public bool Hit(Ray ray, ref float t_min, ref float t_max, out Hit_record record)
{
record = new Hit_record();
Vector3 oc = ray.origin - center;
float a = Vector3.Dot(ray.direction, ray.direction);
float b = Vector3.Dot(oc, ray.direction);
float c = Vector3.Dot(oc, oc) - radius * radius;
float d = b * b - a * c;
if (d > 0)
{
float temp = (-b - Mathf.Sqrt(d)) / a;
if (temp < t_max && temp > t_min)
{
record.t = temp;
record.hitpoint = ray.GetPoint(temp);
record.normal = (record.hitpoint - center) / radius;
record.mat = mat;
return(true);
}
temp = (-b + Mathf.Sqrt(d)) / a;
if (temp < t_max && temp > t_min)
{
record.t = temp;
record.hitpoint = ray.GetPoint(temp);
record.normal = (record.hitpoint - center) / radius;
record.mat = mat;
return(true);
}
}
return(false);
}
public bool Scatter(ref Ray r, ref Hit_record rec, ref Vector3 attenuation, ref Ray scattered, System.Random seed)
{
Vector3 outward_normal = Vector3.zero;
Vector3 reflected = Vector3.Reflect(r.direction.normalized, rec.normal.normalized);
float ni_over_nt = 0f;
attenuation.x = 1.0f;
attenuation.y = 1.0f;
attenuation.z = 1.0f;
Vector3 refracted;
if (Vector3.Dot(r.direction, rec.normal) > 0)
{
outward_normal = -rec.normal;
ni_over_nt = ref_idx;
}
else
{
outward_normal = rec.normal;
ni_over_nt = 1.0f / ref_idx;
}
if (Refract(r.direction, outward_normal, ni_over_nt, out refracted))
{
scattered.origin = rec.hitpoint;
scattered.direction = refracted;
return(true);
}
else
{
scattered.origin = rec.hitpoint;
scattered.direction = reflected;
return(false);
}
}
public bool Scatter(ref Ray r, ref Hit_record rec, ref Vector3 attenuation, ref Ray scattered, System.Random seed)
{
Vector3 reflected = Vector3.Reflect(r.direction.normalized, rec.normal.normalized);
scattered.origin = rec.hitpoint;
scattered.direction = reflected;
attenuation = albedo;
return(Vector3.Dot(scattered.direction, rec.normal) > 0);
}
public bool Scatter(ref Ray r, ref Hit_record rec, ref Vector3 attenuation, ref Ray scattered, System.Random seed)
{
Vector3 target = rec.normal.normalized * 0.5f +
new Vector3(Chapter12.RandomFloat11(seed), Chapter12.RandomFloat11(seed), Chapter12.RandomFloat11(seed)).normalized;
scattered.origin = rec.hitpoint;
scattered.direction = target;
attenuation = albedo;
return(true);
}
public bool Scatter(ref Ray r, ref Hit_record rec, ref Vector3 attenuation, ref Ray scattered, System.Random seed)
{
Vector3 outward_normal = Vector3.zero;
Vector3 reflected = Vector3.Reflect(r.direction.normalized, rec.normal.normalized);
float ni_over_nt = 0f;
attenuation.x = 1.0f;
attenuation.y = 1.0f;
attenuation.z = 1.0f;
Vector3 refracted;
float reflect_prob;
float cosine;
if (Vector3.Dot(r.direction, rec.normal) > 0)
{
outward_normal = -rec.normal;
ni_over_nt = ref_idx;
cosine = ref_idx * Vector3.Dot(r.direction, rec.normal) / r.direction.magnitude;
}
else
{
outward_normal = rec.normal;
ni_over_nt = 1.0f / ref_idx;
cosine = -Vector3.Dot(r.direction.normalized, rec.normal) / r.direction.magnitude;
}
var bRefracted = Refract(r.direction, outward_normal, ni_over_nt, out refracted);
if (bRefracted)
{
reflect_prob = Schlick(cosine, ref_idx);
}
else
{
scattered.origin = rec.hitpoint;
scattered.direction = reflected;
reflect_prob = 1.0f;
}
if (Chapter12.RandomFloat01(seed) < reflect_prob)
{
scattered.origin = rec.hitpoint;
scattered.direction = reflected;
}
else
{
scattered.origin = rec.hitpoint;
scattered.direction = refracted;
}
return(true);
}
public bool Hit(Ray r, ref float t_min, ref float t_max, out Hit_record record)
{
Hit_record temp_rec = new Hit_record();
record = temp_rec;
bool hit_anything = false;
float closest_so_far = t_max;
for (int i = 0; i < list.Count; ++i)
{
if (list[i].Hit(r, ref t_min, ref closest_so_far, out temp_rec))
{
hit_anything = true;
closest_so_far = temp_rec.t;
record = temp_rec;
}
}
return(hit_anything);
}