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;
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;
return(true);
}
}
return(false);
}
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);
}