public bool Scatter(Ray ray, UnityEngine.Vector3 point, UnityEngine.Vector3 normal, out UnityEngine.Vector3 attenuation, out Ray scattered)
{
var reflected = Exten.reflect(ray.direction, normal);
if (fuzz > 0)
{
reflected = reflected + fuzz * Exten.RandomVecInSphere();
}
scattered = new Ray(point, reflected);
attenuation = color;
return(UnityEngine.Vector3.Dot(ray.direction, normal) < 0);
}
public bool Scatter(Ray ray, UnityEngine.Vector3 point, UnityEngine.Vector3 normal, out UnityEngine.Vector3 attenuation, out Ray scattered)
{
attenuation = new UnityEngine.Vector3(1.0f, 1.0f, 1.0f);
float eta = ref_idx;
var n = normal;
if (UnityEngine.Vector3.Dot(ray.direction, normal) > 0)//从内到外
{
n = new UnityEngine.Vector3(-normal.x, -normal.y, -normal.z);
}
else
{
eta = 1.0f / eta;
}
UnityEngine.Vector3 r;
float prob = 1.0f;
if (Exten.refract(ray.direction, n, eta, out r))
{
float cosi = -UnityEngine.Vector3.Dot(ray.direction, n);
float cost = -UnityEngine.Vector3.Dot(r, n);
prob = fresnel(cosi, cost, eta);
}
if (Exten.rand01() < prob)
{
UnityEngine.Vector3 reflected = Exten.reflect(ray.direction, normal);
scattered = new Ray(point, reflected);
}
else
{
scattered = new Ray(point, r);
}
return(true);
}
