/// <summary>
/// Lambertian shading
/// </summary>
/// <param name="p"></param>
/// <param name="l"></param>
/// <param name="ray"></param>
/// <returns></returns>
public Vector3D Phong(Vector3D p, Light l, Ray ray)
{
// Object color
Vector3D k = GetCheckerBoardColor(p);
// normal of object
Vector3D n = Normal(p);
// Diffuse shading
Vector3D diffuse = k * Math.Max(0, Vector3D.DotProduct(l.Position, n));
Vector3D v = (ray.E - p);
v.Normalize();
double p_phong = 128;
Vector3D h = v + l.Position;
h.Normalize();
// Reflection vector
Vector3D r = 2 * (Vector3D.DotProduct(n, v)) * n - v;
// Reflective color
Ray reflectionRay = new Ray(p, p - r);
Vector3D pPrime = reflectionRay.GetPoint3D(.005);
reflectionRay = new Raycast.Ray(pPrime, pPrime - r);
Vector3D lm = ColorOfReflection(new Ray(p, p - r), l);
Vector3D ls = k * Math.Pow(Math.Max(0, Vector3D.DotProduct(h, n)), p_phong);
return(diffuse + ls + lm);
}
public Vector3D Phong(Vector3D p, Light l, Ray ray)
{
double p_phong = 128;
Vector3D k = AlbedoColor;
if (image != null)
{
k = TextureColorAtPoint(p);
p_phong = 512;
}
// normal of object
Vector3D n = Normal(p);
// Diffuse shading
Vector3D diffuse = k * Math.Max(0, Vector3D.DotProduct(l.Position, n));
if (image != null)
{
return(diffuse);
}
Vector3D v = (ray.E - p);
v.Normalize();
// Direction of the bounced light
Vector3D h = v + l.Position;
h.Normalize();
// Reflection vector
Vector3D r = 2 * (Vector3D.DotProduct(n, v)) * n - v;
// Reflective color
Ray reflectionRay = new Ray(p, p - r);
Vector3D pPrime = reflectionRay.GetPoint3D(.005);
reflectionRay = new Raycast.Ray(pPrime, pPrime - r);
Vector3D lm = ColorOfReflection(new Ray(p, p - r), l);
Vector3D ls = k * Math.Pow(Math.Max(0, Vector3D.DotProduct(h, n)), p_phong);
return(diffuse + ls + lm);
}
