49 |
|
FVECT pnorm; |
50 |
|
double cos2; |
51 |
|
COLOR trans, refl; |
52 |
< |
double d, r1; |
52 |
> |
double d, r1e, r1m; |
53 |
|
double transtest, transdist; |
54 |
|
RAY p; |
55 |
|
register int i; |
73 |
|
pow(colval(mcolor,BLU), 1.0/cos2)); |
74 |
|
|
75 |
|
/* compute reflection */ |
76 |
< |
r1 = (pdot - RINDEX*cos2) / (pdot + RINDEX*cos2); |
77 |
< |
d = (1.0/pdot - RINDEX/cos2) / (1.0/pdot + RINDEX/cos2); |
78 |
< |
r1 = (r1*r1 + d*d) / 2.0; |
76 |
> |
r1e = (pdot - RINDEX*cos2) / (pdot + RINDEX*cos2); |
77 |
> |
r1e *= r1e; |
78 |
> |
r1m = (1.0/pdot - RINDEX/cos2) / (1.0/pdot + RINDEX/cos2); |
79 |
> |
r1m *= r1m; |
80 |
|
/* compute transmittance */ |
81 |
|
for (i = 0; i < 3; i++) { |
82 |
|
d = colval(mcolor, i); |
83 |
< |
colval(trans,i) = (1.0-r1)*(1.0-r1)*d / (1.0 - r1*r1*d*d); |
83 |
> |
colval(trans,i) = .5*(1.0-r1e)*(1.0-r1e)*d/(1.0-r1e*r1e*d*d); |
84 |
> |
colval(trans,i) += .5*(1.0-r1m)*(1.0-r1m)*d/(1.0-r1m*r1m*d*d); |
85 |
|
} |
86 |
|
/* transmitted ray */ |
87 |
|
if (rayorigin(&p, r, TRANS, bright(trans)) == 0) { |
108 |
|
for (i = 0; i < 3; i++) { |
109 |
|
d = colval(mcolor, i); |
110 |
|
d *= d; |
111 |
< |
colval(refl,i) = r1 * (1.0 + (1.0-2.0*r1)*d) / (1.0 - r1*r1*d); |
111 |
> |
colval(refl,i) = .5*r1e*(1.0+(1.0-2.0*r1e)*d)/(1.0-r1e*r1e*d); |
112 |
> |
colval(refl,i) += .5*r1m*(1.0+(1.0-2.0*r1m)*d)/(1.0-r1m*r1m*d); |
113 |
|
} |
114 |
|
/* reflected ray */ |
115 |
|
if (rayorigin(&p, r, REFLECTED, bright(refl)) == 0) { |