public bool Hit(Ray r, float t0, float t1, ref Hit_Record rec)
{
var t = (k - r.Origin.Z) / r.Direction.Z;
if (t < t0 || t > t1)
{
return(false);
}
var x = r.Origin.X + t * r.Direction.X;
var y = r.Origin.Y + t * r.Direction.Y;
if (x < x0 || x > x1 || y < y0 || y > y1)
{
return(false);
}
rec.U = (x - x0) / (x1 - x0);
rec.V = (y - y0) / (y1 - y0);
rec.T = t;
var outward_normal = new Vector3(0, 0, 1);
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = mp;
rec.P = r.At(t);
return(true);
}
public bool Hit(Ray r, float t0, float t1, ref Hit_Record rec)
{
var t = (k - r.Origin.X) / r.Direction.X;
if (t < t0 || t > t1)
{
return(false);
}
var y = r.Origin.Y + t * r.Direction.Y;
var z = r.Origin.Z + t * r.Direction.Z;
if (y < y0 || y > y1 || z < z0 || z > z1)
{
return(false);
}
rec.U = (y - y0) / (y1 - y0);
rec.V = (z - z0) / (z1 - z0);
rec.T = t;
var outward_normal = new Vector3(1, 0, 0);
rec.Set_Face_Normal(r, outward_normal);
rec.Mat_ptr = mp;
rec.P = r.At(t);
return(true);
}
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;
this.Get_sphere_uv((rec.P - this.Center) / this.Radius, out rec.U, out rec.V);
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;
this.Get_sphere_uv((rec.P - this.Center) / this.Radius, out rec.U, out rec.V);
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);
}
