| 68 |
|
FVECT pnorm; /* perturbed surface normal */ |
| 69 |
|
FVECT vray; /* local outgoing (return) vector */ |
| 70 |
|
double sr_vpsa[2]; /* sqrt of BSDF projected solid angle extrema */ |
| 71 |
– |
double thru_r2; /* through rejection angle squared */ |
| 71 |
|
RREAL toloc[3][3]; /* world to local BSDF coords */ |
| 72 |
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
| 73 |
|
double thick; /* surface thickness */ |
| 98 |
|
|
| 99 |
|
/* Evaluate BSDF for direct component, returning true if OK to proceed */ |
| 100 |
|
static int |
| 101 |
< |
direct_bsdf_OK(COLOR cval, FVECT ldir, BSDFDAT *ndp) |
| 101 |
> |
direct_bsdf_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
| 102 |
|
{ |
| 103 |
< |
FVECT vsrc, vjit; |
| 103 |
> |
int nsamp, ok = 0; |
| 104 |
> |
FVECT vsrc, vsmp, vjit; |
| 105 |
> |
double tomega; |
| 106 |
> |
double sf, sd[2]; |
| 107 |
> |
COLOR csmp; |
| 108 |
|
SDValue sv; |
| 109 |
|
SDError ec; |
| 110 |
+ |
int i; |
| 111 |
|
/* transform source direction */ |
| 112 |
|
if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) |
| 113 |
|
return(0); |
| 114 |
< |
/* jitter query direction */ |
| 115 |
< |
bsdf_jitter(vjit, ndp, 0); |
| 116 |
< |
/* avoid indirect over-counting */ |
| 117 |
< |
if (ndp->thru_r2 > FTINY && vsrc[2] > 0 ^ vjit[2] > 0) { |
| 118 |
< |
double dx = vsrc[0] + vjit[0]; |
| 119 |
< |
double dy = vsrc[1] + vjit[1]; |
| 116 |
< |
if (dx*dx + dy*dy <= ndp->thru_r2) |
| 114 |
> |
/* check indirect over-counting */ |
| 115 |
> |
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) |
| 116 |
> |
&& vsrc[2] > 0 ^ ndp->vray[2] > 0) { |
| 117 |
> |
double dx = vsrc[0] + ndp->vray[0]; |
| 118 |
> |
double dy = vsrc[1] + ndp->vray[1]; |
| 119 |
> |
if (dx*dx + dy*dy <= omega*(1./PI)) |
| 120 |
|
return(0); |
| 121 |
|
} |
| 122 |
< |
ec = SDevalBSDF(&sv, vjit, vsrc, ndp->sd); |
| 122 |
> |
/* get local BSDF resolution */ |
| 123 |
> |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
| 124 |
|
if (ec) |
| 125 |
< |
objerror(ndp->mp, USER, transSDError(ec)); |
| 126 |
< |
|
| 127 |
< |
if (sv.cieY <= FTINY) /* not worth using? */ |
| 128 |
< |
return(0); |
| 129 |
< |
/* else we're good to go */ |
| 130 |
< |
cvt_sdcolor(cval, &sv); |
| 131 |
< |
return(1); |
| 125 |
> |
goto baderror; |
| 126 |
> |
/* assign number of samples */ |
| 127 |
> |
if (tomega <= omega*.02) |
| 128 |
> |
nsamp = 50; |
| 129 |
> |
else |
| 130 |
> |
nsamp = 2.*omega/tomega + 1.; |
| 131 |
> |
sf = sqrt(omega); |
| 132 |
> |
setcolor(cval, .0, .0, .0); /* sample our source area */ |
| 133 |
> |
for (i = nsamp; i--; ) { |
| 134 |
> |
VCOPY(vsmp, vsrc); /* jitter query directions */ |
| 135 |
> |
if (nsamp > 1) { |
| 136 |
> |
multisamp(sd, 2, (i + frandom())/(double)nsamp); |
| 137 |
> |
vsmp[0] += (sd[0] - .5)*sf; |
| 138 |
> |
vsmp[1] += (sd[1] - .5)*sf; |
| 139 |
> |
if (normalize(vsmp) == 0) { |
| 140 |
> |
--nsamp; |
| 141 |
> |
continue; |
| 142 |
> |
} |
| 143 |
> |
} |
| 144 |
> |
bsdf_jitter(vjit, ndp, 0); |
| 145 |
> |
/* compute BSDF */ |
| 146 |
> |
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
| 147 |
> |
if (ec) |
| 148 |
> |
goto baderror; |
| 149 |
> |
if (sv.cieY <= FTINY) /* worth using? */ |
| 150 |
> |
continue; |
| 151 |
> |
cvt_sdcolor(csmp, &sv); |
| 152 |
> |
addcolor(cval, csmp); /* average it in */ |
| 153 |
> |
++ok; |
| 154 |
> |
} |
| 155 |
> |
sf = 1./(double)nsamp; |
| 156 |
> |
scalecolor(cval, sf); |
| 157 |
> |
return(ok); |
| 158 |
> |
baderror: |
| 159 |
> |
objerror(ndp->mp, USER, transSDError(ec)); |
| 160 |
|
} |
| 161 |
|
|
| 162 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
| 200 |
|
/* |
| 201 |
|
* Compute scattering coefficient using BSDF. |
| 202 |
|
*/ |
| 203 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
| 203 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
| 204 |
|
return; |
| 205 |
|
if (ldot > 0) { /* pattern only diffuse reflection */ |
| 206 |
|
COLOR ctmp1, ctmp2; |
| 255 |
|
/* |
| 256 |
|
* Compute reflection coefficient using BSDF. |
| 257 |
|
*/ |
| 258 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
| 258 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
| 259 |
|
return; |
| 260 |
|
/* pattern only diffuse reflection */ |
| 261 |
|
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
| 304 |
|
/* |
| 305 |
|
* Compute scattering coefficient using BSDF. |
| 306 |
|
*/ |
| 307 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
| 307 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
| 308 |
|
return; |
| 309 |
|
/* full pattern on transmission */ |
| 310 |
|
multcolor(ctmp, np->pr->pcol); |
| 516 |
|
if (!ec) |
| 517 |
|
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, |
| 518 |
|
SDqueryMin+SDqueryMax, nd.sd); |
| 487 |
– |
nd.thru_r2 = .0; |
| 488 |
– |
if (!ec && nd.thick != 0 && r->crtype & (SPECULAR|AMBIENT)) { |
| 489 |
– |
FVECT vthru; |
| 490 |
– |
vthru[0] = -nd.vray[0]; |
| 491 |
– |
vthru[1] = -nd.vray[1]; |
| 492 |
– |
vthru[2] = -nd.vray[2]; |
| 493 |
– |
ec = SDsizeBSDF(&nd.thru_r2, nd.vray, vthru, |
| 494 |
– |
SDqueryMin, nd.sd); |
| 495 |
– |
nd.thru_r2 *= 1./PI; |
| 496 |
– |
} |
| 519 |
|
if (ec) { |
| 520 |
|
objerror(m, WARNING, transSDError(ec)); |
| 521 |
|
SDfreeCache(nd.sd); |
