1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
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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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greg |
1.4 |
* Routines to do the actual calculation for mkillum |
9 |
greg |
1.1 |
*/ |
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#include "mkillum.h" |
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#include "face.h" |
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#include "cone.h" |
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greg |
1.2 |
#include "random.h" |
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greg |
1.1 |
|
19 |
greg |
1.2 |
|
20 |
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o_default(ob, il, rt, nm) /* default illum action */ |
21 |
greg |
1.1 |
OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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greg |
1.2 |
char *nm; |
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greg |
1.1 |
{ |
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greg |
1.2 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
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nm, ofun[ob->otype].funame, ob->oname); |
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error(WARNING, errmsg); |
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greg |
2.2 |
printobj(il->altmat, ob); |
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greg |
1.2 |
} |
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o_face(ob, il, rt, nm) /* make an illum face */ |
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OBJREC *ob; |
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struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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{ |
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greg |
1.3 |
#define MAXMISS (5*n*il->nsamps) |
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greg |
1.10 |
int dim[3]; |
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int n, nalt, nazi, h; |
42 |
greg |
1.3 |
float *distarr; |
43 |
greg |
1.10 |
double sp[2], r1, r2; |
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greg |
1.4 |
FVECT dn, org, dir; |
45 |
greg |
1.3 |
FVECT u, v; |
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double ur[2], vr[2]; |
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int nmisses; |
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register FACE *fa; |
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register int i, j; |
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/* get/check arguments */ |
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fa = getface(ob); |
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if (fa->area == 0.0) { |
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freeface(ob); |
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o_default(ob, il, rt, nm); |
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return; |
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} |
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/* set up sampling */ |
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greg |
1.11 |
if (il->sampdens <= 0) |
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nalt = nazi = 1; |
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else { |
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n = PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
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nazi = PI*nalt + .5; |
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} |
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greg |
1.3 |
n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_face"); |
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greg |
2.3 |
/* take first edge longer than sqrt(area) */ |
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for (i = 1; i < fa->nv; i++) { |
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for (j = 0; j < 3; j++) |
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u[j] = VERTEX(fa,i)[j] - VERTEX(fa,i-1)[j]; |
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if (DOT(u,u) >= fa->area-FTINY) |
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break; |
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} |
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if (i < fa->nv) { /* got one! -- let's align our axes */ |
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normalize(u); |
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fcross(v, fa->norm, u); |
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} else /* oh well, we'll just have to wing it */ |
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mkaxes(u, v, fa->norm); |
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/* now, find limits in (u,v) coordinates */ |
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greg |
1.3 |
ur[0] = vr[0] = FHUGE; |
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ur[1] = vr[1] = -FHUGE; |
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for (i = 0; i < fa->nv; i++) { |
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r1 = DOT(VERTEX(fa,i),u); |
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if (r1 < ur[0]) ur[0] = r1; |
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if (r1 > ur[1]) ur[1] = r1; |
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r2 = DOT(VERTEX(fa,i),v); |
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if (r2 < vr[0]) vr[0] = r2; |
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if (r2 > vr[1]) vr[1] = r2; |
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} |
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dim[0] = random(); |
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/* sample polygon */ |
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nmisses = 0; |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
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for (i = 0; i < il->nsamps; i++) { |
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/* random direction */ |
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greg |
1.10 |
h = ilhash(dim, 3) + i; |
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greg |
1.11 |
multisamp(sp, 2, urand(h)); |
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greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
102 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
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greg |
1.3 |
flatdir(dn, r1, r2); |
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for (j = 0; j < 3; j++) |
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greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
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greg |
1.3 |
/* random location */ |
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do { |
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greg |
1.11 |
multisamp(sp, 2, urand(h+4862+nmisses)); |
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greg |
1.10 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
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r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
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greg |
1.3 |
for (j = 0; j < 3; j++) |
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org[j] = r1*u[j] + r2*v[j] |
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+ fa->offset*fa->norm[j]; |
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} while (!inface(org, fa) && nmisses++ < MAXMISS); |
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if (nmisses > MAXMISS) { |
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objerror(ob, WARNING, "bad aspect"); |
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rt->nrays = 0; |
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freeface(ob); |
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free((char *)distarr); |
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o_default(ob, il, rt, nm); |
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return; |
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} |
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for (j = 0; j < 3; j++) |
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org[j] += .001*fa->norm[j]; |
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/* send sample */ |
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greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
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greg |
1.3 |
} |
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rayflush(rt); |
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greg |
1.11 |
/* write out the face and its distribution */ |
130 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
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if (il->sampdens > 0) |
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flatout(il, distarr, nalt, nazi, u, v, fa->norm); |
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illumout(il, ob); |
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greg |
2.2 |
} else |
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greg |
1.12 |
printobj(il->altmat, ob); |
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greg |
1.3 |
/* clean up */ |
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freeface(ob); |
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free((char *)distarr); |
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#undef MAXMISS |
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greg |
1.2 |
} |
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142 |
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143 |
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o_sphere(ob, il, rt, nm) /* make an illum sphere */ |
144 |
greg |
1.3 |
register OBJREC *ob; |
145 |
greg |
1.2 |
struct illum_args *il; |
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struct rtproc *rt; |
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char *nm; |
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{ |
149 |
greg |
1.10 |
int dim[3]; |
150 |
greg |
1.2 |
int n, nalt, nazi; |
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float *distarr; |
152 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
153 |
greg |
1.4 |
FVECT org, dir; |
154 |
greg |
1.2 |
FVECT u, v; |
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register int i, j; |
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/* check arguments */ |
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if (ob->oargs.nfargs != 4) |
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objerror(ob, USER, "bad # of arguments"); |
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/* set up sampling */ |
160 |
greg |
1.11 |
if (il->sampdens <= 0) |
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nalt = nazi = 1; |
162 |
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else { |
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n = 4.*PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
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nazi = PI*nalt + .5; |
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} |
167 |
greg |
1.2 |
n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
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if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_sphere"); |
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dim[0] = random(); |
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/* sample sphere */ |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
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greg |
1.8 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
175 |
greg |
1.2 |
for (i = 0; i < il->nsamps; i++) { |
176 |
greg |
1.10 |
/* next sample point */ |
177 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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greg |
1.2 |
/* random direction */ |
179 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
180 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
181 |
greg |
1.2 |
rounddir(dir, r1, r2); |
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/* random location */ |
183 |
greg |
1.8 |
mkaxes(u, v, dir); /* yuck! */ |
184 |
greg |
1.10 |
r3 = sqrt(sp[2]); |
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r2 = 2.*PI*sp[3]; |
186 |
greg |
1.5 |
r1 = r3*ob->oargs.farg[3]*cos(r2); |
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r2 = r3*ob->oargs.farg[3]*sin(r2); |
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r3 = ob->oargs.farg[3]*sqrt(1.01-r3*r3); |
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for (j = 0; j < 3; j++) { |
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org[j] = ob->oargs.farg[j] + r1*u[j] + r2*v[j] + |
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r3*dir[j]; |
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dir[j] = -dir[j]; |
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} |
194 |
greg |
1.2 |
/* send sample */ |
195 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
196 |
greg |
1.2 |
} |
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rayflush(rt); |
198 |
greg |
1.11 |
/* write out the sphere and its distribution */ |
199 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
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if (il->sampdens > 0) |
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roundout(il, distarr, nalt, nazi); |
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else |
203 |
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objerror(ob, WARNING, "diffuse distribution"); |
204 |
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illumout(il, ob); |
205 |
greg |
2.2 |
} else |
206 |
greg |
1.12 |
printobj(il->altmat, ob); |
207 |
greg |
1.2 |
/* clean up */ |
208 |
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free((char *)distarr); |
209 |
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} |
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211 |
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212 |
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o_ring(ob, il, rt, nm) /* make an illum ring */ |
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OBJREC *ob; |
214 |
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struct illum_args *il; |
215 |
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struct rtproc *rt; |
216 |
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char *nm; |
217 |
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{ |
218 |
greg |
1.10 |
int dim[3]; |
219 |
greg |
1.3 |
int n, nalt, nazi; |
220 |
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float *distarr; |
221 |
greg |
1.10 |
double sp[4], r1, r2, r3; |
222 |
greg |
1.4 |
FVECT dn, org, dir; |
223 |
greg |
1.3 |
FVECT u, v; |
224 |
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register CONE *co; |
225 |
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register int i, j; |
226 |
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/* get/check arguments */ |
227 |
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co = getcone(ob, 0); |
228 |
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/* set up sampling */ |
229 |
greg |
1.11 |
if (il->sampdens <= 0) |
230 |
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nalt = nazi = 1; |
231 |
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else { |
232 |
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n = PI * il->sampdens; |
233 |
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nalt = sqrt(n/PI) + .5; |
234 |
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nazi = PI*nalt + .5; |
235 |
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} |
236 |
greg |
1.3 |
n = nalt*nazi; |
237 |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
238 |
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if (distarr == NULL) |
239 |
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error(SYSTEM, "out of memory in o_ring"); |
240 |
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mkaxes(u, v, co->ad); |
241 |
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dim[0] = random(); |
242 |
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/* sample disk */ |
243 |
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for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
244 |
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for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
245 |
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for (i = 0; i < il->nsamps; i++) { |
246 |
greg |
1.10 |
/* next sample point */ |
247 |
greg |
1.11 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
248 |
greg |
1.3 |
/* random direction */ |
249 |
greg |
1.10 |
r1 = (dim[1] + sp[0])/nalt; |
250 |
greg |
1.13 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
251 |
greg |
1.3 |
flatdir(dn, r1, r2); |
252 |
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for (j = 0; j < 3; j++) |
253 |
greg |
1.5 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
254 |
greg |
1.3 |
/* random location */ |
255 |
greg |
1.5 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
256 |
greg |
1.10 |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
257 |
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r2 = 2.*PI*sp[3]; |
258 |
greg |
1.5 |
r1 = r3*cos(r2); |
259 |
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r2 = r3*sin(r2); |
260 |
greg |
1.3 |
for (j = 0; j < 3; j++) |
261 |
greg |
1.5 |
org[j] = CO_P0(co)[j] + r1*u[j] + r1*v[j] + |
262 |
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.001*co->ad[j]; |
263 |
greg |
1.3 |
|
264 |
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/* send sample */ |
265 |
greg |
1.7 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt); |
266 |
greg |
1.3 |
} |
267 |
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rayflush(rt); |
268 |
greg |
1.11 |
/* write out the ring and its distribution */ |
269 |
greg |
1.12 |
if (average(il, distarr, nalt*nazi)) { |
270 |
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if (il->sampdens > 0) |
271 |
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flatout(il, distarr, nalt, nazi, u, v, co->ad); |
272 |
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illumout(il, ob); |
273 |
greg |
2.2 |
} else |
274 |
greg |
1.12 |
printobj(il->altmat, ob); |
275 |
greg |
1.3 |
/* clean up */ |
276 |
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freecone(ob); |
277 |
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free((char *)distarr); |
278 |
greg |
1.2 |
} |
279 |
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280 |
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281 |
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raysamp(res, org, dir, rt) /* compute a ray sample */ |
282 |
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float res[3]; |
283 |
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FVECT org, dir; |
284 |
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register struct rtproc *rt; |
285 |
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{ |
286 |
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register float *fp; |
287 |
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288 |
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if (rt->nrays == rt->bsiz) |
289 |
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rayflush(rt); |
290 |
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rt->dest[rt->nrays] = res; |
291 |
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fp = rt->buf + 6*rt->nrays++; |
292 |
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*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
293 |
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*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
294 |
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} |
295 |
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296 |
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297 |
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rayflush(rt) /* flush buffered rays */ |
298 |
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register struct rtproc *rt; |
299 |
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{ |
300 |
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register int i; |
301 |
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302 |
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if (rt->nrays <= 0) |
303 |
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return; |
304 |
greg |
1.9 |
bzero(rt->buf+6*rt->nrays, 6*sizeof(float)); |
305 |
greg |
1.14 |
errno = 0; |
306 |
greg |
1.2 |
if ( process(rt->pd, (char *)rt->buf, (char *)rt->buf, |
307 |
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3*sizeof(float)*rt->nrays, |
308 |
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6*sizeof(float)*(rt->nrays+1)) < |
309 |
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3*sizeof(float)*rt->nrays ) |
310 |
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error(SYSTEM, "error reading from rtrace process"); |
311 |
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i = rt->nrays; |
312 |
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while (i--) { |
313 |
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rt->dest[i][0] += rt->buf[3*i]; |
314 |
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rt->dest[i][1] += rt->buf[3*i+1]; |
315 |
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rt->dest[i][2] += rt->buf[3*i+2]; |
316 |
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} |
317 |
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rt->nrays = 0; |
318 |
greg |
1.4 |
} |
319 |
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320 |
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321 |
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mkaxes(u, v, n) /* compute u and v to go with n */ |
322 |
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FVECT u, v, n; |
323 |
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{ |
324 |
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register int i; |
325 |
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326 |
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v[0] = v[1] = v[2] = 0.0; |
327 |
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for (i = 0; i < 3; i++) |
328 |
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if (n[i] < 0.6 && n[i] > -0.6) |
329 |
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break; |
330 |
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v[i] = 1.0; |
331 |
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fcross(u, v, n); |
332 |
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normalize(u); |
333 |
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fcross(v, n, u); |
334 |
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} |
335 |
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336 |
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337 |
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rounddir(dv, alt, azi) /* compute uniform spherical direction */ |
338 |
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register FVECT dv; |
339 |
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double alt, azi; |
340 |
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{ |
341 |
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double d1, d2; |
342 |
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343 |
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dv[2] = 1. - 2.*alt; |
344 |
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d1 = sqrt(1. - dv[2]*dv[2]); |
345 |
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d2 = 2.*PI * azi; |
346 |
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dv[0] = d1*cos(d2); |
347 |
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dv[1] = d1*sin(d2); |
348 |
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} |
349 |
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350 |
|
|
|
351 |
|
|
flatdir(dv, alt, azi) /* compute uniform hemispherical direction */ |
352 |
|
|
register FVECT dv; |
353 |
|
|
double alt, azi; |
354 |
|
|
{ |
355 |
|
|
double d1, d2; |
356 |
|
|
|
357 |
|
|
d1 = sqrt(alt); |
358 |
|
|
d2 = 2.*PI * azi; |
359 |
|
|
dv[0] = d1*cos(d2); |
360 |
|
|
dv[1] = d1*sin(d2); |
361 |
greg |
1.6 |
dv[2] = sqrt(1. - alt); |
362 |
greg |
1.1 |
} |