public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
shadeRec = new ShadeRec(); shadeRec.IsHit = false;
double t = (k - ray.Origin.Y) / ray.Direction.Y;
if (t < tMin || t > tMax)
{
return(false);
}
double x = ray.Origin.X + t * ray.Direction.X;
double z = ray.Origin.Z + t * ray.Direction.Z;
if (x < x0 || x > x1 || z < z0 || z > z1)
{
return(false);
}
shadeRec.IsHit = true;
shadeRec.U = (z - z0) / (z1 - z0);
shadeRec.V = (x - x0) / (x1 - x0);
shadeRec.HitT = t;
shadeRec.HitObjGloMat = geoMat;
shadeRec.HitPoint = ray.getPointAtRay(t);
shadeRec.Normal = new Vector3D(0, 1, 0);
return(true);
}
public override bool Hit(Ray ray, double tMin, double tMax, out ShadeRec shadeRec)
{
ShadeRec rec1, rec2; shadeRec = new ShadeRec();
if (boundary.Hit(ray, -1e15, 1e15, out rec1))
{
if (boundary.Hit(ray, rec1.HitT + 1e-4, 1e15, out rec2))
{
if (rec1.HitT < tMin)
{
rec1.HitT = tMin;
}
if (rec2.HitT > tMax)
{
rec2.HitT = tMax;
}
if (rec1.HitT >= rec2.HitT)
{
return(false);
}
if (rec1.HitT < 0)
{
rec1.HitT = 0;
}
double distanceInsideBoundary = (rec2.HitT - rec1.HitT) * ray.Direction.Magnitude();
double hitDistance = -(1.0 / density) * Math.Log(Form2.random());
if (hitDistance < distanceInsideBoundary)
{
shadeRec.IsHit = true;
shadeRec.HitT = rec1.HitT + hitDistance / ray.Direction.Magnitude();
shadeRec.HitPoint = ray.getPointAtRay(shadeRec.HitT);
shadeRec.Normal = new Vector3D(Form2.random(), Form2.random(), Form2.random());
shadeRec.HitObjGloMat = phase_function;
return(true);
}
}
}
return(false);
}
