public Color trace(Ray ray, int depth)
{
if (depth < 1)
{
return(new Color(Scene.Background.R, Scene.Background.G, Scene.Background.B));
}
Intersection?possibleIntersection = Scene.Intersect(ray);
if (!possibleIntersection.HasValue)
{
return(new Color(Scene.Background.R, Scene.Background.G, Scene.Background.B));
}
Intersection intersection = possibleIntersection.Value;
intersection.Tracer = this;
if (depth == 4)
{
}
Color result = intersection.Material.Ambient * Scene.Ambient;
foreach (var light in Scene.Lights)
{
Vector lightDir = light.GetDirAt(intersection.Point);
double lightPower = light.PowerAt(intersection.Point);
Color lightColor = light.shade(intersection);
Color current = new Color();
current += ShadingModels.LambertModel(intersection, lightDir) * intersection.Material.Lambert;
current += ShadingModels.PhongModel(intersection, lightDir) * intersection.Material.Phong;
current += ShadingModels.BlinnPhongModel(intersection, lightDir) * intersection.Material.BlinnPhong;
current *= (lightColor * lightPower);
result += current;
}
if (intersection.Material.Reflectance > 0)
{
result += intersection.Material.ReflectiveColor * intersection.Material.Reflectance *
trace(new Ray(
intersection.Point,
Vector.Reflect(
intersection.Ray.Direction,
intersection.Normal)
), depth - 1);
}
if (intersection.Material.Refractivity > 0)
{
Vector?direction = Vector.Refract(
intersection.Ray.Direction,
intersection.Normal,
intersection.Material.RefractivePower
);
if (direction.HasValue)
{
result += intersection.Material.RefractiveColor * intersection.Material.Refractivity *
trace(new Ray(intersection.Point, direction.Value), depth - 1);
}
}
return(result);
}