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#include "copyright.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#include "source.h" |
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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "random.h" |
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#ifndef MAXITER |
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#define MAXITER 10 /* maximum # specular ray attempts */ |
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#endif |
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/* estimate of Fresnel function */ |
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#define FRESNE(ci) (exp(-6.0*(ci)) - 0.00247875217) |
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#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
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static void gaussamp(); |
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/* |
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* This routine implements the isotropic Gaussian |
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double pdot; /* perturbed dot product */ |
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} NORMDAT; /* normal material data */ |
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static srcdirf_t dirnorm; |
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static void gaussamp(RAY *r, NORMDAT *np); |
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static void |
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dirnorm(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register NORMDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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> |
dirnorm( /* compute source contribution */ |
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COLOR cval, /* returned coefficient */ |
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> |
void *nnp, /* material data */ |
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> |
FVECT ldir, /* light source direction */ |
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> |
double omega /* light source size */ |
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> |
) |
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{ |
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register NORMDAT *np = nnp; |
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double ldot; |
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double ldiff; |
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double dtmp, d2; |
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/* Fresnel estimate */ |
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ldiff = np->rdiff; |
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< |
if (np->specfl & SP_PURE && (np->rspec > FTINY & ldiff > FTINY)) |
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> |
if (np->specfl & SP_PURE && (np->rspec > FTINY) & (ldiff > FTINY)) |
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ldiff *= 1. - FRESNE(fabs(ldot)); |
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if (ldot > FTINY && ldiff > FTINY) { |
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} |
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int |
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m_normal(m, r) /* color a ray that hit something normal */ |
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register OBJREC *m; |
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register RAY *r; |
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> |
extern int |
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> |
m_normal( /* color a ray that hit something normal */ |
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> |
register OBJREC *m, |
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> |
register RAY *r |
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) |
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{ |
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NORMDAT nd; |
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double fest; |
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if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
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nd.specfl |= SP_PURE; |
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< |
if (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) { |
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if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) { |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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} else { |
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VCOPY(nd.pnorm, r->ron); |
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nd.pdot = r->rod; |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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} |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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if (nd.pdot < .001) |
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nd.pdot = .001; /* non-zero for dirnorm() */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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static void |
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< |
gaussamp(r, np) /* sample gaussian specular */ |
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< |
RAY *r; |
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< |
register NORMDAT *np; |
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> |
gaussamp( /* sample gaussian specular */ |
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> |
RAY *r, |
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> |
register NORMDAT *np |
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> |
) |
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{ |
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RAY sr; |
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FVECT u, v, h; |
