| 1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* rtrace.c - program and variables for individual ray tracing. |
| 9 |
* |
| 10 |
* 6/11/86 |
| 11 |
*/ |
| 12 |
|
| 13 |
/* |
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* Input is in the form: |
| 15 |
* |
| 16 |
* xorg yorg zorg xdir ydir zdir |
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* |
| 18 |
* The direction need not be normalized. Output is flexible. |
| 19 |
* 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 |
| 21 |
* numbers. Binary representations can be selected |
| 22 |
* with '-ff' for float or '-fd' for double. By default, |
| 23 |
* radiance is computed. The '-i' or '-I' options indicate that |
| 24 |
* irradiance values are desired. |
| 25 |
*/ |
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|
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#include "ray.h" |
| 28 |
|
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#include "octree.h" |
| 30 |
|
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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 */ |
| 36 |
int ndims = 0; /* number of sampling dimensions */ |
| 37 |
int samplendx = 0; /* index for this sample */ |
| 38 |
|
| 39 |
int imm_irrad = 0; /* compute immediate irradiance? */ |
| 40 |
int lim_dist = 0; /* limit distance? */ |
| 41 |
|
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int inform = 'a'; /* input format */ |
| 43 |
int outform = 'a'; /* output format */ |
| 44 |
char *outvals = "v"; /* output specification */ |
| 45 |
|
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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 */ |
| 49 |
OBJECT traset[MAXTSET+1]={0}; /* trace include/exclude set */ |
| 50 |
|
| 51 |
int hresolu = 0; /* horizontal (scan) size */ |
| 52 |
int vresolu = 0; /* vertical resolution */ |
| 53 |
|
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double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .05; /* shadow threshold */ |
| 56 |
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 */ |
| 64 |
double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
| 66 |
|
| 67 |
double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
| 70 |
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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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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extern OBJREC Lamb; /* a Lambertian surface */ |
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extern OBJREC Aftplane; /* aft clipping object */ |
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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 int oputo(), oputd(), oputv(), oputl(), oputL(), |
| 92 |
oputp(), oputn(), oputN(), oputs(), oputw(), oputm(); |
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|
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static int ourtrace(), tabin(); |
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static int (*ray_out[16])(), (*every_out[16])(); |
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static int castonly = 0; |
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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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#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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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; |
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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) { |
| 161 |
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) { |
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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 int (*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; |
| 220 |
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; |
| 227 |
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': /* perturbed normal */ |
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*table++ = oputn; |
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castonly = 0; |
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break; |
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case 'N': /* unperturbed 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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bogusray() /* print out empty record */ |
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{ |
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thisray.rorg[0] = thisray.rorg[1] = thisray.rorg[2] = |
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thisray.rdir[0] = thisray.rdir[1] = thisray.rdir[2] = 0.0; |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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printvals(&thisray); |
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} |
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|
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|
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rad(org, dir, dmax) /* compute and print ray value(s) */ |
| 268 |
FVECT org, dir; |
| 269 |
double dmax; |
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{ |
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VCOPY(thisray.rorg, org); |
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VCOPY(thisray.rdir, dir); |
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thisray.rmax = dmax; |
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
| 275 |
if (castonly) { |
| 276 |
if (!localhit(&thisray, &thescene)) |
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if (thisray.ro == &Aftplane) { /* clipped */ |
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thisray.ro = NULL; |
| 279 |
thisray.rot = FHUGE; |
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} else |
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sourcehit(&thisray); |
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} else |
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rayvalue(&thisray); |
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printvals(&thisray); |
| 285 |
} |
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|
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|
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irrad(org, dir) /* compute immediate irradiance value */ |
| 289 |
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++) { |
| 294 |
thisray.rorg[i] = org[i] + dir[i]; |
| 295 |
thisray.rdir[i] = -dir[i]; |
| 296 |
} |
| 297 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
| 298 |
/* pretend we hit surface */ |
| 299 |
thisray.rot = 1.0-1e-4; |
| 300 |
thisray.rod = 1.0; |
| 301 |
VCOPY(thisray.ron, dir); |
| 302 |
for (i = 0; i < 3; i++) /* fudge factor */ |
| 303 |
thisray.rop[i] = org[i] + 1e-4*dir[i]; |
| 304 |
/* compute and print */ |
| 305 |
(*ofun[Lamb.otype].funp)(&Lamb, &thisray); |
| 306 |
printvals(&thisray); |
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} |
| 308 |
|
| 309 |
|
| 310 |
printvals(r) /* print requested ray values */ |
| 311 |
RAY *r; |
| 312 |
{ |
| 313 |
register int (**tp)(); |
| 314 |
|
| 315 |
if (ray_out[0] == NULL) |
| 316 |
return; |
| 317 |
for (tp = ray_out; *tp != NULL; tp++) |
| 318 |
(**tp)(r); |
| 319 |
if (outform == 'a') |
| 320 |
putchar('\n'); |
| 321 |
} |
| 322 |
|
| 323 |
|
| 324 |
getvec(vec, fmt, fp) /* get a vector from fp */ |
| 325 |
register FVECT vec; |
| 326 |
int fmt; |
| 327 |
FILE *fp; |
| 328 |
{ |
| 329 |
extern char *fgetword(); |
| 330 |
static float vf[3]; |
| 331 |
static double vd[3]; |
| 332 |
char buf[32]; |
| 333 |
register int i; |
| 334 |
|
| 335 |
switch (fmt) { |
| 336 |
case 'a': /* ascii */ |
| 337 |
for (i = 0; i < 3; i++) { |
| 338 |
if (fgetword(buf, sizeof(buf), fp) == NULL || |
| 339 |
!isflt(buf)) |
| 340 |
return(-1); |
| 341 |
vec[i] = atof(buf); |
| 342 |
} |
| 343 |
break; |
| 344 |
case 'f': /* binary float */ |
| 345 |
if (fread((char *)vf, sizeof(float), 3, fp) != 3) |
| 346 |
return(-1); |
| 347 |
vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2]; |
| 348 |
break; |
| 349 |
case 'd': /* binary double */ |
| 350 |
if (fread((char *)vd, sizeof(double), 3, fp) != 3) |
| 351 |
return(-1); |
| 352 |
vec[0] = vd[0]; vec[1] = vd[1]; vec[2] = vd[2]; |
| 353 |
break; |
| 354 |
default: |
| 355 |
error(CONSISTENCY, "botched input format"); |
| 356 |
} |
| 357 |
return(0); |
| 358 |
} |
| 359 |
|
| 360 |
|
| 361 |
tranotify(obj) /* record new modifier */ |
| 362 |
OBJECT obj; |
| 363 |
{ |
| 364 |
static int hitlimit = 0; |
| 365 |
register OBJREC *o = objptr(obj); |
| 366 |
register char **tralp; |
| 367 |
|
| 368 |
if (hitlimit || !ismodifier(o->otype)) |
| 369 |
return; |
| 370 |
for (tralp = tralist; *tralp != NULL; tralp++) |
| 371 |
if (!strcmp(o->oname, *tralp)) { |
| 372 |
if (traset[0] >= MAXTSET) { |
| 373 |
error(WARNING, "too many modifiers in trace list"); |
| 374 |
hitlimit++; |
| 375 |
return; /* should this be fatal? */ |
| 376 |
} |
| 377 |
insertelem(traset, obj); |
| 378 |
return; |
| 379 |
} |
| 380 |
} |
| 381 |
|
| 382 |
|
| 383 |
static |
| 384 |
ourtrace(r) /* print ray values */ |
| 385 |
RAY *r; |
| 386 |
{ |
| 387 |
register int (**tp)(); |
| 388 |
|
| 389 |
if (every_out[0] == NULL) |
| 390 |
return; |
| 391 |
if (r->ro == NULL) { |
| 392 |
if (traincl == 1) |
| 393 |
return; |
| 394 |
} else if (traincl != -1 && traincl != inset(traset, r->ro->omod)) |
| 395 |
return; |
| 396 |
tabin(r); |
| 397 |
for (tp = every_out; *tp != NULL; tp++) |
| 398 |
(**tp)(r); |
| 399 |
putchar('\n'); |
| 400 |
} |
| 401 |
|
| 402 |
|
| 403 |
static |
| 404 |
tabin(r) /* tab in appropriate amount */ |
| 405 |
RAY *r; |
| 406 |
{ |
| 407 |
register RAY *rp; |
| 408 |
|
| 409 |
for (rp = r->parent; rp != NULL; rp = rp->parent) |
| 410 |
putchar('\t'); |
| 411 |
} |
| 412 |
|
| 413 |
|
| 414 |
static |
| 415 |
oputo(r) /* print origin */ |
| 416 |
register RAY *r; |
| 417 |
{ |
| 418 |
(*putreal)(r->rorg[0]); |
| 419 |
(*putreal)(r->rorg[1]); |
| 420 |
(*putreal)(r->rorg[2]); |
| 421 |
} |
| 422 |
|
| 423 |
|
| 424 |
static |
| 425 |
oputd(r) /* print direction */ |
| 426 |
register RAY *r; |
| 427 |
{ |
| 428 |
(*putreal)(r->rdir[0]); |
| 429 |
(*putreal)(r->rdir[1]); |
| 430 |
(*putreal)(r->rdir[2]); |
| 431 |
} |
| 432 |
|
| 433 |
|
| 434 |
static |
| 435 |
oputv(r) /* print value */ |
| 436 |
register RAY *r; |
| 437 |
{ |
| 438 |
COLR cout; |
| 439 |
|
| 440 |
if (outform == 'c') { |
| 441 |
setcolr(cout, colval(r->rcol,RED), |
| 442 |
colval(r->rcol,GRN), |
| 443 |
colval(r->rcol,BLU)); |
| 444 |
fwrite((char *)cout, sizeof(cout), 1, stdout); |
| 445 |
return; |
| 446 |
} |
| 447 |
(*putreal)(colval(r->rcol,RED)); |
| 448 |
(*putreal)(colval(r->rcol,GRN)); |
| 449 |
(*putreal)(colval(r->rcol,BLU)); |
| 450 |
} |
| 451 |
|
| 452 |
|
| 453 |
static |
| 454 |
oputl(r) /* print effective distance */ |
| 455 |
register RAY *r; |
| 456 |
{ |
| 457 |
(*putreal)(r->rt); |
| 458 |
} |
| 459 |
|
| 460 |
|
| 461 |
static |
| 462 |
oputL(r) /* print single ray length */ |
| 463 |
register RAY *r; |
| 464 |
{ |
| 465 |
(*putreal)(r->rot); |
| 466 |
} |
| 467 |
|
| 468 |
|
| 469 |
static |
| 470 |
oputp(r) /* print point */ |
| 471 |
register RAY *r; |
| 472 |
{ |
| 473 |
if (r->rot < FHUGE) { |
| 474 |
(*putreal)(r->rop[0]); |
| 475 |
(*putreal)(r->rop[1]); |
| 476 |
(*putreal)(r->rop[2]); |
| 477 |
} else { |
| 478 |
(*putreal)(0.0); |
| 479 |
(*putreal)(0.0); |
| 480 |
(*putreal)(0.0); |
| 481 |
} |
| 482 |
} |
| 483 |
|
| 484 |
|
| 485 |
static |
| 486 |
oputN(r) /* print unperturbed normal */ |
| 487 |
register RAY *r; |
| 488 |
{ |
| 489 |
if (r->rot < FHUGE) { |
| 490 |
(*putreal)(r->ron[0]); |
| 491 |
(*putreal)(r->ron[1]); |
| 492 |
(*putreal)(r->ron[2]); |
| 493 |
} else { |
| 494 |
(*putreal)(0.0); |
| 495 |
(*putreal)(0.0); |
| 496 |
(*putreal)(0.0); |
| 497 |
} |
| 498 |
} |
| 499 |
|
| 500 |
|
| 501 |
static |
| 502 |
oputn(r) /* print perturbed normal */ |
| 503 |
RAY *r; |
| 504 |
{ |
| 505 |
FVECT pnorm; |
| 506 |
|
| 507 |
if (r->rot >= FHUGE) { |
| 508 |
(*putreal)(0.0); |
| 509 |
(*putreal)(0.0); |
| 510 |
(*putreal)(0.0); |
| 511 |
return; |
| 512 |
} |
| 513 |
raynormal(pnorm, r); |
| 514 |
(*putreal)(pnorm[0]); |
| 515 |
(*putreal)(pnorm[1]); |
| 516 |
(*putreal)(pnorm[2]); |
| 517 |
} |
| 518 |
|
| 519 |
|
| 520 |
static |
| 521 |
oputs(r) /* print name */ |
| 522 |
register RAY *r; |
| 523 |
{ |
| 524 |
if (r->ro != NULL) |
| 525 |
fputs(r->ro->oname, stdout); |
| 526 |
else |
| 527 |
putchar('*'); |
| 528 |
putchar('\t'); |
| 529 |
} |
| 530 |
|
| 531 |
|
| 532 |
static |
| 533 |
oputw(r) /* print weight */ |
| 534 |
register RAY *r; |
| 535 |
{ |
| 536 |
(*putreal)(r->rweight); |
| 537 |
} |
| 538 |
|
| 539 |
|
| 540 |
static |
| 541 |
oputm(r) /* print modifier */ |
| 542 |
register RAY *r; |
| 543 |
{ |
| 544 |
if (r->ro != NULL) |
| 545 |
if (r->ro->omod != OVOID) |
| 546 |
fputs(objptr(r->ro->omod)->oname, stdout); |
| 547 |
else |
| 548 |
fputs(VOIDID, stdout); |
| 549 |
else |
| 550 |
putchar('*'); |
| 551 |
putchar('\t'); |
| 552 |
} |
| 553 |
|
| 554 |
|
| 555 |
static |
| 556 |
puta(v) /* print ascii value */ |
| 557 |
double v; |
| 558 |
{ |
| 559 |
printf("%e\t", v); |
| 560 |
} |
| 561 |
|
| 562 |
|
| 563 |
static |
| 564 |
putd(v) /* print binary double */ |
| 565 |
double v; |
| 566 |
{ |
| 567 |
fwrite((char *)&v, sizeof(v), 1, stdout); |
| 568 |
} |
| 569 |
|
| 570 |
|
| 571 |
static |
| 572 |
putf(v) /* print binary float */ |
| 573 |
double v; |
| 574 |
{ |
| 575 |
float f = v; |
| 576 |
|
| 577 |
fwrite((char *)&f, sizeof(f), 1, stdout); |
| 578 |
} |
