private static Colour RayColour(Ray r, Hittable world, int depth)
{
// If we've exceeded the ray bounce limit, no more light is gathered.
if (depth <= 0)
{
return(Colour.Zero);
}
HitRecord rec = new HitRecord();
if (world.Hit(r, 0.001f, float.PositiveInfinity, ref rec))
{
Ray scattered = new Ray();
Colour attenuation = new Colour();
if (rec.Mat.Scatter(ref r, ref rec, ref attenuation, ref scattered))
{
return(attenuation * RayColour(scattered, world, depth - 1));
}
return(Colour.Zero);
}
Vector3 unitDirection = Vector3.Normalize(r.Direction);
float t = 0.5f * (unitDirection.Y + 1f);
return((1f - t) * Colour.One + t * new Colour(0.5f, 0.7f, 1.0f));
}
public void Add(Hittable h)
{
hittables.Add(h);
}