| 41 |
|
#define RINDEX 1.52 /* refractive index of glass */ |
| 42 |
|
|
| 43 |
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|
| 44 |
< |
extern int |
| 44 |
> |
int |
| 45 |
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m_glass( /* color a ray which hit a thin glass surface */ |
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OBJREC *m, |
| 47 |
< |
register RAY *r |
| 47 |
> |
RAY *r |
| 48 |
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) |
| 49 |
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{ |
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COLOR mcolor; |
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double pdot; |
| 52 |
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FVECT pnorm; |
| 53 |
< |
double rindex, cos2; |
| 53 |
> |
double rindex=0, cos2; |
| 54 |
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COLOR trans, refl; |
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int hastexture, hastrans; |
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double d, r1e, r1m; |
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double transtest, transdist; |
| 58 |
|
double mirtest, mirdist; |
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RAY p; |
| 60 |
< |
register int i; |
| 60 |
> |
int i; |
| 61 |
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/* check arguments */ |
| 62 |
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if (m->oargs.nfargs == 3) |
| 63 |
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rindex = RINDEX; /* default value of n */ |
| 65 |
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rindex = m->oargs.farg[3]; /* use their value */ |
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else |
| 67 |
|
objerror(m, USER, "bad arguments"); |
| 68 |
+ |
/* check back face visibility */ |
| 69 |
+ |
if (!backvis && r->rod <= 0.0) { |
| 70 |
+ |
raytrans(r); |
| 71 |
+ |
return(1); |
| 72 |
+ |
} |
| 73 |
|
/* check transmission */ |
| 74 |
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setcolor(mcolor, m->oargs.farg[0], m->oargs.farg[1], m->oargs.farg[2]); |
| 75 |
|
if ((hastrans = (intens(mcolor) > 1e-15))) { |
| 116 |
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multcolor(trans, r->pcol); /* modify by pattern */ |
| 117 |
|
/* transmitted ray */ |
| 118 |
|
if (rayorigin(&p, TRANS, r, trans) == 0) { |
| 119 |
< |
if (!(r->crtype & SHADOW) && hastexture) { |
| 120 |
< |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 116 |
< |
p.rdir[i] = r->rdir[i] + |
| 117 |
< |
2.*(1.-rindex)*r->pert[i]; |
| 119 |
> |
if (!(r->crtype & (SHADOW|AMBIENT)) && hastexture) { |
| 120 |
> |
VSUM(p.rdir, r->rdir, r->pert, 2.*(1.-rindex)); |
| 121 |
|
if (normalize(p.rdir) == 0.0) { |
| 122 |
|
objerror(m, WARNING, "bad perturbation"); |
| 123 |
|
VCOPY(p.rdir, r->rdir); |
| 146 |
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} |
| 147 |
|
/* reflected ray */ |
| 148 |
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if (rayorigin(&p, REFLECTED, r, refl) == 0) { |
| 149 |
< |
for (i = 0; i < 3; i++) |
| 150 |
< |
p.rdir[i] = r->rdir[i] + 2.0*pdot*pnorm[i]; |
| 149 |
> |
VSUM(p.rdir, r->rdir, pnorm, 2.*pdot); |
| 150 |
> |
checknorm(p.rdir); |
| 151 |
|
rayvalue(&p); |
| 152 |
|
multcolor(p.rcol, p.rcoef); |
| 153 |
|
addcolor(r->rcol, p.rcol); |
| 154 |
< |
if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
| 154 |
> |
if (r->ro != NULL && isflat(r->ro->otype) && |
| 155 |
> |
!hastexture | (r->crtype & AMBIENT)) { |
| 156 |
|
mirtest = 2.0*bright(p.rcol); |
| 157 |
|
mirdist = r->rot + p.rt; |
| 158 |
|
} |
