src/gen/mkillum2.c

/* Copyright (c) 1991 Regents of the University of California */

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

/*
 * Routines to do the actual calcultion and output for mkillum
 */

#include  "mkillum.h"

#include  "face.h"

#include  "cone.h"

#include  "random.h"


printobj(mod, obj)              /* print out an object */
char  *mod;
register OBJREC  *obj;
{
        register int  i;

        printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname);
        printf("\n%d", obj->oargs.nsargs);
        for (i = 0; i < obj->oargs.nsargs; i++)
                printf(" %s", obj->oargs.sarg[i]);
#ifdef  IARGS
        printf("\n%d", obj->oargs.niargs);
        for (i = 0; i < obj->oargs.niargs; i++)
                printf(" %d", obj->oargs.iarg[i]);
#else
        printf("\n0");
#endif
        printf("\n%d", obj->oargs.nfargs);
        for (i = 0; i < obj->oargs.nfargs; i++) {
                if (i%3 == 0)
                        putchar('\n');
                printf(" %18.12g", obj->oargs.farg[i]);
        }
        putchar('\n');
}


o_default(ob, il, rt, nm)       /* default illum action */
OBJREC  *ob;
struct illum_args  *il;
struct rtproc  *rt;
char  *nm;
{
        sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"",
                        nm, ofun[ob->otype].funame, ob->oname);
        error(WARNING, errmsg);
        if (!(il->flags & IL_LIGHT))
                printobj(il->altname, ob);
}


o_face(ob, il, rt, nm)          /* make an illum face */
OBJREC  *ob;
struct illum_args  *il;
struct rtproc  *rt;
char  *nm;
{
#define MAXMISS         (5*n*il->nsamps)
        int  dim[4];
        int  n, nalt, nazi;
        float  *distarr;
        double  r1, r2;
        FVECT  dn, pos, dir;
        FVECT  u, v;
        double  ur[2], vr[2];
        int  nmisses;
        register FACE  *fa;
        register int  i, j;
                                /* get/check arguments */
        fa = getface(ob);
        if (fa->area == 0.0) {
                freeface(ob);
                o_default(ob, il, rt, nm);
                return;
        }
                                /* set up sampling */
        n = PI * il->sampdens;
        nalt = sqrt(n/PI) + .5;
        nazi = PI*nalt + .5;
        n = nalt*nazi;
        distarr = (float *)calloc(n, 3*sizeof(float));
        if (distarr == NULL)
                error(SYSTEM, "out of memory in o_face");
        mkaxes(u, v, fa->norm);
        ur[0] = vr[0] = FHUGE;
        ur[1] = vr[1] = -FHUGE;
        for (i = 0; i < fa->nv; i++) {
                r1 = DOT(VERTEX(fa,i),u);
                if (r1 < ur[0]) ur[0] = r1;
                if (r1 > ur[1]) ur[1] = r1;
                r2 = DOT(VERTEX(fa,i),v);
                if (r2 < vr[0]) vr[0] = r2;
                if (r2 > vr[1]) vr[1] = r2;
        }
        dim[0] = random();
                                /* sample polygon */
        nmisses = 0;
        for (dim[1] = 0; dim[1] < nalt; dim[1]++)
            for (dim[2] = 0; dim[2] < nazi; dim[2]++)
                for (i = 0; i < il->nsamps; i++) {
                                        /* random direction */
                    dim[3] = 1;
                    r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
                    dim[3] = 2;
                    r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
                    flatdir(dn, r1, r2);
                    for (j = 0; j < 3; j++)
                        dir[j] = dn[0]*u[j] + dn[1]*v[j] - dn[2]*fa->norm[j];
                                        /* random location */
                    do {
                        dim[3] = 3;
                        r1 = ur[0] +
                                (ur[1]-ur[0])*urand(urind(ilhash(dim,4),i));
                        dim[3] = 4;
                        r2 = vr[0] +
                                (vr[1]-vr[0])*urand(urind(ilhash(dim,4),i));
                        for (j = 0; j < 3; j++)
                            org[j] = r1*u[j] + r2*v[j]
                                        + fa->offset*fa->norm[j];
                    } while (!inface(org, fa) && nmisses++ < MAXMISS);
                    if (nmisses > MAXMISS) {
                        objerror(ob, WARNING, "bad aspect");
                        rt->nrays = 0;
                        freeface(ob);
                        free((char *)distarr);
                        o_default(ob, il, rt, nm);
                        return;
                    }
                    for (j = 0; j < 3; j++)
                        org[j] += .001*fa->norm[j];
                                        /* send sample */
                    raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
                }
        rayflush(rt);
                                /* write out the distribution */
        flatdist(distarr, nalt, nazi, il, ob);
                                /* clean up */
        freeface(ob);
        free((char *)distarr);
#undef MAXMISS
}


o_sphere(ob, il, rt, nm)        /* make an illum sphere */
register OBJREC  *ob;
struct illum_args  *il;
struct rtproc  *rt;
char  *nm;
{
        int  dim[4];
        int  n, nalt, nazi;
        float  *distarr;
        double  r1, r2;
        FVECT  pos, dir;
        FVECT  u, v;
        register int  i, j;
                                /* check arguments */
        if (ob->oargs.nfargs != 4)
                objerror(ob, USER, "bad # of arguments");
                                /* set up sampling */
        n = 4.*PI * il->sampdens;
        nalt = sqrt(n/PI) + .5;
        nazi = PI*nalt + .5;
        n = nalt*nazi;
        distarr = (float *)calloc(n, 3*sizeof(float));
        if (distarr == NULL)
                error(SYSTEM, "out of memory in o_sphere");
        dim[0] = random();
                                /* sample sphere */
        for (dim[1] = 0; dim[1] < nalt; dim[1]++)
            for (dim[2] = 0; dim[2] < nazi; dim[2]++)
                for (i = 0; i < il->nsamps; i++) {
                                        /* random direction */
                    dim[3] = 1;
                    r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
                    dim[3] = 2;
                    r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
                    rounddir(dir, r1, r2);
                                        /* random location */
                    mkaxes(u, v, dir);          /* yuck! */
                    dim[3] = 3;
                    r1 = sqrt(urand(urind(ilhash(dim,4),i)));
                    dim[3] = 4;
                    r2 = 2.*PI*urand(urind(ilhash(dim,4),i));
                    for (j = 0; j < 3; j++)
                        org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] *
                                        ( r1*cos(r2)*u[j] + r1*sin(r2)*v[j]
                                                - sqrt(1.01-r1*r1)*dir[j] );

                                        /* send sample */
                    raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
                }
        rayflush(rt);
                                /* write out the distribution */
        rounddist(distarr, nalt, nazi, il, ob);
                                /* clean up */
        free((char *)distarr);
}


o_ring(ob, il, rt, nm)          /* make an illum ring */
OBJREC  *ob;
struct illum_args  *il;
struct rtproc  *rt;
char  *nm;
{
        int  dim[4];
        int  n, nalt, nazi;
        float  *distarr;
        double  r1, r2;
        FVECT  dn, pos, dir;
        FVECT  u, v;
        register CONE  *co;
        register int  i, j;
                                /* get/check arguments */
        co = getcone(ob, 0);
                                /* set up sampling */
        n = PI * il->sampdens;
        nalt = sqrt(n/PI) + .5;
        nazi = PI*nalt + .5;
        n = nalt*nazi;
        distarr = (float *)calloc(n, 3*sizeof(float));
        if (distarr == NULL)
                error(SYSTEM, "out of memory in o_ring");
        mkaxes(u, v, co->ad);
        dim[0] = random();
                                /* sample disk */
        for (dim[1] = 0; dim[1] < nalt; dim[1]++)
            for (dim[2] = 0; dim[2] < nazi; dim[2]++)
                for (i = 0; i < il->nsamps; i++) {
                                        /* random direction */
                    dim[3] = 1;
                    r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
                    dim[3] = 2;
                    r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
                    flatdir(dn, r1, r2);
                    for (j = 0; j < 3; j++)
                        dir[j] = dn[0]*u[j] + dn[1]*v[j] - dn[2]*co->ad[j];
                                        /* random location */
                    dim[3] = 3;
                    r1 = sqrt(CO_R0(co)*CO_R0(co) +
                                urand(urind(ilhash(dim,4),i))*
                                (CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co)));
                    dim[3] = 4;
                    r2 = 2.*PI*urand(urind(ilhash(dim,4),i));
                    for (j = 0; j < 3; j++)
                        org[j] = CO_P0(co)[j] +
                                        r1*cos(r2)*u[j] + r1*sin(r2)*v[j]
                                        + .001*co->ad[j];

                                        /* send sample */
                    raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
                }
        rayflush(rt);
                                /* write out the distribution */
        flatdist(distarr, nalt, nazi, il, ob);
                                /* clean up */
        freecone(ob);
        free((char *)distarr);
}


raysamp(res, org, dir, rt)      /* compute a ray sample */
float  res[3];
FVECT  org, dir;
register struct rtproc  *rt;
{
        register float  *fp;

        if (rt->nrays == rt->bsiz)
                rayflush(rt);
        rt->dest[rt->nrays] = res;
        fp = rt->buf + 6*rt->nrays++;
        *fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2];
        *fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2];
}


rayflush(rt)                    /* flush buffered rays */
register struct rtproc  *rt;
{
        register int  i;

        if (rt->nrays <= 0)
                return;
        i = 6*rt->nrays + 3;
        rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.;
        if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf,
                        3*sizeof(float)*rt->nrays,
                        6*sizeof(float)*(rt->nrays+1)) <
                        3*sizeof(float)*rt->nrays )
                error(SYSTEM, "error reading from rtrace process");
        i = rt->nrays;
        while (i--) {
                rt->dest[i][0] += rt->buf[3*i];
                rt->dest[i][1] += rt->buf[3*i+1];
                rt->dest[i][2] += rt->buf[3*i+2];
        }
        rt->nrays = 0;
}
Revision:	1.3
Committed:	Wed Jul 24 13:32:05 1991 UTC (34 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+138 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1991 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Routines to do the actual calcultion and output for mkillum
9			*/
10
11			#include "mkillum.h"
12
13			#include "face.h"
14
15			#include "cone.h"
16
17	greg	1.2	#include "random.h"
18	greg	1.1
19	greg	1.2
20	greg	1.1	printobj(mod, obj) /* print out an object */
21			char *mod;
22			register OBJREC *obj;
23			{
24			register int i;
25
26			printf("\n%s %s %s", mod, ofun[obj->otype].funame, obj->oname);
27			printf("\n%d", obj->oargs.nsargs);
28			for (i = 0; i < obj->oargs.nsargs; i++)
29			printf(" %s", obj->oargs.sarg[i]);
30			#ifdef IARGS
31			printf("\n%d", obj->oargs.niargs);
32			for (i = 0; i < obj->oargs.niargs; i++)
33			printf(" %d", obj->oargs.iarg[i]);
34			#else
35			printf("\n0");
36			#endif
37			printf("\n%d", obj->oargs.nfargs);
38			for (i = 0; i < obj->oargs.nfargs; i++) {
39			if (i%3 == 0)
40			putchar('\n');
41			printf(" %18.12g", obj->oargs.farg[i]);
42			}
43			putchar('\n');
44			}
45
46
47	greg	1.2	o_default(ob, il, rt, nm) /* default illum action */
48	greg	1.1	OBJREC *ob;
49			struct illum_args *il;
50			struct rtproc *rt;
51	greg	1.2	char *nm;
52	greg	1.1	{
53	greg	1.2	sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"",
54			nm, ofun[ob->otype].funame, ob->oname);
55			error(WARNING, errmsg);
56			if (!(il->flags & IL_LIGHT))
57			printobj(il->altname, ob);
58			}
59
60
61			o_face(ob, il, rt, nm) /* make an illum face */
62			OBJREC *ob;
63			struct illum_args *il;
64			struct rtproc *rt;
65			char *nm;
66			{
67	greg	1.3	#define MAXMISS (5nil->nsamps)
68			int dim[4];
69			int n, nalt, nazi;
70			float *distarr;
71			double r1, r2;
72			FVECT dn, pos, dir;
73			FVECT u, v;
74			double ur[2], vr[2];
75			int nmisses;
76			register FACE *fa;
77			register int i, j;
78			/* get/check arguments */
79			fa = getface(ob);
80			if (fa->area == 0.0) {
81			freeface(ob);
82			o_default(ob, il, rt, nm);
83			return;
84			}
85			/* set up sampling */
86			n = PI * il->sampdens;
87			nalt = sqrt(n/PI) + .5;
88			nazi = PI*nalt + .5;
89			n = nalt*nazi;
90			distarr = (float )calloc(n, 3sizeof(float));
91			if (distarr == NULL)
92			error(SYSTEM, "out of memory in o_face");
93			mkaxes(u, v, fa->norm);
94			ur[0] = vr[0] = FHUGE;
95			ur[1] = vr[1] = -FHUGE;
96			for (i = 0; i < fa->nv; i++) {
97			r1 = DOT(VERTEX(fa,i),u);
98			if (r1 < ur[0]) ur[0] = r1;
99			if (r1 > ur[1]) ur[1] = r1;
100			r2 = DOT(VERTEX(fa,i),v);
101			if (r2 < vr[0]) vr[0] = r2;
102			if (r2 > vr[1]) vr[1] = r2;
103			}
104			dim[0] = random();
105			/* sample polygon */
106			nmisses = 0;
107			for (dim[1] = 0; dim[1] < nalt; dim[1]++)
108			for (dim[2] = 0; dim[2] < nazi; dim[2]++)
109			for (i = 0; i < il->nsamps; i++) {
110			/* random direction */
111			dim[3] = 1;
112			r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
113			dim[3] = 2;
114			r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
115			flatdir(dn, r1, r2);
116			for (j = 0; j < 3; j++)
117			dir[j] = dn[0]u[j] + dn[1]v[j] - dn[2]*fa->norm[j];
118			/* random location */
119			do {
120			dim[3] = 3;
121			r1 = ur[0] +
122			(ur[1]-ur[0])*urand(urind(ilhash(dim,4),i));
123			dim[3] = 4;
124			r2 = vr[0] +
125			(vr[1]-vr[0])*urand(urind(ilhash(dim,4),i));
126			for (j = 0; j < 3; j++)
127			org[j] = r1u[j] + r2v[j]
128			+ fa->offset*fa->norm[j];
129			} while (!inface(org, fa) && nmisses++ < MAXMISS);
130			if (nmisses > MAXMISS) {
131			objerror(ob, WARNING, "bad aspect");
132			rt->nrays = 0;
133			freeface(ob);
134			free((char *)distarr);
135			o_default(ob, il, rt, nm);
136			return;
137			}
138			for (j = 0; j < 3; j++)
139			org[j] += .001*fa->norm[j];
140			/* send sample */
141			raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
142			}
143			rayflush(rt);
144			/* write out the distribution */
145			flatdist(distarr, nalt, nazi, il, ob);
146			/* clean up */
147			freeface(ob);
148			free((char *)distarr);
149			#undef MAXMISS
150	greg	1.2	}
151
152
153			o_sphere(ob, il, rt, nm) /* make an illum sphere */
154	greg	1.3	register OBJREC *ob;
155	greg	1.2	struct illum_args *il;
156			struct rtproc *rt;
157			char *nm;
158			{
159			int dim[4];
160			int n, nalt, nazi;
161			float *distarr;
162			double r1, r2;
163			FVECT pos, dir;
164			FVECT u, v;
165			register int i, j;
166			/* check arguments */
167			if (ob->oargs.nfargs != 4)
168			objerror(ob, USER, "bad # of arguments");
169			/* set up sampling */
170			n = 4.PI il->sampdens;
171			nalt = sqrt(n/PI) + .5;
172			nazi = PI*nalt + .5;
173			n = nalt*nazi;
174			distarr = (float )calloc(n, 3sizeof(float));
175			if (distarr == NULL)
176			error(SYSTEM, "out of memory in o_sphere");
177			dim[0] = random();
178			/* sample sphere */
179			for (dim[1] = 0; dim[1] < nalt; dim[1]++)
180			for (dim[2] = 0; dim[2] < nazi; dim[2]++)
181			for (i = 0; i < il->nsamps; i++) {
182			/* random direction */
183			dim[3] = 1;
184			r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
185			dim[3] = 2;
186			r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
187			rounddir(dir, r1, r2);
188			/* random location */
189			mkaxes(u, v, dir); /* yuck! */
190			dim[3] = 3;
191			r1 = sqrt(urand(urind(ilhash(dim,4),i)));
192			dim[3] = 4;
193			r2 = 2.PIurand(urind(ilhash(dim,4),i));
194			for (j = 0; j < 3; j++)
195			org[j] = obj->oargs.farg[j] + obj->oargs.farg[3] *
196			( r1cos(r2)u[j] + r1sin(r2)v[j]
197			- sqrt(1.01-r1r1)dir[j] );
198
199			/* send sample */
200			raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
201			}
202			rayflush(rt);
203	greg	1.3	/* write out the distribution */
204	greg	1.2	rounddist(distarr, nalt, nazi, il, ob);
205			/* clean up */
206			free((char *)distarr);
207			}
208
209
210			o_ring(ob, il, rt, nm) /* make an illum ring */
211			OBJREC *ob;
212			struct illum_args *il;
213			struct rtproc *rt;
214			char *nm;
215			{
216	greg	1.3	int dim[4];
217			int n, nalt, nazi;
218			float *distarr;
219			double r1, r2;
220			FVECT dn, pos, dir;
221			FVECT u, v;
222			register CONE *co;
223			register int i, j;
224			/* get/check arguments */
225			co = getcone(ob, 0);
226			/* set up sampling */
227			n = PI * il->sampdens;
228			nalt = sqrt(n/PI) + .5;
229			nazi = PI*nalt + .5;
230			n = nalt*nazi;
231			distarr = (float )calloc(n, 3sizeof(float));
232			if (distarr == NULL)
233			error(SYSTEM, "out of memory in o_ring");
234			mkaxes(u, v, co->ad);
235			dim[0] = random();
236			/* sample disk */
237			for (dim[1] = 0; dim[1] < nalt; dim[1]++)
238			for (dim[2] = 0; dim[2] < nazi; dim[2]++)
239			for (i = 0; i < il->nsamps; i++) {
240			/* random direction */
241			dim[3] = 1;
242			r1 = (dim[1]+urand(urind(ilhash(dim,4),i)))/nalt;
243			dim[3] = 2;
244			r2 = (dim[2]+urand(urind(ilhash(dim,4),i)))/nalt;
245			flatdir(dn, r1, r2);
246			for (j = 0; j < 3; j++)
247			dir[j] = dn[0]u[j] + dn[1]v[j] - dn[2]*co->ad[j];
248			/* random location */
249			dim[3] = 3;
250			r1 = sqrt(CO_R0(co)*CO_R0(co) +
251			urand(urind(ilhash(dim,4),i))*
252			(CO_R1(co)CO_R1(co) - CO_R0(co)CO_R0(co)));
253			dim[3] = 4;
254			r2 = 2.PIurand(urind(ilhash(dim,4),i));
255			for (j = 0; j < 3; j++)
256			org[j] = CO_P0(co)[j] +
257			r1cos(r2)u[j] + r1sin(r2)v[j]
258			+ .001*co->ad[j];
259
260			/* send sample */
261			raysamp(distarr+dim[1]*nazi+dim[2], org, dir, rt);
262			}
263			rayflush(rt);
264			/* write out the distribution */
265			flatdist(distarr, nalt, nazi, il, ob);
266			/* clean up */
267			freecone(ob);
268			free((char *)distarr);
269	greg	1.2	}
270
271
272			raysamp(res, org, dir, rt) /* compute a ray sample */
273			float res[3];
274			FVECT org, dir;
275			register struct rtproc *rt;
276			{
277			register float *fp;
278
279			if (rt->nrays == rt->bsiz)
280			rayflush(rt);
281			rt->dest[rt->nrays] = res;
282			fp = rt->buf + 6*rt->nrays++;
283			fp++ = org[0]; fp++ = org[1]; *fp++ = org[2];
284			fp++ = dir[0]; fp++ = dir[1]; *fp = dir[2];
285			}
286
287
288			rayflush(rt) /* flush buffered rays */
289			register struct rtproc *rt;
290			{
291			register int i;
292
293			if (rt->nrays <= 0)
294			return;
295			i = 6*rt->nrays + 3;
296			rt->buf[i++] = 0.; rt->buf[i++] = 0.; rt->buf[i] = 0.;
297			if ( process(rt->pd, (char )rt->buf, (char )rt->buf,
298			3sizeof(float)rt->nrays,
299			6sizeof(float)(rt->nrays+1)) <
300			3sizeof(float)rt->nrays )
301			error(SYSTEM, "error reading from rtrace process");
302			i = rt->nrays;
303			while (i--) {
304			rt->dest[i][0] += rt->buf[3*i];
305			rt->dest[i][1] += rt->buf[3*i+1];
306			rt->dest[i][2] += rt->buf[3*i+2];
307			}
308			rt->nrays = 0;
309	greg	1.1	}