public bool Hit(Ray r, double tMin, double tMax, out HitRecord hr)
{
var t = (K - r.Origin.z) / r.Dir.z;
if (t < tMin || t > tMax)
{
hr = default(HitRecord);
return(false);
}
var x = r.Origin.x + t * r.Dir.x;
var y = r.Origin.y + t * r.Dir.y;
if (x < X0 || x > X1 || y < Y0 || y > Y1)
{
hr = default;
return(false);
}
var u = (x - X0) / (X1 - X0);
var v = (y - Y0) / (Y1 - Y0);
var outwardNormal = new Vec3(0, 0, 1);
hr = new HitRecord
{
T = t,
Point = r.At(t),
Material = Mp,
U = u,
V = v
};
hr.SetFaceNormal(r, outwardNormal);
return(true);
}
public bool Hit(Ray r, double tMin, double tMax, out HitRecord hr)
{
var origin = r.Origin;
var dir = r.Dir;
origin[0] = CosTheta * r.Origin[0] - SinTheta * r.Origin[2];
origin[2] = SinTheta * r.Origin[0] + CosTheta * r.Origin[2];
dir[0] = CosTheta * r.Dir[0] - SinTheta * r.Dir[2];
dir[2] = SinTheta * r.Dir[0] + CosTheta * r.Dir[2];
var rotatedRay = new Ray(origin, dir, r.Time);
if (!Child.Hit(rotatedRay, tMin, tMax, out hr))
{
return(false);
}
var p = hr.Point;
var normal = hr.Normal;
p[0] = CosTheta * hr.Point[0] + SinTheta * hr.Point[2];
p[2] = -SinTheta * hr.Point[0] + CosTheta * hr.Point[2];
normal[0] = CosTheta * hr.Normal[0] + SinTheta * hr.Normal[2];
normal[2] = -SinTheta * hr.Normal[0] + CosTheta * hr.Normal[2];
hr.Point = p;
hr.SetFaceNormal(rotatedRay, normal);
return(true);
}
public bool Hit(Ray r, double tMin, double tMax, out HitRecord hr)
{
var movedRay = new Ray(r.Origin - Offset, r.Dir, r.Time);
if (!Child.Hit(movedRay, tMin, tMax, out hr))
{
return(false);
}
hr.Point += Offset;
hr.SetFaceNormal(movedRay, hr.Normal);
return(true);
}
public bool Hit(Ray r, double tMin, double tMax, out HitRecord hitRec)
{
var center = CenterForTime(r.Time);
var oc = r.Origin - center;
var a = r.Dir.LengthSquared;
var halfB = Vec3.Dot(oc, r.Dir);
var c = oc.LengthSquared - Radius * Radius;
var disc = halfB * halfB - a * c;
if (disc < 0)
{
hitRec = default(HitRecord);
return(false);
}
var sqrtd = Math.Sqrt(disc);
var root = (-halfB - sqrtd) / a;
if (root < tMin || tMax < root)
{
root = (-halfB + sqrtd) / a;
if (root < tMin || tMax < root)
{
hitRec = default(HitRecord);
return(false);
}
}
var t = root;
var point = r.At(t);
var outwardNormal = (point - center) / Radius;
Sphere.GetSphereUV(outwardNormal, out var u, out var v);
hitRec = new HitRecord
{
T = t,
Point = point,
Material = Material,
U = u,
V = v
};
hitRec.SetFaceNormal(r, outwardNormal);
return(true);
}
