Subversion Repositories gelsvn

Rev

Rev 349 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
353 awk 1 
#include "glass.h"
346 awk 2 
 
3 
using namespace CGLA;
4 
 
5 
glass::glass(const CGLA::Vec3f& c, float ior)
6 
: material(ior, 0.f), color_(c)
7 
{
8 
}
9 
 
10 
void glass::sample(const ray& r, hit_info& hi) const
11 
{
349 awk 12 
    hi.ior = hi.inside ? 1.f / ior_ : ior_;
346 awk 13 
 
349 awk 14 
    //compute fresnel
15 
    float f;
16 
    float cosi = dot(-r.direction, hi.shading_normal);
17 
    cosi = clamp(cosi, -1.f, 1.f);
18 
    float sint = 1.f / hi.ior * std::sqrt(std::max(0.f, 1.f - cosi*cosi));
346 awk 19 
 
349 awk 20 
    if (sint > 1.f)
21 
    {
22 
        //total internal reflection
23 
        f = 1.f;
24 
    }
25 
    else if (cosi < 0.)
26 
    {
27 
        f = 0.f;
28 
    }
29 
    else
30 
    {
31 
        float cost = std::sqrt(std::max(0.f, 1.f - sint * sint));
32 
        cost = clamp(cost, -1.f, 1.f);
33 
        f = fresnel_dielectric(cosi, cost, hi.ior);
346 awk 34 
 
349 awk 35 
        if (f < 0.f || f > 1.f)
36 
            assert(false);
37 
    }
38 
 
39 
    hi.reflection = f * color_;
40 
    hi.refraction = (1.f - f) * color_;
346 awk 41 
}
42 
 
43 
//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007