Exemple #1
0
        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);
        }
Exemple #2
0
        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);
        }