Bidirectional Path Tracing using Nvidia Optix , Part 3 (Simple Refractions)

Hello !

Today i managed to create the first simple refractions into my project.The refractions are far from finished yet but i think they are good enough to show them to you. As you can see i have also implemented spherical lights

The material has refractions only , without anything else and it is also simple ,without any tricks yet.

_____________________________________________________________________
SAMPLE CODE :


 //refraction coefficient


current_prd.countEmitted = true;
float ior = 0.0;
 if(!current_prd.inside)
ior=1.33;
 else
ior=1/1.33;

if(refract(current_prd.direction, ray.direction, ffnormal, ior))
{
if(current_prd.inside)
{
current_prd.cos1 = dot( -ffnormal, -ray.direction );
current_prd.cos2 = dot( ffnormal, current_prd.direction );
}
else
{
current_prd.cos1 = dot( ffnormal, -ray.direction );
current_prd.cos2 = dot( -ffnormal, current_prd.direction );
}

}
else//internal reflection
{
current_prd.direction = reflect(ray.direction,- ffnormal);

current_prd.cos1 = dot( -ffnormal, -ray.direction );
current_prd.cos2 = dot(- ffnormal, current_prd.direction );
}


current_prd.attenuation = diffuse_color*Kt;

if(current_prd.inside)
{
 //Compute Beer's law
current_prd.attenuation = current_prd.attenuation * powf( diffuse_color , t_hit);
}

current_prd.inside = !current_prd.inside;

current_prd.hitDistance =   length(ray.origin - hitpoint);
current_prd.ffnormal = ffnormal;

 _________________________________________

Please , i need your comments to make it better and find any mistakes that i make !

Render 2