src/rt/rtrace.c

/* Copyright (c) 1986 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  rtrace.c - program and variables for individual ray tracing.
 *
 *     6/11/86
 */

/*
 *  Input is in the form:
 *
 *      xorg    yorg    zorg    xdir    ydir    zdir
 *
 *  The direction need not be normalized.  Output is flexible.
 *  All values default to ascii representation of real
 *  numbers.  Binary representations can be selected
 *  with '-ff' for float or '-fd' for double.  By default,
 *  radiance is computed.  The '-i' option indicates that
 *  irradiance values are desired.
 */

#include  "ray.h"

#include  "otypes.h"

int  inform = 'a';                      /* input format */
int  outform = 'a';                     /* output format */
char  *outvals = "v";                   /* output specification */

int  hresolu = 0;                       /* horizontal (scan) size */
int  vresolu = 0;                       /* vertical resolution */

double  dstrsrc = 0.0;                  /* square source distribution */
double  shadthresh = .01;               /* shadow threshold */

int  maxdepth = 6;                      /* maximum recursion depth */
double  minweight = 4e-3;               /* minimum ray weight */

COLOR  ambval = BLKCOLOR;               /* ambient value */
double  ambacc = 0.2;                   /* ambient accuracy */
int  ambres = 128;                      /* ambient resolution */
int  ambdiv = 128;                      /* ambient divisions */
int  ambssamp = 0;                      /* ambient super-samples */
int  ambounce = 0;                      /* ambient bounces */
char  *amblist[128];                    /* ambient include/exclude list */
int  ambincl = -1;                      /* include == 1, exclude == 0 */

static RAY  thisray;                    /* for our convenience */

extern int  oputo(), oputd(), oputv(), oputl(), 
                oputp(), oputn(), oputs(), oputw(), oputm();

static int  (*ray_out[10])(), (*every_out[10])();

extern int  puta(), putf(), putd();

static int  (*putreal)();


quit(code)                      /* quit program */
int  code;
{
        exit(code);
}


rtrace(fname)                           /* trace rays from file */
char  *fname;
{
        long  vcount = hresolu>1 ? hresolu*vresolu : vresolu;
        long  nextflush = hresolu;
        FILE  *fp;
        FVECT  orig, direc;
                                        /* set up input */
        if (fname == NULL)
                fp = stdin;
        else if ((fp = fopen(fname, "r")) == NULL) {
                sprintf(errmsg, "cannot open input file \"%s\"", fname);
                error(SYSTEM, errmsg);
        }
                                        /* set up output */
        setoutput(outvals);
        switch (outform) {
        case 'a': putreal = puta; break;
        case 'f': putreal = putf; break;
        case 'd': putreal = putd; break;
        }
                                        /* process file */
        while (getvec(orig, inform, fp) == 0 &&
                        getvec(direc, inform, fp) == 0) {

                if (normalize(direc) == 0.0)
                        error(USER, "zero direction vector");
                                                        /* compute and print */
                if (outvals[0] == 'i')
                        irrad(orig, direc);
                else
                        radiance(orig, direc);
                                                        /* flush if requested */
                if (--nextflush == 0) {
                        fflush(stdout);
                        nextflush = hresolu;
                }
                if (ferror(stdout))
                        error(SYSTEM, "write error");
                if (--vcount == 0)                      /* check for end */
                        break;
        }
        if (vcount > 0)
                error(USER, "read error");
        fclose(fp);
}


setoutput(vs)                           /* set up output tables */
register char  *vs;
{
        extern int  ourtrace(), (*trace)();
        register int (**table)() = ray_out;

        while (*vs)
                switch (*vs++) {
                case 't':                               /* trace */
                        *table = NULL;
                        table = every_out;
                        trace = ourtrace;
                        break;
                case 'o':                               /* origin */
                        *table++ = oputo;
                        break;
                case 'd':                               /* direction */
                        *table++ = oputd;
                        break;
                case 'v':                               /* value */
                        *table++ = oputv;
                        break;
                case 'l':                               /* length */
                        *table++ = oputl;
                        break;
                case 'p':                               /* point */
                        *table++ = oputp;
                        break;
                case 'n':                               /* normal */
                        *table++ = oputn;
                        break;
                case 's':                               /* surface */
                        *table++ = oputs;
                        break;
                case 'w':                               /* weight */
                        *table++ = oputw;
                        break;
                case 'm':                               /* modifier */
                        *table++ = oputm;
                        break;
                }
        *table = NULL;
}


radiance(org, dir)              /* compute radiance value */
FVECT  org, dir;
{
        register int  (**tp)();

        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
        rayvalue(&thisray);

        if (ray_out[0] == NULL)
                return;
        for (tp = ray_out; *tp != NULL; tp++)
                (**tp)(&thisray);
        if (outform == 'a')
                putchar('\n');
}


irrad(org, dir)                 /* compute irradiance value */
FVECT  org, dir;
{
        static double  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
        static OBJREC  Lamb = {
                OVOID, MAT_PLASTIC, "Lambertian",
                {0, 5, NULL, Lambfa}, NULL, -1,
        };
        register int  i;

        for (i = 0; i < 3; i++) {
                thisray.rorg[i] = org[i] + dir[i];
                thisray.rdir[i] = -dir[i];
        }
        rayorigin(&thisray, NULL, PRIMARY, 1.0);
                                        /* pretend we hit surface */
        thisray.rot = 1.0;
        thisray.rod = 1.0;
        VCOPY(thisray.ron, dir);
        for (i = 0; i < 3; i++)         /* fudge factor */
                thisray.rop[i] = org[i] + 1e-4*dir[i];
                                        /* compute and print */
        (*ofun[Lamb.otype].funp)(&Lamb, &thisray);
        oputv(&thisray);
        if (outform == 'a')
                putchar('\n');
}


getvec(vec, fmt, fp)            /* get a vector from fp */
register FVECT  vec;
int  fmt;
FILE  *fp;
{
        static float  vf[3];

        switch (fmt) {
        case 'a':                                       /* ascii */
                if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
                        return(-1);
                break;
        case 'f':                                       /* binary float */
                if (fread(vf, sizeof(float), 3, fp) != 3)
                        return(-1);
                vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
                break;
        case 'd':                                       /* binary double */
                if (fread(vec, sizeof(double), 3, fp) != 3)
                        return(-1);
                break;
        }
        return(0);
}


static
ourtrace(r)                             /* print ray values */
RAY  *r;
{
        register int  (**tp)();

        if (every_out[0] == NULL)
                return;
        tabin(r);
        for (tp = every_out; *tp != NULL; tp++)
                (**tp)(r);
        putchar('\n');
}


static
tabin(r)                                /* tab in appropriate amount */
RAY  *r;
{
        register RAY  *rp;

        for (rp = r->parent; rp != NULL; rp = rp->parent)
                putchar('\t');
}


static
oputo(r)                                /* print origin */
register RAY  *r;
{
        (*putreal)(r->rorg[0]);
        (*putreal)(r->rorg[1]);
        (*putreal)(r->rorg[2]);
}


static
oputd(r)                                /* print direction */
register RAY  *r;
{
        (*putreal)(r->rdir[0]);
        (*putreal)(r->rdir[1]);
        (*putreal)(r->rdir[2]);
}


static
oputv(r)                                /* print value */
register RAY  *r;
{
        (*putreal)(colval(r->rcol,RED));
        (*putreal)(colval(r->rcol,GRN));
        (*putreal)(colval(r->rcol,BLU));
}


static
oputl(r)                                /* print length */
register RAY  *r;
{
        if (r->rot < FHUGE)
                (*putreal)(r->rot);
        else
                (*putreal)(0.0);
}


static
oputp(r)                                /* print point */
register RAY  *r;
{
        if (r->rot < FHUGE) {
                (*putreal)(r->rop[0]);
                (*putreal)(r->rop[1]);
                (*putreal)(r->rop[2]);
        } else {
                (*putreal)(0.0);
                (*putreal)(0.0);
                (*putreal)(0.0);
        }
}


static
oputn(r)                                /* print normal */
register RAY  *r;
{
        if (r->rot < FHUGE) {
                (*putreal)(r->ron[0]);
                (*putreal)(r->ron[1]);
                (*putreal)(r->ron[2]);
        } else {
                (*putreal)(0.0);
                (*putreal)(0.0);
                (*putreal)(0.0);
        }
}


static
oputs(r)                                /* print name */
register RAY  *r;
{
        if (r->ro != NULL)
                fputs(r->ro->oname, stdout);
        else
                putchar('*');
        putchar('\t');
}


static
oputw(r)                                /* print weight */
register RAY  *r;
{
        (*putreal)(r->rweight);
}


static
oputm(r)                                /* print modifier */
register RAY  *r;
{
        if (r->ro != NULL)
                fputs(objptr(r->ro->omod)->oname, stdout);
        else
                putchar('*');
        putchar('\t');
}


static
puta(v)                         /* print ascii value */
double  v;
{
        printf("%e\t", v);
}


static
putd(v)                         /* print binary double */
double  v;
{
        fwrite(&v, sizeof(v), 1, stdout);
}


static
putf(v)                         /* print binary float */
double  v;
{
        float f = v;

        fwrite(&f, sizeof(f), 1, stdout);
}
Revision:	1.3
Committed:	Wed Jun 7 08:35:23 1989 UTC (34 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+1 -0 lines
Log Message:	Efficient approximation to direct component with many sources Glow type changed Spot type eliminated
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* rtrace.c - program and variables for individual ray tracing.
9			*
10			* 6/11/86
11			*/
12
13			/*
14			* Input is in the form:
15			*
16			* xorg yorg zorg xdir ydir zdir
17			*
18			* The direction need not be normalized. Output is flexible.
19			* All values default to ascii representation of real
20			* numbers. Binary representations can be selected
21			* with '-ff' for float or '-fd' for double. By default,
22			* radiance is computed. The '-i' option indicates that
23			* irradiance values are desired.
24			*/
25
26			#include "ray.h"
27
28			#include "otypes.h"
29
30			int inform = 'a'; /* input format */
31			int outform = 'a'; /* output format */
32			char outvals = "v"; / output specification */
33
34			int hresolu = 0; /* horizontal (scan) size */
35			int vresolu = 0; /* vertical resolution */
36
37			double dstrsrc = 0.0; /* square source distribution */
38	greg	1.3	double shadthresh = .01; /* shadow threshold */
39	greg	1.1
40			int maxdepth = 6; /* maximum recursion depth */
41			double minweight = 4e-3; /* minimum ray weight */
42
43			COLOR ambval = BLKCOLOR; /* ambient value */
44			double ambacc = 0.2; /* ambient accuracy */
45			int ambres = 128; /* ambient resolution */
46			int ambdiv = 128; /* ambient divisions */
47			int ambssamp = 0; /* ambient super-samples */
48			int ambounce = 0; /* ambient bounces */
49			char amblist[128]; / ambient include/exclude list */
50			int ambincl = -1; /* include == 1, exclude == 0 */
51
52			static RAY thisray; /* for our convenience */
53
54			extern int oputo(), oputd(), oputv(), oputl(),
55			oputp(), oputn(), oputs(), oputw(), oputm();
56
57			static int (ray_out[10])(), (every_out[10])();
58
59			extern int puta(), putf(), putd();
60
61			static int (*putreal)();
62
63
64			quit(code) /* quit program */
65			int code;
66			{
67			exit(code);
68			}
69
70
71			rtrace(fname) /* trace rays from file */
72			char *fname;
73			{
74			long vcount = hresolu>1 ? hresolu*vresolu : vresolu;
75			long nextflush = hresolu;
76			FILE *fp;
77	greg	1.2	FVECT orig, direc;
78	greg	1.1	/* set up input */
79			if (fname == NULL)
80			fp = stdin;
81			else if ((fp = fopen(fname, "r")) == NULL) {
82			sprintf(errmsg, "cannot open input file \"%s\"", fname);
83			error(SYSTEM, errmsg);
84			}
85			/* set up output */
86			setoutput(outvals);
87			switch (outform) {
88			case 'a': putreal = puta; break;
89			case 'f': putreal = putf; break;
90			case 'd': putreal = putd; break;
91			}
92			/* process file */
93			while (getvec(orig, inform, fp) == 0 &&
94			getvec(direc, inform, fp) == 0) {
95
96			if (normalize(direc) == 0.0)
97			error(USER, "zero direction vector");
98			/* compute and print */
99			if (outvals[0] == 'i')
100			irrad(orig, direc);
101			else
102			radiance(orig, direc);
103			/* flush if requested */
104			if (--nextflush == 0) {
105			fflush(stdout);
106			nextflush = hresolu;
107			}
108			if (ferror(stdout))
109			error(SYSTEM, "write error");
110			if (--vcount == 0) /* check for end */
111			break;
112			}
113			if (vcount > 0)
114			error(USER, "read error");
115			fclose(fp);
116			}
117
118
119			setoutput(vs) /* set up output tables */
120			register char *vs;
121			{
122			extern int ourtrace(), (*trace)();
123			register int (**table)() = ray_out;
124
125			while (*vs)
126			switch (*vs++) {
127			case 't': /* trace */
128			*table = NULL;
129			table = every_out;
130			trace = ourtrace;
131			break;
132			case 'o': /* origin */
133			*table++ = oputo;
134			break;
135			case 'd': /* direction */
136			*table++ = oputd;
137			break;
138			case 'v': /* value */
139			*table++ = oputv;
140			break;
141			case 'l': /* length */
142			*table++ = oputl;
143			break;
144			case 'p': /* point */
145			*table++ = oputp;
146			break;
147			case 'n': /* normal */
148			*table++ = oputn;
149			break;
150			case 's': /* surface */
151			*table++ = oputs;
152			break;
153			case 'w': /* weight */
154			*table++ = oputw;
155			break;
156			case 'm': /* modifier */
157			*table++ = oputm;
158			break;
159			}
160			*table = NULL;
161			}
162
163
164			radiance(org, dir) /* compute radiance value */
165			FVECT org, dir;
166			{
167			register int (**tp)();
168
169			VCOPY(thisray.rorg, org);
170			VCOPY(thisray.rdir, dir);
171			rayorigin(&thisray, NULL, PRIMARY, 1.0);
172			rayvalue(&thisray);
173
174			if (ray_out[0] == NULL)
175			return;
176			for (tp = ray_out; *tp != NULL; tp++)
177			(**tp)(&thisray);
178			if (outform == 'a')
179			putchar('\n');
180			}
181
182
183			irrad(org, dir) /* compute irradiance value */
184			FVECT org, dir;
185			{
186			static double Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
187			static OBJREC Lamb = {
188			OVOID, MAT_PLASTIC, "Lambertian",
189			{0, 5, NULL, Lambfa}, NULL, -1,
190			};
191			register int i;
192
193			for (i = 0; i < 3; i++) {
194			thisray.rorg[i] = org[i] + dir[i];
195			thisray.rdir[i] = -dir[i];
196			}
197			rayorigin(&thisray, NULL, PRIMARY, 1.0);
198			/* pretend we hit surface */
199			thisray.rot = 1.0;
200			thisray.rod = 1.0;
201			VCOPY(thisray.ron, dir);
202			for (i = 0; i < 3; i++) /* fudge factor */
203			thisray.rop[i] = org[i] + 1e-4*dir[i];
204			/* compute and print */
205			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
206			oputv(&thisray);
207			if (outform == 'a')
208			putchar('\n');
209			}
210
211
212			getvec(vec, fmt, fp) /* get a vector from fp */
213			register FVECT vec;
214			int fmt;
215			FILE *fp;
216			{
217			static float vf[3];
218
219			switch (fmt) {
220			case 'a': /* ascii */
221			if (fscanf(fp, "%lf %lf %lf", vec, vec+1, vec+2) != 3)
222			return(-1);
223			break;
224			case 'f': /* binary float */
225			if (fread(vf, sizeof(float), 3, fp) != 3)
226			return(-1);
227			vec[0] = vf[0]; vec[1] = vf[1]; vec[2] = vf[2];
228			break;
229			case 'd': /* binary double */
230			if (fread(vec, sizeof(double), 3, fp) != 3)
231			return(-1);
232			break;
233			}
234			return(0);
235			}
236
237
238			static
239			ourtrace(r) /* print ray values */
240			RAY *r;
241			{
242			register int (**tp)();
243
244			if (every_out[0] == NULL)
245			return;
246			tabin(r);
247			for (tp = every_out; *tp != NULL; tp++)
248			(**tp)(r);
249			putchar('\n');
250			}
251
252
253			static
254			tabin(r) /* tab in appropriate amount */
255			RAY *r;
256			{
257			register RAY *rp;
258
259			for (rp = r->parent; rp != NULL; rp = rp->parent)
260			putchar('\t');
261			}
262
263
264			static
265			oputo(r) /* print origin */
266			register RAY *r;
267			{
268			(*putreal)(r->rorg[0]);
269			(*putreal)(r->rorg[1]);
270			(*putreal)(r->rorg[2]);
271			}
272
273
274			static
275			oputd(r) /* print direction */
276			register RAY *r;
277			{
278			(*putreal)(r->rdir[0]);
279			(*putreal)(r->rdir[1]);
280			(*putreal)(r->rdir[2]);
281			}
282
283
284			static
285			oputv(r) /* print value */
286			register RAY *r;
287			{
288			(*putreal)(colval(r->rcol,RED));
289			(*putreal)(colval(r->rcol,GRN));
290			(*putreal)(colval(r->rcol,BLU));
291			}
292
293
294			static
295			oputl(r) /* print length */
296			register RAY *r;
297			{
298			if (r->rot < FHUGE)
299			(*putreal)(r->rot);
300			else
301			(*putreal)(0.0);
302			}
303
304
305			static
306			oputp(r) /* print point */
307			register RAY *r;
308			{
309			if (r->rot < FHUGE) {
310			(*putreal)(r->rop[0]);
311			(*putreal)(r->rop[1]);
312			(*putreal)(r->rop[2]);
313			} else {
314			(*putreal)(0.0);
315			(*putreal)(0.0);
316			(*putreal)(0.0);
317			}
318			}
319
320
321			static
322			oputn(r) /* print normal */
323			register RAY *r;
324			{
325			if (r->rot < FHUGE) {
326			(*putreal)(r->ron[0]);
327			(*putreal)(r->ron[1]);
328			(*putreal)(r->ron[2]);
329			} else {
330			(*putreal)(0.0);
331			(*putreal)(0.0);
332			(*putreal)(0.0);
333			}
334			}
335
336
337			static
338			oputs(r) /* print name */
339			register RAY *r;
340			{
341			if (r->ro != NULL)
342			fputs(r->ro->oname, stdout);
343			else
344			putchar('*');
345			putchar('\t');
346			}
347
348
349			static
350			oputw(r) /* print weight */
351			register RAY *r;
352			{
353			(*putreal)(r->rweight);
354			}
355
356
357			static
358			oputm(r) /* print modifier */
359			register RAY *r;
360			{
361			if (r->ro != NULL)
362			fputs(objptr(r->ro->omod)->oname, stdout);
363			else
364			putchar('*');
365			putchar('\t');
366			}
367
368
369			static
370			puta(v) /* print ascii value */
371			double v;
372			{
373			printf("%e\t", v);
374			}
375
376
377			static
378			putd(v) /* print binary double */
379			double v;
380			{
381			fwrite(&v, sizeof(v), 1, stdout);
382			}
383
384
385			static
386			putf(v) /* print binary float */
387			double v;
388			{
389			float f = v;
390
391			fwrite(&f, sizeof(f), 1, stdout);
392			}