| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: mkillum2.c,v 2.16 2004/09/17 21:43:50 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines to do the actual calculation for mkillum |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <string.h> |
| 9 |
|
| 10 |
#include "mkillum.h" |
| 11 |
#include "face.h" |
| 12 |
#include "cone.h" |
| 13 |
#include "random.h" |
| 14 |
#include "selcall.h" |
| 15 |
|
| 16 |
|
| 17 |
static void mkaxes(FVECT u, FVECT v, FVECT n); |
| 18 |
static void rounddir(FVECT dv, double alt, double azi); |
| 19 |
static void flatdir(FVECT dv, double alt, double azi); |
| 20 |
|
| 21 |
|
| 22 |
static void |
| 23 |
rayclean( /* finish all pending rays */ |
| 24 |
struct rtproc *rt0 |
| 25 |
) |
| 26 |
{ |
| 27 |
rayflush(rt0, 1); |
| 28 |
while (raywait(rt0) != NULL) |
| 29 |
; |
| 30 |
} |
| 31 |
|
| 32 |
|
| 33 |
int /* XXX type conflict with otypes.h */ |
| 34 |
o_default( /* default illum action */ |
| 35 |
OBJREC *ob, |
| 36 |
struct illum_args *il, |
| 37 |
struct rtproc *rt0, |
| 38 |
char *nm |
| 39 |
) |
| 40 |
{ |
| 41 |
sprintf(errmsg, "(%s): cannot make illum for %s \"%s\"", |
| 42 |
nm, ofun[ob->otype].funame, ob->oname); |
| 43 |
error(WARNING, errmsg); |
| 44 |
printobj(il->altmat, ob); |
| 45 |
return(1); |
| 46 |
} |
| 47 |
|
| 48 |
|
| 49 |
int |
| 50 |
o_face( /* make an illum face */ |
| 51 |
OBJREC *ob, |
| 52 |
struct illum_args *il, |
| 53 |
struct rtproc *rt0, |
| 54 |
char *nm |
| 55 |
) |
| 56 |
{ |
| 57 |
#define MAXMISS (5*n*il->nsamps) |
| 58 |
int dim[3]; |
| 59 |
int n, nalt, nazi, h; |
| 60 |
float *distarr; |
| 61 |
double sp[2], r1, r2; |
| 62 |
FVECT dn, org, dir; |
| 63 |
FVECT u, v; |
| 64 |
double ur[2], vr[2]; |
| 65 |
int nmisses; |
| 66 |
register FACE *fa; |
| 67 |
register int i, j; |
| 68 |
/* get/check arguments */ |
| 69 |
fa = getface(ob); |
| 70 |
if (fa->area == 0.0) { |
| 71 |
freeface(ob); |
| 72 |
return(o_default(ob, il, rt0, nm)); |
| 73 |
} |
| 74 |
/* set up sampling */ |
| 75 |
if (il->sampdens <= 0) |
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nalt = nazi = 1; |
| 77 |
else { |
| 78 |
n = PI * il->sampdens; |
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nalt = sqrt(n/PI) + .5; |
| 80 |
nazi = PI*nalt + .5; |
| 81 |
} |
| 82 |
n = nalt*nazi; |
| 83 |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 84 |
if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_face"); |
| 86 |
/* take first edge longer than sqrt(area) */ |
| 87 |
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
| 88 |
u[0] = VERTEX(fa,i)[0] - VERTEX(fa,j)[0]; |
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u[1] = VERTEX(fa,i)[1] - VERTEX(fa,j)[1]; |
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u[2] = VERTEX(fa,i)[2] - VERTEX(fa,j)[2]; |
| 91 |
if ((r1 = DOT(u,u)) >= fa->area-FTINY) |
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break; |
| 93 |
} |
| 94 |
if (i < fa->nv) { /* got one! -- let's align our axes */ |
| 95 |
r2 = 1.0/sqrt(r1); |
| 96 |
u[0] *= r2; u[1] *= r2; u[2] *= r2; |
| 97 |
fcross(v, fa->norm, u); |
| 98 |
} else /* oh well, we'll just have to wing it */ |
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mkaxes(u, v, fa->norm); |
| 100 |
/* now, find limits in (u,v) coordinates */ |
| 101 |
ur[0] = vr[0] = FHUGE; |
| 102 |
ur[1] = vr[1] = -FHUGE; |
| 103 |
for (i = 0; i < fa->nv; i++) { |
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r1 = DOT(VERTEX(fa,i),u); |
| 105 |
if (r1 < ur[0]) ur[0] = r1; |
| 106 |
if (r1 > ur[1]) ur[1] = r1; |
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r2 = DOT(VERTEX(fa,i),v); |
| 108 |
if (r2 < vr[0]) vr[0] = r2; |
| 109 |
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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h = ilhash(dim, 3) + i; |
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multisamp(sp, 2, urand(h)); |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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flatdir(dn, r1, r2); |
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for (j = 0; j < 3; j++) |
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dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*fa->norm[j]; |
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/* random location */ |
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do { |
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multisamp(sp, 2, urand(h+4862+nmisses)); |
| 128 |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 129 |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
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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]; |
| 133 |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
| 134 |
if (nmisses > MAXMISS) { |
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objerror(ob, WARNING, "bad aspect"); |
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rayclean(rt0); |
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freeface(ob); |
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free((void *)distarr); |
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return(o_default(ob, il, rt0, nm)); |
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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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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
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rayclean(rt0); |
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/* write out the face and its distribution */ |
| 148 |
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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} else |
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printobj(il->altmat, ob); |
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/* clean up */ |
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freeface(ob); |
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free((void *)distarr); |
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return(0); |
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#undef MAXMISS |
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} |
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|
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|
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int |
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o_sphere( /* make an illum sphere */ |
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register OBJREC *ob, |
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struct illum_args *il, |
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struct rtproc *rt0, |
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char *nm |
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) |
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{ |
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int dim[3]; |
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int n, nalt, nazi; |
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float *distarr; |
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double sp[4], r1, r2, r3; |
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FVECT org, dir; |
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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 */ |
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if (il->sampdens <= 0) |
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nalt = nazi = 1; |
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else { |
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n = 4.*PI * il->sampdens; |
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nalt = sqrt(2./PI*n) + .5; |
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nazi = PI/2.*nalt + .5; |
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} |
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n = nalt*nazi; |
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distarr = (float *)calloc(n, 3*sizeof(float)); |
| 190 |
if (distarr == NULL) |
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error(SYSTEM, "out of memory in o_sphere"); |
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dim[0] = random(); |
| 193 |
/* sample sphere */ |
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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]++) |
| 196 |
for (i = 0; i < il->nsamps; i++) { |
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/* next sample point */ |
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multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
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/* random direction */ |
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r1 = (dim[1] + sp[0])/nalt; |
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r2 = (dim[2] + sp[1] - .5)/nazi; |
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rounddir(dir, r1, r2); |
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/* random location */ |
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mkaxes(u, v, dir); /* yuck! */ |
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r3 = sqrt(sp[2]); |
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r2 = 2.*PI*sp[3]; |
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r1 = r3*ob->oargs.farg[3]*cos(r2); |
| 208 |
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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} |
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/* send sample */ |
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raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
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} |
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rayclean(rt0); |
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/* write out the sphere and its distribution */ |
| 220 |
if (average(il, distarr, nalt*nazi)) { |
| 221 |
if (il->sampdens > 0) |
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roundout(il, distarr, nalt, nazi); |
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else |
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objerror(ob, WARNING, "diffuse distribution"); |
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illumout(il, ob); |
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} else |
| 227 |
printobj(il->altmat, ob); |
| 228 |
/* clean up */ |
| 229 |
free((void *)distarr); |
| 230 |
return(1); |
| 231 |
} |
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|
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|
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int |
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o_ring( /* make an illum ring */ |
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OBJREC *ob, |
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struct illum_args *il, |
| 238 |
struct rtproc *rt0, |
| 239 |
char *nm |
| 240 |
) |
| 241 |
{ |
| 242 |
int dim[3]; |
| 243 |
int n, nalt, nazi; |
| 244 |
float *distarr; |
| 245 |
double sp[4], r1, r2, r3; |
| 246 |
FVECT dn, org, dir; |
| 247 |
FVECT u, v; |
| 248 |
register CONE *co; |
| 249 |
register int i, j; |
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/* get/check arguments */ |
| 251 |
co = getcone(ob, 0); |
| 252 |
/* set up sampling */ |
| 253 |
if (il->sampdens <= 0) |
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nalt = nazi = 1; |
| 255 |
else { |
| 256 |
n = PI * il->sampdens; |
| 257 |
nalt = sqrt(n/PI) + .5; |
| 258 |
nazi = PI*nalt + .5; |
| 259 |
} |
| 260 |
n = nalt*nazi; |
| 261 |
distarr = (float *)calloc(n, 3*sizeof(float)); |
| 262 |
if (distarr == NULL) |
| 263 |
error(SYSTEM, "out of memory in o_ring"); |
| 264 |
mkaxes(u, v, co->ad); |
| 265 |
dim[0] = random(); |
| 266 |
/* sample disk */ |
| 267 |
for (dim[1] = 0; dim[1] < nalt; dim[1]++) |
| 268 |
for (dim[2] = 0; dim[2] < nazi; dim[2]++) |
| 269 |
for (i = 0; i < il->nsamps; i++) { |
| 270 |
/* next sample point */ |
| 271 |
multisamp(sp, 4, urand(ilhash(dim,3)+i)); |
| 272 |
/* random direction */ |
| 273 |
r1 = (dim[1] + sp[0])/nalt; |
| 274 |
r2 = (dim[2] + sp[1] - .5)/nazi; |
| 275 |
flatdir(dn, r1, r2); |
| 276 |
for (j = 0; j < 3; j++) |
| 277 |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 278 |
/* random location */ |
| 279 |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 280 |
sp[2]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 281 |
r2 = 2.*PI*sp[3]; |
| 282 |
r1 = r3*cos(r2); |
| 283 |
r2 = r3*sin(r2); |
| 284 |
for (j = 0; j < 3; j++) |
| 285 |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
| 286 |
.001*co->ad[j]; |
| 287 |
|
| 288 |
/* send sample */ |
| 289 |
raysamp(distarr+3*(dim[1]*nazi+dim[2]), org, dir, rt0); |
| 290 |
} |
| 291 |
rayclean(rt0); |
| 292 |
/* write out the ring and its distribution */ |
| 293 |
if (average(il, distarr, nalt*nazi)) { |
| 294 |
if (il->sampdens > 0) |
| 295 |
flatout(il, distarr, nalt, nazi, u, v, co->ad); |
| 296 |
illumout(il, ob); |
| 297 |
} else |
| 298 |
printobj(il->altmat, ob); |
| 299 |
/* clean up */ |
| 300 |
freecone(ob); |
| 301 |
free((void *)distarr); |
| 302 |
return(1); |
| 303 |
} |
| 304 |
|
| 305 |
|
| 306 |
void |
| 307 |
raysamp( /* queue a ray sample */ |
| 308 |
float res[3], |
| 309 |
FVECT org, |
| 310 |
FVECT dir, |
| 311 |
struct rtproc *rt0 |
| 312 |
) |
| 313 |
{ |
| 314 |
register struct rtproc *rt; |
| 315 |
register float *fp; |
| 316 |
|
| 317 |
for (rt = rt0; rt != NULL; rt = rt->next) |
| 318 |
if (rt->nrays < rt->bsiz && rt->dest[rt->nrays] == NULL) |
| 319 |
break; |
| 320 |
if (rt == NULL) /* need to free up buffer? */ |
| 321 |
rt = raywait(rt0); |
| 322 |
if (rt == NULL) |
| 323 |
error(SYSTEM, "raywait() returned NULL in raysamp()"); |
| 324 |
fp = rt->buf + 6*rt->nrays; |
| 325 |
*fp++ = org[0]; *fp++ = org[1]; *fp++ = org[2]; |
| 326 |
*fp++ = dir[0]; *fp++ = dir[1]; *fp = dir[2]; |
| 327 |
rt->dest[rt->nrays++] = res; |
| 328 |
if (rt->nrays == rt->bsiz) |
| 329 |
rayflush(rt, 0); |
| 330 |
} |
| 331 |
|
| 332 |
|
| 333 |
void |
| 334 |
rayflush( /* flush queued rays to rtrace */ |
| 335 |
register struct rtproc *rt, |
| 336 |
int doall |
| 337 |
) |
| 338 |
{ |
| 339 |
int nw; |
| 340 |
|
| 341 |
do { |
| 342 |
if (rt->nrays <= 0) |
| 343 |
continue; |
| 344 |
memset(rt->buf+6*rt->nrays, 0, 6*sizeof(float)); |
| 345 |
nw = 6*sizeof(float)*(rt->nrays+1); |
| 346 |
errno = 0; |
| 347 |
if (writebuf(rt->pd.w, (char *)rt->buf, nw) < nw) |
| 348 |
error(SYSTEM, "error writing to rtrace process"); |
| 349 |
rt->nrays = 0; /* flag buffer as flushed */ |
| 350 |
} while (doall && (rt = rt->next) != NULL); |
| 351 |
} |
| 352 |
|
| 353 |
|
| 354 |
struct rtproc * |
| 355 |
raywait( /* retrieve rtrace results */ |
| 356 |
struct rtproc *rt0 |
| 357 |
) |
| 358 |
{ |
| 359 |
fd_set readset, errset; |
| 360 |
int nr; |
| 361 |
struct rtproc *rtfree; |
| 362 |
register struct rtproc *rt; |
| 363 |
register int n; |
| 364 |
/* prepare select call */ |
| 365 |
FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
| 366 |
nr = 0; |
| 367 |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 368 |
if (rt->nrays == 0 && rt->dest[0] != NULL) { |
| 369 |
FD_SET(rt->pd.r, &readset); |
| 370 |
++nr; |
| 371 |
} |
| 372 |
FD_SET(rt->pd.r, &errset); |
| 373 |
if (rt->pd.r >= n) |
| 374 |
n = rt->pd.r + 1; |
| 375 |
} |
| 376 |
if (!nr) /* no rays pending */ |
| 377 |
return(NULL); |
| 378 |
if (nr > 1) { /* call select for multiple processes */ |
| 379 |
errno = 0; |
| 380 |
if (select(n, &readset, NULL, &errset, NULL) < 0) |
| 381 |
error(SYSTEM, "select call error in raywait()"); |
| 382 |
} else |
| 383 |
FD_ZERO(&errset); |
| 384 |
rtfree = NULL; /* read from ready process(es) */ |
| 385 |
for (rt = rt0; rt != NULL; rt = rt->next) { |
| 386 |
if (!FD_ISSET(rt->pd.r, &readset) && |
| 387 |
!FD_ISSET(rt->pd.r, &errset)) |
| 388 |
continue; |
| 389 |
for (n = 0; n < rt->bsiz && rt->dest[n] != NULL; n++) |
| 390 |
; |
| 391 |
nr = 3*sizeof(float)*(n+1); |
| 392 |
if (readbuf(rt->pd.r, (char *)rt->buf, nr) < nr) |
| 393 |
error(USER, "rtrace process died"); |
| 394 |
while (n-- > 0) { |
| 395 |
rt->dest[n][0] += rt->buf[3*n]; |
| 396 |
rt->dest[n][1] += rt->buf[3*n+1]; |
| 397 |
rt->dest[n][2] += rt->buf[3*n+2]; |
| 398 |
rt->dest[n] = NULL; |
| 399 |
} |
| 400 |
rtfree = rt; |
| 401 |
} |
| 402 |
return(rtfree); |
| 403 |
} |
| 404 |
|
| 405 |
|
| 406 |
static void |
| 407 |
mkaxes( /* compute u and v to go with n */ |
| 408 |
FVECT u, |
| 409 |
FVECT v, |
| 410 |
FVECT n |
| 411 |
) |
| 412 |
{ |
| 413 |
register int i; |
| 414 |
|
| 415 |
v[0] = v[1] = v[2] = 0.0; |
| 416 |
for (i = 0; i < 3; i++) |
| 417 |
if (n[i] < 0.6 && n[i] > -0.6) |
| 418 |
break; |
| 419 |
v[i] = 1.0; |
| 420 |
fcross(u, v, n); |
| 421 |
normalize(u); |
| 422 |
fcross(v, n, u); |
| 423 |
} |
| 424 |
|
| 425 |
|
| 426 |
static void |
| 427 |
rounddir( /* compute uniform spherical direction */ |
| 428 |
register FVECT dv, |
| 429 |
double alt, |
| 430 |
double azi |
| 431 |
) |
| 432 |
{ |
| 433 |
double d1, d2; |
| 434 |
|
| 435 |
dv[2] = 1. - 2.*alt; |
| 436 |
d1 = sqrt(1. - dv[2]*dv[2]); |
| 437 |
d2 = 2.*PI * azi; |
| 438 |
dv[0] = d1*cos(d2); |
| 439 |
dv[1] = d1*sin(d2); |
| 440 |
} |
| 441 |
|
| 442 |
|
| 443 |
static void |
| 444 |
flatdir( /* compute uniform hemispherical direction */ |
| 445 |
register FVECT dv, |
| 446 |
double alt, |
| 447 |
double azi |
| 448 |
) |
| 449 |
{ |
| 450 |
double d1, d2; |
| 451 |
|
| 452 |
d1 = sqrt(alt); |
| 453 |
d2 = 2.*PI * azi; |
| 454 |
dv[0] = d1*cos(d2); |
| 455 |
dv[1] = d1*sin(d2); |
| 456 |
dv[2] = sqrt(1. - alt); |
| 457 |
} |
