public bool Hit(Ray ray, float min, float max, out HitRecord record)
{
HitRecord nearestRecord = null;
foreach (var h in _hitables)
{
HitRecord tempr;
if (h.Hit(ray, min, max, out tempr))
{
if (nearestRecord == null || nearestRecord.t > tempr.t)
{
nearestRecord = tempr;
}
}
}
record = nearestRecord;
return(nearestRecord != null);
}
public bool Scatter(Ray ray, HitRecord hitRecord, out ScatterRecord sRecord)
{
sRecord = new ScatterRecord();
var normal = hitRecord.normal;
var point = hitRecord.point;
sRecord.attenuation = new vec3(1.0f, 1.0f, 1.0f);
float eta = ref_idx;
var n = normal;
if (glm.dot(ray.direction, normal) > 0)//从内到外
{
n = new vec3(-normal.x, -normal.y, -normal.z);
}
else
{
eta = 1.0f / eta;
}
vec3 r;
float prob = 1.0f;
if (Exten.refract(ray.direction, n, eta, out r))
{
float cosi = -glm.dot(ray.direction, n);
float cost = -glm.dot(r, n);
prob = fresnel(cosi, cost, eta);
}
if (Exten.rand01() < prob)
{
vec3 reflected = Exten.reflect(ray.direction, normal);
sRecord.pdf = new ConstPDF(reflected);
}
else
{
sRecord.pdf = new ConstPDF(r);
}
return true;
}
public bool Hit(Ray ray, float min, float max, out HitRecord r)
{
return(_sideList.Hit(ray, min, max, out r));
}
public vec3 Emitted(Ray ray, HitRecord hitRecord, float u, float v, vec3 pos)
{
return new vec3(0, 0, 0);
}
public float Scatter_PDf(Ray ray, HitRecord hitRecord, Ray scattered)
{
return 1;
}
public bool Scatter(Ray ray, HitRecord hitRecord, out ScatterRecord sRecord)
{
sRecord = null;
return false;
}
public float Scatter_PDf(Ray ray, HitRecord hitRecord, Ray scattered)
{
return glm.dot(hitRecord.normal, scattered.direction) /MathF.PI;
}
