1 |
#ifndef lint |
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static const char RCSid[] = "$Id: rtrace.c,v 2.29 2003/04/18 17:29:22 greg Exp $"; |
3 |
#endif |
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/* |
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* rtrace.c - program and variables for individual ray tracing. |
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*/ |
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|
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#include "copyright.h" |
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|
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/* |
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* Input is in the form: |
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* |
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* xorg yorg zorg xdir ydir zdir |
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* |
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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 |
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* 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 "platform.h" |
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#include "ray.h" |
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#include "otypes.h" |
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#include "resolu.h" |
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|
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CUBE thescene; /* our scene */ |
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OBJECT nsceneobjs; /* number of objects in our scene */ |
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|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
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|
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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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|
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extern void ambnotify(), tranotify(); |
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void (*addobjnotify[])() = {ambnotify, tranotify, NULL}; |
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char *tralist[128]; /* list of modifers to trace (or no) */ |
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int traincl = -1; /* include == 1, exclude == 0 */ |
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#define MAXTSET 511 /* maximum number in trace set */ |
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OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
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|
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int hresolu = 0; /* horizontal (scan) size */ |
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int vresolu = 0; /* vertical resolution */ |
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|
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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(), oputc(), |
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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])(); |
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static int castonly = 0; |
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|
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static void puta(), putf(), putd(); |
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|
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static void (*putreal)(); |
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|
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void bogusray(), rad(), irrad(), printvals(); |
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|
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|
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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 _WIN32 |
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if (inform != 'a') |
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SET_FILE_BINARY(fp); |
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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; |
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case 'f': putreal = putf; break; |
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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(); |
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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 */ |
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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 */ |
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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; |
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while (*vs) |
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switch (*vs++) { |
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case 't': /* trace */ |
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*table = NULL; |
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table = every_out; |
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trace = ourtrace; |
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castonly = 0; |
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break; |
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case 'o': /* origin */ |
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*table++ = oputo; |
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break; |
225 |
case 'd': /* direction */ |
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*table++ = oputd; |
227 |
break; |
228 |
case 'v': /* value */ |
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*table++ = oputv; |
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castonly = 0; |
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break; |
232 |
case 'l': /* effective distance */ |
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*table++ = oputl; |
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castonly = 0; |
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break; |
236 |
case 'c': /* local coordinates */ |
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*table++ = oputc; |
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break; |
239 |
case 'L': /* single ray length */ |
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*table++ = oputL; |
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break; |
242 |
case 'p': /* point */ |
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*table++ = oputp; |
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break; |
245 |
case 'n': /* perturbed normal */ |
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*table++ = oputn; |
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castonly = 0; |
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break; |
249 |
case 'N': /* unperturbed normal */ |
250 |
*table++ = oputN; |
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break; |
252 |
case 's': /* surface */ |
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*table++ = oputs; |
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break; |
255 |
case 'w': /* weight */ |
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*table++ = oputw; |
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break; |
258 |
case 'm': /* modifier */ |
259 |
*table++ = oputm; |
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break; |
261 |
} |
262 |
*table = NULL; |
263 |
} |
264 |
|
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|
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void |
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bogusray() /* print out empty record */ |
268 |
{ |
269 |
thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
270 |
thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
271 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
272 |
printvals(&thisray); |
273 |
} |
274 |
|
275 |
|
276 |
void |
277 |
rad(org, dir, dmax) /* compute and print ray value(s) */ |
278 |
FVECT org, dir; |
279 |
double dmax; |
280 |
{ |
281 |
VCOPY(thisray.rorg, org); |
282 |
VCOPY(thisray.rdir, dir); |
283 |
thisray.rmax = dmax; |
284 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
285 |
if (castonly) { |
286 |
if (!localhit(&thisray, &thescene)) |
287 |
if (thisray.ro == &Aftplane) { /* clipped */ |
288 |
thisray.ro = NULL; |
289 |
thisray.rot = FHUGE; |
290 |
} else |
291 |
sourcehit(&thisray); |
292 |
} else |
293 |
rayvalue(&thisray); |
294 |
printvals(&thisray); |
295 |
} |
296 |
|
297 |
|
298 |
void |
299 |
irrad(org, dir) /* compute immediate irradiance value */ |
300 |
FVECT org, dir; |
301 |
{ |
302 |
register int i; |
303 |
|
304 |
for (i = 0; i < 3; i++) { |
305 |
thisray.rorg[i] = org[i] + dir[i]; |
306 |
thisray.rdir[i] = -dir[i]; |
307 |
} |
308 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
309 |
/* pretend we hit surface */ |
310 |
thisray.rot = 1.0-1e-4; |
311 |
thisray.rod = 1.0; |
312 |
VCOPY(thisray.ron, dir); |
313 |
for (i = 0; i < 3; i++) /* fudge factor */ |
314 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
315 |
/* compute and print */ |
316 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
317 |
printvals(&thisray); |
318 |
} |
319 |
|
320 |
|
321 |
void |
322 |
printvals(r) /* print requested ray values */ |
323 |
RAY *r; |
324 |
{ |
325 |
register void (**tp)(); |
326 |
|
327 |
if (ray_out[0] == NULL) |
328 |
return; |
329 |
for (tp = ray_out; *tp != NULL; tp++) |
330 |
(**tp)(r); |
331 |
if (outform == 'a') |
332 |
putchar('\n'); |
333 |
} |
334 |
|
335 |
|
336 |
int |
337 |
getvec(vec, fmt, fp) /* get a vector from fp */ |
338 |
register FVECT vec; |
339 |
int fmt; |
340 |
FILE *fp; |
341 |
{ |
342 |
static float vf[3]; |
343 |
static double vd[3]; |
344 |
char buf[32]; |
345 |
register int i; |
346 |
|
347 |
switch (fmt) { |
348 |
case 'a': /* ascii */ |
349 |
for (i = 0; i < 3; i++) { |
350 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
351 |
!isflt(buf)) |
352 |
return(-1); |
353 |
vec[i] = atof(buf); |
354 |
} |
355 |
break; |
356 |
case 'f': /* binary float */ |
357 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
358 |
return(-1); |
359 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
360 |
break; |
361 |
case 'd': /* binary double */ |
362 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
363 |
return(-1); |
364 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
365 |
break; |
366 |
default: |
367 |
error(CONSISTENCY, "botched input format"); |
368 |
} |
369 |
return(0); |
370 |
} |
371 |
|
372 |
|
373 |
void |
374 |
tranotify(obj) /* record new modifier */ |
375 |
OBJECT obj; |
376 |
{ |
377 |
static int hitlimit = 0; |
378 |
register OBJREC *o = objptr(obj); |
379 |
register char **tralp; |
380 |
|
381 |
if (obj == OVOID) { /* starting over */ |
382 |
traset[0] = 0; |
383 |
hitlimit = 0; |
384 |
return; |
385 |
} |
386 |
if (hitlimit || !ismodifier(o->otype)) |
387 |
return; |
388 |
for (tralp = tralist; *tralp != NULL; tralp++) |
389 |
if (!strcmp(o->oname, *tralp)) { |
390 |
if (traset[0] >= MAXTSET) { |
391 |
error(WARNING, "too many modifiers in trace list"); |
392 |
hitlimit++; |
393 |
return; /* should this be fatal? */ |
394 |
} |
395 |
insertelem(traset, obj); |
396 |
return; |
397 |
} |
398 |
} |
399 |
|
400 |
|
401 |
static void |
402 |
ourtrace(r) /* print ray values */ |
403 |
RAY *r; |
404 |
{ |
405 |
register void (**tp)(); |
406 |
|
407 |
if (every_out[0] == NULL) |
408 |
return; |
409 |
if (r->ro == NULL) { |
410 |
if (traincl == 1) |
411 |
return; |
412 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
413 |
return; |
414 |
tabin(r); |
415 |
for (tp = every_out; *tp != NULL; tp++) |
416 |
(**tp)(r); |
417 |
putchar('\n'); |
418 |
} |
419 |
|
420 |
|
421 |
static void |
422 |
tabin(r) /* tab in appropriate amount */ |
423 |
RAY *r; |
424 |
{ |
425 |
register RAY *rp; |
426 |
|
427 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
428 |
putchar('\t'); |
429 |
} |
430 |
|
431 |
|
432 |
static void |
433 |
oputo(r) /* print origin */ |
434 |
RAY *r; |
435 |
{ |
436 |
(*putreal)(r->rorg[0]); |
437 |
(*putreal)(r->rorg[1]); |
438 |
(*putreal)(r->rorg[2]); |
439 |
} |
440 |
|
441 |
|
442 |
static void |
443 |
oputd(r) /* print direction */ |
444 |
RAY *r; |
445 |
{ |
446 |
(*putreal)(r->rdir[0]); |
447 |
(*putreal)(r->rdir[1]); |
448 |
(*putreal)(r->rdir[2]); |
449 |
} |
450 |
|
451 |
|
452 |
static void |
453 |
oputv(r) /* print value */ |
454 |
RAY *r; |
455 |
{ |
456 |
COLR cout; |
457 |
|
458 |
if (outform == 'c') { |
459 |
setcolr(cout, colval(r->rcol,RED), |
460 |
colval(r->rcol,GRN), |
461 |
colval(r->rcol,BLU)); |
462 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
463 |
return; |
464 |
} |
465 |
(*putreal)(colval(r->rcol,RED)); |
466 |
(*putreal)(colval(r->rcol,GRN)); |
467 |
(*putreal)(colval(r->rcol,BLU)); |
468 |
} |
469 |
|
470 |
|
471 |
static void |
472 |
oputl(r) /* print effective distance */ |
473 |
RAY *r; |
474 |
{ |
475 |
(*putreal)(r->rt); |
476 |
} |
477 |
|
478 |
|
479 |
static void |
480 |
oputL(r) /* print single ray length */ |
481 |
RAY *r; |
482 |
{ |
483 |
(*putreal)(r->rot); |
484 |
} |
485 |
|
486 |
|
487 |
static void |
488 |
oputc(r) /* print local coordinates */ |
489 |
RAY *r; |
490 |
{ |
491 |
(*putreal)(r->uv[0]); |
492 |
(*putreal)(r->uv[1]); |
493 |
} |
494 |
|
495 |
|
496 |
static void |
497 |
oputp(r) /* print point */ |
498 |
RAY *r; |
499 |
{ |
500 |
if (r->rot < FHUGE) { |
501 |
(*putreal)(r->rop[0]); |
502 |
(*putreal)(r->rop[1]); |
503 |
(*putreal)(r->rop[2]); |
504 |
} else { |
505 |
(*putreal)(0.0); |
506 |
(*putreal)(0.0); |
507 |
(*putreal)(0.0); |
508 |
} |
509 |
} |
510 |
|
511 |
|
512 |
static void |
513 |
oputN(r) /* print unperturbed normal */ |
514 |
RAY *r; |
515 |
{ |
516 |
if (r->rot < FHUGE) { |
517 |
(*putreal)(r->ron[0]); |
518 |
(*putreal)(r->ron[1]); |
519 |
(*putreal)(r->ron[2]); |
520 |
} else { |
521 |
(*putreal)(0.0); |
522 |
(*putreal)(0.0); |
523 |
(*putreal)(0.0); |
524 |
} |
525 |
} |
526 |
|
527 |
|
528 |
static void |
529 |
oputn(r) /* print perturbed normal */ |
530 |
RAY *r; |
531 |
{ |
532 |
FVECT pnorm; |
533 |
|
534 |
if (r->rot >= FHUGE) { |
535 |
(*putreal)(0.0); |
536 |
(*putreal)(0.0); |
537 |
(*putreal)(0.0); |
538 |
return; |
539 |
} |
540 |
raynormal(pnorm, r); |
541 |
(*putreal)(pnorm[0]); |
542 |
(*putreal)(pnorm[1]); |
543 |
(*putreal)(pnorm[2]); |
544 |
} |
545 |
|
546 |
|
547 |
static void |
548 |
oputs(r) /* print name */ |
549 |
RAY *r; |
550 |
{ |
551 |
if (r->ro != NULL) |
552 |
fputs(r->ro->oname, stdout); |
553 |
else |
554 |
putchar('*'); |
555 |
putchar('\t'); |
556 |
} |
557 |
|
558 |
|
559 |
static void |
560 |
oputw(r) /* print weight */ |
561 |
RAY *r; |
562 |
{ |
563 |
(*putreal)(r->rweight); |
564 |
} |
565 |
|
566 |
|
567 |
static void |
568 |
oputm(r) /* print modifier */ |
569 |
RAY *r; |
570 |
{ |
571 |
if (r->ro != NULL) |
572 |
if (r->ro->omod != OVOID) |
573 |
fputs(objptr(r->ro->omod)->oname, stdout); |
574 |
else |
575 |
fputs(VOIDID, stdout); |
576 |
else |
577 |
putchar('*'); |
578 |
putchar('\t'); |
579 |
} |
580 |
|
581 |
|
582 |
static void |
583 |
puta(v) /* print ascii value */ |
584 |
double v; |
585 |
{ |
586 |
printf("%e\t", v); |
587 |
} |
588 |
|
589 |
|
590 |
static void |
591 |
putd(v) /* print binary double */ |
592 |
double v; |
593 |
{ |
594 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
595 |
} |
596 |
|
597 |
|
598 |
static void |
599 |
putf(v) /* print binary float */ |
600 |
double v; |
601 |
{ |
602 |
float f = v; |
603 |
|
604 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
605 |
} |