12 |
|
|
13 |
|
#include "ray.h" |
14 |
|
|
15 |
+ |
#include "otypes.h" |
16 |
+ |
|
17 |
|
/* |
18 |
|
* This definition of glass provides for a quick calculation |
19 |
|
* using a single surface where two closely spaced parallel |
26 |
|
* modifier glass id |
27 |
|
* 0 |
28 |
|
* 0 |
29 |
< |
* 3 red grn blu |
29 |
> |
* 3+ red grn blu [refractive_index] |
30 |
|
* |
31 |
|
* The color is used for the transmission at normal incidence. |
32 |
< |
* To compute transmission (tn) from transmissivity (Tn) use: |
32 |
> |
* To compute transmissivity (tn) from transmittance (Tn) use: |
33 |
|
* |
34 |
|
* tn = (sqrt(.8402528435+.0072522239*Tn*Tn)-.9166530661)/.0036261119/Tn |
35 |
|
* |
36 |
< |
* The transmission of standard 88% transmissivity glass is 0.96. |
36 |
> |
* The transmissivity of standard 88% transmittance glass is 0.96. |
37 |
|
* A refractive index other than the default can be used by giving |
38 |
|
* it as the fourth real argument. The above formula no longer applies. |
39 |
|
* |
53 |
|
FVECT pnorm; |
54 |
|
double rindex, cos2; |
55 |
|
COLOR trans, refl; |
56 |
+ |
int hastexture; |
57 |
|
double d, r1e, r1m; |
58 |
|
double transtest, transdist; |
59 |
+ |
double mirtest, mirdist; |
60 |
|
RAY p; |
61 |
|
register int i; |
62 |
|
/* check arguments */ |
71 |
|
|
72 |
|
if (r->rod < 0.0) /* reorient if necessary */ |
73 |
|
flipsurface(r); |
74 |
< |
transtest = 0; |
74 |
> |
mirtest = transtest = 0; |
75 |
> |
mirdist = transdist = r->rot; |
76 |
|
/* get modifiers */ |
77 |
|
raytexture(r, m->omod); |
78 |
< |
pdot = raynormal(pnorm, r); |
78 |
> |
if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) |
79 |
> |
pdot = raynormal(pnorm, r); |
80 |
> |
else { |
81 |
> |
VCOPY(pnorm, r->ron); |
82 |
> |
pdot = r->rod; |
83 |
> |
} |
84 |
|
/* angular transmission */ |
85 |
|
cos2 = sqrt( (1.0-1.0/(rindex*rindex)) + |
86 |
|
pdot*pdot/(rindex*rindex) ); |
101 |
|
} |
102 |
|
/* transmitted ray */ |
103 |
|
if (rayorigin(&p, r, TRANS, bright(trans)) == 0) { |
104 |
< |
if (!(r->crtype & SHADOW) && |
95 |
< |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
104 |
> |
if (!(r->crtype & SHADOW) && hastexture) { |
105 |
|
for (i = 0; i < 3; i++) /* perturb direction */ |
106 |
|
p.rdir[i] = r->rdir[i] + |
107 |
|
2.*(1.-rindex)*r->pert[i]; |
121 |
|
transdist = r->rot + p.rt; |
122 |
|
} |
123 |
|
|
124 |
< |
if (r->crtype & SHADOW) /* skip reflected ray */ |
125 |
< |
return; |
124 |
> |
if (r->crtype & SHADOW) { /* skip reflected ray */ |
125 |
> |
r->rt = transdist; |
126 |
> |
return(1); |
127 |
> |
} |
128 |
|
/* compute reflectance */ |
129 |
|
for (i = 0; i < 3; i++) { |
130 |
|
d = colval(mcolor, i); |
139 |
|
rayvalue(&p); |
140 |
|
multcolor(p.rcol, refl); |
141 |
|
addcolor(r->rcol, p.rcol); |
142 |
+ |
if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
143 |
+ |
mirtest = 2.0*bright(p.rcol); |
144 |
+ |
mirdist = r->rot + p.rt; |
145 |
+ |
} |
146 |
|
} |
147 |
< |
if (transtest > bright(r->rcol)) |
147 |
> |
/* check distance */ |
148 |
> |
d = bright(r->rcol); |
149 |
> |
if (transtest > d) |
150 |
|
r->rt = transdist; |
151 |
+ |
else if (mirtest > d) |
152 |
+ |
r->rt = mirdist; |
153 |
+ |
return(1); |
154 |
|
} |