |
|
325 |
if (ray_out[0] == NULL) |
326 |
return; |
327 |
for (tp = ray_out; *tp != NULL; tp++) |
328 |
(**tp)(r); |
329 |
if (outform == 'a') |
330 |
putchar('\n'); |
331 |
} |
332 |
|
333 |
|
334 |
int |
335 |
getvec(vec, fmt, fp) /* get a vector from fp */ |
336 |
register FVECT vec; |
337 |
int fmt; |
338 |
FILE *fp; |
339 |
{ |
340 |
static float vf[3]; |
341 |
static double vd[3]; |
342 |
char buf[32]; |
343 |
register int i; |
344 |
|
345 |
switch (fmt) { |
346 |
case 'a': /* ascii */ |
347 |
for (i = 0; i < 3; i++) { |
348 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
349 |
!isflt(buf)) |
350 |
return(-1); |
351 |
vec[i] = atof(buf); |
352 |
} |
353 |
break; |
354 |
case 'f': /* binary float */ |
355 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
356 |
return(-1); |
357 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
358 |
break; |
359 |
case 'd': /* binary double */ |
360 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
361 |
return(-1); |
362 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
363 |
break; |
364 |
default: |
365 |
error(CONSISTENCY, "botched input format"); |
366 |
} |
367 |
return(0); |
368 |
} |
369 |
|
370 |
|
371 |
void |
372 |
tranotify(obj) /* record new modifier */ |
373 |
OBJECT obj; |
374 |
{ |
375 |
static int hitlimit = 0; |
376 |
register OBJREC *o = objptr(obj); |
377 |
register char **tralp; |
378 |
|
379 |
if (obj == OVOID) { /* starting over */ |
380 |
traset[0] = 0; |
381 |
hitlimit = 0; |
382 |
return; |
383 |
} |
384 |
if (hitlimit || !ismodifier(o->otype)) |
385 |
return; |
386 |
for (tralp = tralist; *tralp != NULL; tralp++) |
387 |
if (!strcmp(o->oname, *tralp)) { |
388 |
if (traset[0] >= MAXTSET) { |
389 |
error(WARNING, "too many modifiers in trace list"); |
390 |
hitlimit++; |
391 |
return; /* should this be fatal? */ |
392 |
} |
393 |
insertelem(traset, obj); |
394 |
return; |
395 |
} |
396 |
} |
397 |
|
398 |
|
399 |
static void |
400 |
ourtrace(r) /* print ray values */ |
401 |
RAY *r; |
402 |
{ |
403 |
register void (**tp)(); |
404 |
|
405 |
if (every_out[0] == NULL) |
406 |
return; |
407 |
if (r->ro == NULL) { |
408 |
if (traincl == 1) |
409 |
return; |
410 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
411 |
return; |
412 |
tabin(r); |
413 |
for (tp = every_out; *tp != NULL; tp++) |
414 |
(**tp)(r); |
415 |
putchar('\n'); |
416 |
} |
417 |
|
418 |
|
419 |
static void |
420 |
tabin(r) /* tab in appropriate amount */ |
421 |
RAY *r; |
422 |
{ |
423 |
register RAY *rp; |
424 |
|
425 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
426 |
putchar('\t'); |
427 |
} |
428 |
|
429 |
|
430 |
static void |
431 |
oputo(r) /* print origin */ |
432 |
register RAY *r; |
433 |
{ |
434 |
(*putreal)(r->rorg[0]); |
435 |
(*putreal)(r->rorg[1]); |
436 |
(*putreal)(r->rorg[2]); |
437 |
} |
438 |
|
439 |
|
440 |
static void |
441 |
oputd(r) /* print direction */ |
442 |
register RAY *r; |
443 |
{ |
444 |
(*putreal)(r->rdir[0]); |
445 |
(*putreal)(r->rdir[1]); |
446 |
(*putreal)(r->rdir[2]); |
447 |
} |
448 |
|
449 |
|
450 |
static void |
451 |
oputv(r) /* print value */ |
452 |
register RAY *r; |
453 |
{ |
454 |
COLR cout; |
455 |
|
456 |
if (outform == 'c') { |
457 |
setcolr(cout, colval(r->rcol,RED), |
458 |
colval(r->rcol,GRN), |
459 |
colval(r->rcol,BLU)); |
460 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
461 |
return; |
462 |
} |
463 |
(*putreal)(colval(r->rcol,RED)); |
464 |
(*putreal)(colval(r->rcol,GRN)); |
465 |
(*putreal)(colval(r->rcol,BLU)); |
466 |
} |
467 |
|
468 |
|
469 |
static void |
470 |
oputl(r) /* print effective distance */ |
471 |
register RAY *r; |
472 |
{ |
473 |
(*putreal)(r->rt); |
474 |
} |
475 |
|
476 |
|
477 |
static void |
478 |
oputL(r) /* print single ray length */ |
479 |
register RAY *r; |
480 |
{ |
481 |
(*putreal)(r->rot); |
482 |
} |
483 |
|
484 |
|
485 |
static void |
486 |
oputp(r) /* print point */ |
487 |
register RAY *r; |
488 |
{ |
489 |
if (r->rot < FHUGE) { |
490 |
(*putreal)(r->rop[0]); |
491 |
(*putreal)(r->rop[1]); |
492 |
(*putreal)(r->rop[2]); |
493 |
} else { |
494 |
(*putreal)(0.0); |
495 |
(*putreal)(0.0); |
496 |
(*putreal)(0.0); |
497 |
} |
498 |
} |
499 |
|
500 |
|
501 |
static void |
502 |
oputN(r) /* print unperturbed normal */ |
503 |
register RAY *r; |
504 |
{ |
505 |
if (r->rot < FHUGE) { |
506 |
(*putreal)(r->ron[0]); |
507 |
(*putreal)(r->ron[1]); |
508 |
(*putreal)(r->ron[2]); |
509 |
} else { |
510 |
(*putreal)(0.0); |
511 |
(*putreal)(0.0); |
512 |
(*putreal)(0.0); |
513 |
} |
514 |
} |
515 |
|
516 |
|
517 |
static void |
518 |
oputn(r) /* print perturbed normal */ |
519 |
RAY *r; |
520 |
{ |
521 |
FVECT pnorm; |
522 |
|
523 |
if (r->rot >= FHUGE) { |
524 |
(*putreal)(0.0); |
525 |
(*putreal)(0.0); |
526 |
(*putreal)(0.0); |
527 |
return; |
528 |
} |
529 |
raynormal(pnorm, r); |
530 |
(*putreal)(pnorm[0]); |
531 |
(*putreal)(pnorm[1]); |
532 |
(*putreal)(pnorm[2]); |
533 |
} |
534 |
|
535 |
|
536 |
static void |
537 |
oputs(r) /* print name */ |
538 |
register RAY *r; |
539 |
{ |
540 |
if (r->ro != NULL) |
541 |
fputs(r->ro->oname, stdout); |
542 |
else |
543 |
putchar('*'); |
544 |
putchar('\t'); |
545 |
} |
546 |
|
547 |
|
548 |
static void |
549 |
oputw(r) /* print weight */ |
550 |
register RAY *r; |
551 |
{ |
552 |
(*putreal)(r->rweight); |
553 |
} |
554 |
|
555 |
|
556 |
static void |
557 |
oputm(r) /* print modifier */ |
558 |
register RAY *r; |
559 |
{ |
560 |
if (r->ro != NULL) |
561 |
if (r->ro->omod != OVOID) |
562 |
fputs(objptr(r->ro->omod)->oname, stdout); |
563 |
else |
564 |
fputs(VOIDID, stdout); |
565 |
else |
566 |
putchar('*'); |
567 |
putchar('\t'); |
568 |
} |
569 |
|
570 |
|
571 |
static void |
572 |
puta(v) /* print ascii value */ |
573 |
double v; |
574 |
{ |
575 |
printf("%e\t", v); |
576 |
} |
577 |
|
578 |
|
579 |
static void |
580 |
putd(v) /* print binary double */ |
581 |
double v; |
582 |
{ |
583 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
584 |
} |
585 |
|
586 |
|
587 |
static void |
588 |
putf(v) /* print binary float */ |
589 |
double v; |
590 |
{ |
591 |
float f = v; |
592 |
|
593 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
594 |
} |