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/* Copyright (c) 1992 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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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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* 6/11/86 |
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*/ |
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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 "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "resolu.h" |
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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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|
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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 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 = 1; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
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int directinvis = 0; /* sources invisible? */ |
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double srcsizerat = .25; /* maximum ratio source size/dist. */ |
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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 maxdepth = 6; /* maximum recursion depth */ |
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double minweight = 4e-3; /* minimum ray weight */ |
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|
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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double ambacc = 0.2; /* ambient accuracy */ |
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int ambres = 32; /* ambient resolution */ |
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int ambdiv = 128; /* 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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extern OBJREC Lamb; /* a Lambertian surface */ |
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|
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static RAY thisray; /* for our convenience */ |
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|
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static int oputo(), oputd(), oputv(), oputl(), oputL(), |
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oputp(), oputn(), oputs(), oputw(), oputm(); |
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|
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static int (*ray_out[10])(), (*every_out[10])(); |
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static int castonly; |
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|
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static int puta(), putf(), putd(); |
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|
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static int (*putreal)(); |
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|
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|
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quit(code) /* quit program */ |
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int code; |
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{ |
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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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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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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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/* 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 && vresolu > 0) |
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fprtresolu(hresolu, vresolu, stdout); |
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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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if (normalize(direc) == 0.0) { /* zero ==> flush */ |
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fflush(stdout); |
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continue; |
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} |
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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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traceray(orig, direc); |
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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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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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if (vcount > 0) |
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error(USER, "read error"); |
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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 int ourtrace(), (*trace)(); |
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register int (**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; |
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case 'd': /* direction */ |
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*table++ = oputd; |
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break; |
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case 'v': /* value */ |
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*table++ = oputv; |
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castonly = 0; |
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break; |
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case 'l': /* effective distance */ |
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*table++ = oputl; |
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castonly = 0; |
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break; |
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case 'L': /* single ray length */ |
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*table++ = oputL; |
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break; |
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case 'p': /* point */ |
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*table++ = oputp; |
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break; |
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case 'n': /* normal */ |
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*table++ = oputn; |
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break; |
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case 's': /* surface */ |
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*table++ = oputs; |
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break; |
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case 'w': /* weight */ |
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*table++ = oputw; |
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break; |
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case 'm': /* modifier */ |
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*table++ = oputm; |
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break; |
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} |
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*table = NULL; |
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} |
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|
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|
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traceray(org, dir) /* compute and print ray value(s) */ |
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FVECT org, dir; |
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{ |
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register int (**tp)(); |
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|
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VCOPY(thisray.rorg, org); |
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VCOPY(thisray.rdir, dir); |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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if (castonly) |
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localhit(&thisray, &thescene) || sourcehit(&thisray); |
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else |
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rayvalue(&thisray); |
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|
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if (ray_out[0] == NULL) |
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return; |
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for (tp = ray_out; *tp != NULL; tp++) |
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(**tp)(&thisray); |
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if (outform == 'a') |
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putchar('\n'); |
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} |
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|
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|
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irrad(org, dir) /* compute immediate irradiance value */ |
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FVECT org, dir; |
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{ |
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register int i; |
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|
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for (i = 0; i < 3; i++) { |
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thisray.rorg[i] = org[i] + dir[i]; |
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thisray.rdir[i] = -dir[i]; |
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} |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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/* pretend we hit surface */ |
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thisray.rot = 1.0; |
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thisray.rod = 1.0; |
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VCOPY(thisray.ron, dir); |
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for (i = 0; i < 3; i++) /* fudge factor */ |
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thisray.rop[i] = org[i] + 1e-4*dir[i]; |
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/* compute and print */ |
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(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
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oputv(&thisray); |
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if (outform == 'a') |
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putchar('\n'); |
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} |
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|
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|
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getvec(vec, fmt, fp) /* get a vector from fp */ |
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register FVECT vec; |
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int fmt; |
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FILE *fp; |
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{ |
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extern char *fgetword(); |
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static float vf[3]; |
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static double vd[3]; |
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char buf[32]; |
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register int i; |
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|
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switch (fmt) { |
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case 'a': /* ascii */ |
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for (i = 0; i < 3; i++) { |
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if (fgetword(buf, sizeof(buf), fp) == NULL || |
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!isflt(buf)) |
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return(-1); |
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vec[i] = atof(buf); |
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} |
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break; |
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case 'f': /* binary float */ |
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if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
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return(-1); |
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vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
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break; |
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case 'd': /* binary double */ |
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if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
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return(-1); |
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vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
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break; |
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default: |
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error(CONSISTENCY, "botched input format"); |
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} |
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return(0); |
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} |
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|
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|
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static |
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ourtrace(r) /* print ray values */ |
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RAY *r; |
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{ |
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register int (**tp)(); |
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|
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if (every_out[0] == NULL) |
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return; |
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tabin(r); |
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for (tp = every_out; *tp != NULL; tp++) |
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(**tp)(r); |
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putchar('\n'); |
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} |
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|
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|
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static |
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tabin(r) /* tab in appropriate amount */ |
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RAY *r; |
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{ |
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register RAY *rp; |
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|
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for (rp = r->parent; rp != NULL; rp = rp->parent) |
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putchar('\t'); |
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} |
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|
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|
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static |
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oputo(r) /* print origin */ |
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register RAY *r; |
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{ |
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(*putreal)(r->rorg[0]); |
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(*putreal)(r->rorg[1]); |
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(*putreal)(r->rorg[2]); |
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} |
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|
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|
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static |
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oputd(r) /* print direction */ |
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register RAY *r; |
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{ |
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(*putreal)(r->rdir[0]); |
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(*putreal)(r->rdir[1]); |
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(*putreal)(r->rdir[2]); |
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} |
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|
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|
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static |
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oputv(r) /* print value */ |
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register RAY *r; |
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{ |
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COLR cout; |
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|
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if (outform == 'c') { |
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setcolr(cout, colval(r->rcol,RED), |
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colval(r->rcol,GRN), |
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colval(r->rcol,BLU)); |
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fwrite((char *)cout, sizeof(cout), 1, stdout); |
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return; |
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} |
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(*putreal)(colval(r->rcol,RED)); |
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(*putreal)(colval(r->rcol,GRN)); |
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(*putreal)(colval(r->rcol,BLU)); |
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} |
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|
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|
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static |
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oputl(r) /* print effective distance */ |
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register RAY *r; |
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{ |
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(*putreal)(r->rt); |
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} |
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|
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|
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static |
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oputL(r) /* print single ray length */ |
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register RAY *r; |
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{ |
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(*putreal)(r->rot); |
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} |
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|
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|
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static |
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oputp(r) /* print point */ |
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register RAY *r; |
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{ |
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if (r->rot < FHUGE) { |
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(*putreal)(r->rop[0]); |
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(*putreal)(r->rop[1]); |
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(*putreal)(r->rop[2]); |
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} else { |
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(*putreal)(0.0); |
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(*putreal)(0.0); |
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(*putreal)(0.0); |
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} |
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} |
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|
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|
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static |
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oputn(r) /* print normal */ |
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register RAY *r; |
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{ |
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if (r->rot < FHUGE) { |
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(*putreal)(r->ron[0]); |
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(*putreal)(r->ron[1]); |
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(*putreal)(r->ron[2]); |
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} else { |
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(*putreal)(0.0); |
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(*putreal)(0.0); |
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(*putreal)(0.0); |
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} |
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} |
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|
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|
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static |
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oputs(r) /* print name */ |
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register RAY *r; |
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{ |
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if (r->ro != NULL) |
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fputs(r->ro->oname, stdout); |
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else |
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putchar('*'); |
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putchar('\t'); |
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} |
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|
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|
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static |
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oputw(r) /* print weight */ |
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register RAY *r; |
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{ |
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(*putreal)(r->rweight); |
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} |
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|
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|
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static |
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oputm(r) /* print modifier */ |
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register RAY *r; |
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{ |
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if (r->ro != NULL) |
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fputs(objptr(r->ro->omod)->oname, stdout); |
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else |
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putchar('*'); |
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putchar('\t'); |
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} |
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|
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|
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static |
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puta(v) /* print ascii value */ |
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double v; |
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{ |
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printf("%e\t", v); |
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} |
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|
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|
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static |
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putd(v) /* print binary double */ |
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double v; |
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{ |
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fwrite((char *)&v, sizeof(v), 1, stdout); |
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} |
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|
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|
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static |
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putf(v) /* print binary float */ |
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double v; |
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{ |
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float f = v; |
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|
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fwrite((char *)&f, sizeof(f), 1, stdout); |
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} |
