public override bool Hit(Ray ray, float tMin, float tMax, out RayHit hit)
{
var oc = ray.Origin - Center;
var a = ray.Dir.LengthSquared;
var halfB = 2 * Vector3.Dot(oc, ray.Dir);
var c = oc.LengthSquared - (Radius * Radius);
float discriminant = (halfB * halfB) - (4 * (a * c));
if (discriminant < Utils.Epsilon)
{
hit = new RayHit();
return(false);
}
float tmp = MathF.Sqrt(discriminant);
float t = (-halfB - tmp) / (2 * a);
if (t > tMin && t < tMax)
{
Vector3 position = ray.PointAt(t);
Vector3 normal = (position - Center) / Radius;
hit = new RayHit(position, t, this);
hit.SetNormal(ray, normal);
return(true);
}
t = (-halfB + tmp) / (2 * a);
if (t > tMin && t < tMax)
{
Vector3 position = ray.PointAt(t);
Vector3 normal = (position - Center) / Radius;
hit = new RayHit(position, t, this);
hit.SetNormal(ray, -normal);
return(true);
}
hit = new RayHit();
return(false);
}
public override bool Hit(Ray ray, float tMin, float tMax, out RayHit hit)
{
hit = new RayHit();
for (int i = 0; i < Faces.Count; i++)
{
float denom = Vector3.Dot(ray.Dir, Faces[i].Normal);
if (denom < -Utils.Epsilon) // denom can't be 0
{
float t = (Vector3.Dot(Faces[i].PointInPlane - ray.Origin, Faces[i].OriginalNormal)) / denom;
if (t > tMin && t < tMax)
{
hit = new RayHit(ray.PointAt(t), t, this);
hit.SetNormal(ray, Faces[i].Normal.Normalized());
return(true);
}
}
}
return(false);
}