public override bool Intersect(Ray ray, ref DifferentialGeometry dg)
{
float A = ray.d.x * ray.d.x + ray.d.y * ray.d.y + ray.d.z * ray.d.z;
float B = 2 * (ray.d.x * ray.o.x + ray.d.y * ray.o.y + ray.d.z * ray.o.z);
float C = ray.o.x * ray.o.x + ray.o.y * ray.o.y +
ray.o.z * ray.o.z - radius * radius;
float[] t;
if (!LR.Quadratic(A, B, C, out t))
{
return(false);
}
if (t[0] > ray.maxt || t[1] < ray.mint)
{
return(false);
}
float thit = t[0];
if (t[0] < ray.mint)
{
thit = t[1];
if (thit > ray.maxt)
{
return(false);
}
}
return(true);
}