| 688 |
khor |
1 |
#include "plastic.h"
|
|
|
2 |
|
|
|
3 |
using namespace CGLA;
|
|
|
4 |
|
|
|
5 |
plastic::plastic(const CGLA::Vec3f& d, const CGLA::Vec3f& g, float s)
|
|
|
6 |
: material(1.6f, 0.f), diffuse_(d), glossy_(g), shininess_(s)
|
|
|
7 |
{
|
|
|
8 |
}
|
|
|
9 |
|
|
|
10 |
void plastic::sample(const ray& r, hit_info& hi) const
|
|
|
11 |
{
|
|
|
12 |
float cosi = dot(-r.direction, hi.shading_normal);
|
|
|
13 |
cosi = clamp(cosi, -1.f, 1.f);
|
|
|
14 |
if (cosi <= 0.f)
|
|
|
15 |
return;
|
|
|
16 |
float sint = 1.f / ior_ * std::sqrt(std::max(0.f, 1.f - cosi*cosi));
|
|
|
17 |
float cost = std::sqrt(std::max(0.f, 1.f - sint * sint));
|
|
|
18 |
cost = clamp(cost, -1.f, 1.f);
|
|
|
19 |
float f = fresnel_dielectric(cosi, cost, ior_);
|
|
|
20 |
|
|
|
21 |
hi.diffuse = diffuse_;
|
|
|
22 |
hi.glossy = f*glossy_;
|
|
|
23 |
hi.shininess = shininess_;
|
|
|
24 |
hi.ior = ior_;
|
|
|
25 |
}
|
|
|
26 |
|
|
|
27 |
//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007
|