| 53 |
|
FVECT vrefl; /* vector in reflected direction */ |
| 54 |
|
FVECT prdir; /* vector in transmitted direction */ |
| 55 |
|
FVECT u, v; /* u and v vectors orienting anisotropy */ |
| 56 |
< |
double u_alpha2; /* u roughness squared */ |
| 57 |
< |
double v_alpha2; /* v roughness squared */ |
| 56 |
> |
double u_alpha; /* u roughness */ |
| 57 |
> |
double v_alpha; /* v roughness */ |
| 58 |
|
double rdiff, rspec; /* reflected specular, diffuse */ |
| 59 |
|
double trans; /* transmissivity */ |
| 60 |
|
double tdiff, tspec; /* transmitted specular, diffuse */ |
| 103 |
|
au2 = av2 = omega/(4.0*PI); |
| 104 |
|
else |
| 105 |
|
au2 = av2 = 0.0; |
| 106 |
< |
au2 += np->u_alpha2; |
| 107 |
< |
av2 += np->v_alpha2; |
| 106 |
> |
au2 += np->u_alpha*np->u_alpha; |
| 107 |
> |
av2 += np->v_alpha*np->v_alpha; |
| 108 |
|
/* half vector */ |
| 109 |
|
h[0] = ldir[0] - np->rp->rdir[0]; |
| 110 |
|
h[1] = ldir[1] - np->rp->rdir[1]; |
| 143 |
|
*/ |
| 144 |
|
/* roughness + source */ |
| 145 |
|
au2 = av2 = omega / PI; |
| 146 |
< |
au2 += np->u_alpha2; |
| 147 |
< |
av2 += np->v_alpha2; |
| 146 |
> |
au2 += np->u_alpha*np->u_alpha; |
| 147 |
> |
av2 += np->v_alpha*np->v_alpha; |
| 148 |
|
/* "half vector" */ |
| 149 |
|
h[0] = ldir[0] - np->prdir[0]; |
| 150 |
|
h[1] = ldir[1] - np->prdir[1]; |
| 196 |
|
m->oargs.farg[2]); |
| 197 |
|
/* get roughness */ |
| 198 |
|
nd.specfl = 0; |
| 199 |
< |
nd.u_alpha2 = m->oargs.farg[4]; |
| 200 |
< |
nd.u_alpha2 *= nd.u_alpha2; |
| 201 |
< |
nd.v_alpha2 = m->oargs.farg[5]; |
| 202 |
< |
nd.v_alpha2 *= nd.v_alpha2; |
| 203 |
< |
if (nd.u_alpha2 < FTINY*FTINY || nd.v_alpha2 <= FTINY*FTINY) |
| 199 |
> |
nd.u_alpha = m->oargs.farg[4]; |
| 200 |
> |
nd.v_alpha = m->oargs.farg[5]; |
| 201 |
> |
if (nd.u_alpha < FTINY || nd.v_alpha <= FTINY) |
| 202 |
|
objerror(m, USER, "roughness too small"); |
| 203 |
|
/* reorient if necessary */ |
| 204 |
|
if (r->rod < 0.0) |
| 345 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
| 346 |
|
multisamp(rv, 2, d); |
| 347 |
|
d = 2.0*PI * rv[0]; |
| 348 |
< |
cosp = cos(d); |
| 349 |
< |
sinp = sin(d); |
| 350 |
< |
d = sqrt(np->u_alpha2*cosp*cosp + np->v_alpha2*sinp*sinp); |
| 348 |
> |
cosp = cos(d) * np->u_alpha; |
| 349 |
> |
sinp = sin(d) * np->v_alpha; |
| 350 |
> |
d = sqrt(cosp*cosp + sinp*sinp); |
| 351 |
|
cosp /= d; |
| 352 |
|
sinp /= d; |
| 353 |
|
rv[1] = 1.0 - specjitter*rv[1]; |
| 355 |
|
d = 1.0; |
| 356 |
|
else |
| 357 |
|
d = sqrt(-log(rv[1]) / |
| 358 |
< |
(cosp*cosp/np->u_alpha2 + |
| 359 |
< |
sinp*sinp/np->v_alpha2)); |
| 358 |
> |
(cosp*cosp/(np->u_alpha*np->u_alpha) + |
| 359 |
> |
sinp*sinp/(np->v_alpha*np->v_alpha))); |
| 360 |
|
for (i = 0; i < 3; i++) |
| 361 |
|
h[i] = np->pnorm[i] + |
| 362 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
| 377 |
|
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
| 378 |
|
multisamp(rv, 2, d); |
| 379 |
|
d = 2.0*PI * rv[0]; |
| 380 |
< |
cosp = cos(d); |
| 381 |
< |
sinp = sin(d); |
| 380 |
> |
cosp = cos(d) * np->u_alpha; |
| 381 |
> |
sinp = sin(d) * np->v_alpha; |
| 382 |
> |
d = sqrt(cosp*cosp + sinp*sinp); |
| 383 |
> |
cosp /= d; |
| 384 |
> |
sinp /= d; |
| 385 |
|
rv[1] = 1.0 - specjitter*rv[1]; |
| 386 |
|
if (rv[1] <= FTINY) |
| 387 |
|
d = 1.0; |
| 388 |
|
else |
| 389 |
|
d = sqrt(-log(rv[1]) / |
| 390 |
< |
(cosp*cosp*4./np->u_alpha2 + |
| 391 |
< |
sinp*sinp*4./np->v_alpha2)); |
| 390 |
> |
(cosp*cosp/(np->u_alpha*np->u_alpha) + |
| 391 |
> |
sinp*sinp/(np->v_alpha*np->u_alpha))); |
| 392 |
|
for (i = 0; i < 3; i++) |
| 393 |
|
sr.rdir[i] = np->prdir[i] + |
| 394 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
