public bool Hit(Ray ray, float tMin, float tMax, ref HitRecord hitRecord)
{
var currentCenter = Center(ray.Time);
Vector3 oc = ray.Origin - currentCenter;
var a = ray.Direction.LengthSquared();
var halfB = Vector3.Dot(oc, ray.Direction);
var c = oc.LengthSquared() - Radius * Radius;
float discriminant = halfB * halfB - a * c;
if (discriminant < 0.0f)
{
return(false);
}
// Find the nearest root that lies in the acceptable range.
float sqrtD = MathF.Sqrt(discriminant);
float root = (-halfB - sqrtD) / a;
if (root < tMin || root > tMax)
{
root = (-halfB + sqrtD) / a;
if (root < tMin || root > tMax)
{
return(false);
}
}
hitRecord.T = root;
hitRecord.Point = ray.At(hitRecord.T);
var outwardNormal = (hitRecord.Point - currentCenter) / Radius;
hitRecord.SetFaceNormal(ray, outwardNormal);
hitRecord.Material = _material;
return(true);
}
public bool Hit(Ray r, double tMin, double tMax, HitRecord record)
{
Vector3 oc = r.Origin - Center;
double a = r.Direction.LengthSquared();
double halfB = oc.Dot(r.Direction);
double c = oc.LengthSquared() - Radius * Radius;
double discriminant = halfB * halfB - a * c;
if (discriminant < 0)
{
return(false);
}
double sqrtDiscriminant = Math.Sqrt(discriminant);
// Find the nearest root that lies in the acceptable range
double root = (-halfB - sqrtDiscriminant) / a;
if (root < tMin || tMax < root)
{
root = (-halfB + sqrtDiscriminant) / a;
if (root < tMin || tMax < root)
{
return(false);
}
}
record.T = root;
record.Point = r.At(record.T);
record.Normal = (record.Point - Center) / Radius;
Vector3 outwardNormal = (record.Point - Center) / Radius;
record.SetFaceNormal(r, outwardNormal);
record.Material = Material;
return(true);
}
