public override bool Scatter(RayComponent ray, ref HitInfo result, ref ScatterInfo info)
{
float fuzz = Value.fuzz;
Color albedo = Value.albedo;
Vector3 reflected = math.reflect(ray.Value.direction, result.normal);
info.direction = reflected + fuzz * RandomUtility.RandomInUnitSphere();
info.attenuation = albedo;
info.position = result.position;
return(false);
}
public override bool Scatter(RayComponent ray, ref HitInfo result, ref ScatterInfo scatterInfo)
{
scatterInfo.attenuation = Color.white;
scatterInfo.position = result.position;
float refIdx = Value.refractiveIndex;
float ni_over_nt;
Vector3 outwardNormal;
float cosine = math.dot(ray.Value.direction, result.normal);
if (cosine > 0.0f)
{
outwardNormal = -result.normal;
ni_over_nt = refIdx;
cosine = ni_over_nt * cosine / math.length(ray.Value.direction);
}
else
{
outwardNormal = result.normal;
ni_over_nt = 1.0f / refIdx;
cosine = -cosine / math.length(ray.Value.direction);
}
float reflectProb = 1.0f;
Vector3 refracted;
if (MathUtility.Refract(ray.Value.direction, outwardNormal, ni_over_nt, out refracted))
{
reflectProb = MathUtility.FresnelSchlick(cosine, refIdx);
}
if (RandomUtility.RandomNDF() < reflectProb)
{
scatterInfo.direction = math.reflect(ray.Value.direction, result.normal);
}
else
{
scatterInfo.direction = refracted;
}
return(true);
}
public virtual bool Scatter(RayComponent ray, ref HitInfo result, ref ScatterInfo info)
{
return(false);
}