public bool Hit(Ray r, float t_min, float t_max, ref Hit_Record rec)
{
Vector3 oc = r.Origin - this.Center;
float a = r.Direction.LengthSquared();
float half_b = Vector3.Dot(oc, r.Direction);
float c = oc.LengthSquared() - this.Radius * this.Radius;
float discriminant = half_b * half_b - a * c;
if (discriminant > 0)
{
float root = (float)Math.Sqrt(discriminant);
float temp = (-half_b - root) / a;
if (temp < t_max && temp > t_min)
{
rec.T = temp;
rec.P = r.At(rec.T);
Vector3 outward_normal = (rec.P - this.Center) / this.Radius;
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = Material;
return(true);
}
temp = (-half_b + root) / a;
if (temp < t_max && temp > t_min)
{
rec.T = temp;
rec.P = r.At(rec.T);
Vector3 outward_normal = (rec.P - this.Center) / this.Radius;
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = Material;
return(true);
}
}
return(false);
}
public bool Hit(Ray r, float t_min, float t_max, ref Hit_Record rec)
{
Vector3 oc = r.Origin - this.Center(r.Time);
var a = r.Direction.LengthSquared();
var half_b = Vector3.Dot(oc, r.Direction);
var c = oc.LengthSquared() - radius * radius;
var discriminant = half_b * half_b - a * c;
if (discriminant > 0)
{
var root = (float)Math.Sqrt(discriminant);
var temp = (-half_b - root) / a;
if (temp < t_max && temp > t_min)
{
rec.T = temp;
rec.P = r.At(rec.T);
var outward_normal = (rec.P - this.Center(r.Time)) / radius;
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = mat_ptr;
return(true);
}
temp = (-half_b + root) / a;
if (temp < t_max && temp > t_min)
{
rec.T = temp;
rec.P = r.At(rec.T);
var outward_normal = (rec.P - this.Center(r.Time)) / radius;
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = mat_ptr;
return(true);
}
}
return(false);
}
