private Color GetNaturalColor(SceneObject thing, Vector pos, Vector norm, Vector rd, Scene scene)
{
Color ret = Color.Make(0, 0, 0);
foreach (Light light in scene.Lights) {
Vector ldis = Vector.Minus(light.Pos, pos);
Vector livec = Vector.Norm(ldis);
double neatIsect = TestRay(new Ray() { Start = pos, Dir = livec }, scene);
bool isInShadow = !((neatIsect > Vector.Mag(ldis)) || (neatIsect == 0));
if (!isInShadow) {
double illum = Vector.Dot(livec, norm);
Color lcolor = illum > 0 ? Color.Times(illum, light.Color) : Color.Make(0, 0, 0);
double specular = Vector.Dot(livec, Vector.Norm(rd));
Color scolor = specular > 0 ? Color.Times(Math.Pow(specular, thing.Surface.Roughness), light.Color) : Color.Make(0, 0, 0);
ret = Color.Plus(ret, Color.Plus(Color.Times(thing.Surface.Diffuse(pos), lcolor),
Color.Times(thing.Surface.Specular(pos), scolor)));
}
}
return ret;
}
private Color GetReflectionColor(SceneObject thing, Vector pos, Vector norm, Vector rd, Scene scene, int depth)
{
return Color.Times(thing.Surface.Reflect(pos), TraceRay(new Ray() { Start = pos, Dir = rd }, scene, depth + 1));
}
private Color GetNaturalColor(SceneObject thing, Vector pos, Vector norm, Vector rd, Scene scene)
{
Color ret = new Color(Color.DefaultColor.R, Color.DefaultColor.G, Color.DefaultColor.B);
Vector rdNormalized = Vector.Norm(rd);
for (int i = 0; i < scene.Lights.Length; i++)
{
Light light = scene.Lights[i];
float vx = light.Pos.X - pos.X;
float vy = light.Pos.Y - pos.Y;
float vz = light.Pos.Z - pos.Z;
float sqrLength, invLength;
sqrLength = vx * vx + vy * vy + vz * vz;
invLength = SceneObject.InvSqrt(sqrLength);
Vector livec = new Vector(vx * invLength, vy * invLength, vz * invLength);
float neatIsect = TestRay(new Ray() { Start = pos, Dir = livec }, scene);
bool isInShadow = !((neatIsect == 0) || (neatIsect > vx * vx + vy * vy + vz * vz));
if (!isInShadow)
{
float illum = livec.X * norm.X + livec.Y * norm.Y + livec.Z * norm.Z;
float specular = livec.X * rdNormalized.X + livec.Y * rdNormalized.Y + livec.Z * rdNormalized.Z;
Color lcolor = illum > 0 ? Color.Times(illum, light.Color) : Color.Background;
Color scolor = specular > 0 ? Color.Times((float)Math.Pow(specular, thing.Surface.Roughness), light.Color) : Color.Background;
var diffuseSurfaceColor = thing.Surface.Diffuse(pos);
var specularSurfaceColor = thing.Surface.Specular(pos);
ret.R += diffuseSurfaceColor.R * lcolor.R + specularSurfaceColor.R * scolor.R;
ret.G += diffuseSurfaceColor.G * lcolor.G + specularSurfaceColor.G * scolor.G;
ret.B += diffuseSurfaceColor.B * lcolor.B + specularSurfaceColor.B * scolor.B;
}
}
return ret;
}