public void shade(SceneObject ClosestObj, Ray TheRay, Vector3D Normal, Vector3D Point, Color col)
{
// If no intersection just return. A small optimisation.
if (ClosestObj == null)
{
return;
}
double K, Ambient, Diffuse, Specular, DistanceT;
Ray LightRay = new Ray();
Ray ReflectedRay = new Ray();
double Red, Green, Blue; // Working RGB values.. need to be onverted to a CColour later.
int NumLights; //
LightSource Light;
K = Vector3D.DotProduct(TheRay.direction, Normal); /// Dot product of the ray and the objects normal.
K *= 2.0;
// Reflect ray (obviousily) starts at the intersection point.
ReflectedRay.origin = Point;
ReflectedRay.direction = new Vector3D(K * Normal.X + TheRay.direction.X,
K * Normal.Y + TheRay.direction.Y,
K * Normal.Z + TheRay.direction.Z
);
Ambient = ClosestObj.properties.Ambient;
Red = ClosestObj.properties.Colour.R * Ambient;
Green = ClosestObj.properties.Colour.G * Ambient;
Blue = ClosestObj.properties.Colour.B * Ambient;
// Iterate thru a Light list.
// DEBUG for now use a bogus one.
Light = new LightSource(new Vector3D(65, -50, -100));
Light.SetColour(Color.FromArgb(255, 255, 255));
NumLights = lightSources.Count();
if (Light != null)
{
Color LightColour;
DistanceT = Light.MakeLightRay(Point, LightRay);
if (RecurseLevel == 0)
{
LightColour = Light.getColour(ClosestObj, LightRay, DistanceT, sceneObjects);
}
else
{
LightColour = Light.properties.Colour;
}
if ((LightColour.R == 0.0) || (LightColour.G == 0.0) || (LightColour.B == 0.0))
{
col = Color.FromArgb(0, 0, 0);
return;
}
else
{
Diffuse = Vector3D.DotProduct(Normal, LightRay.direction); // Dot Product
if ((Diffuse > 0.0) && (ClosestObj.properties.Diffuse > 0.0))
{
Diffuse = Math.Pow(Diffuse, ClosestObj.properties.Brilliance) * ClosestObj.properties.Diffuse;
Red += LightColour.R * ClosestObj.properties.Colour.R * Diffuse;
Green += LightColour.G * ClosestObj.properties.Colour.G * Diffuse;
Blue += LightColour.B * ClosestObj.properties.Colour.B * Diffuse;
}
ReflectedRay.direction.Normalize(); //
Specular = Vector3D.DotProduct(ReflectedRay.direction, LightRay.direction); // Dot product..
if ((Specular > 0.0) && (ClosestObj.properties.Specular > 0.0))
{
Specular = Math.Pow(Specular, ClosestObj.properties.Roughness) * ClosestObj.properties.Roughness;
Red += LightColour.R * Specular;
Green += LightColour.G * Specular;
Blue += LightColour.B * Specular;
}
// Reflection ..
K = ClosestObj.properties.Reflection;
if (K > 0.0)
{
Color NewColour = new Color();
RecurseLevel++;
trace(ReflectedRay, NewColour); // Recursive..
Red += NewColour.R * K;
Green += NewColour.G * K;
Blue += NewColour.B * K;
RecurseLevel--;
}
}
}
// Convert 1.0 to 255
col = Color.FromArgb(Convert.ToByte(Red * 255), Convert.ToByte(Green * 255), Convert.ToByte(Blue * 255));
Console.WriteLine("col = " + col.ToString());
}