public Color Shade(HitRecord record, Vector3 wi)
{
Color pixelColor = new Color(0, 0, 0);
Vector3 normal = record.SurfaceNormal;
normal.Normalize();
wi.Normalize();
float noiseCoefficient = 0f;
switch (Noise)
{
case Noise.Turbulence:
noiseCoefficient = Turbulence(record.IntersectionPoint);
break;
case Noise.Marble:
noiseCoefficient = Marble(record.IntersectionPoint);
break;
case Noise.Bumb:
noiseCoefficient = 1f;
normal = Bump(record.IntersectionPoint, normal);
break;
case Noise.None:
noiseCoefficient = 1f;
break;
default:
noiseCoefficient = 1f;
break;
}
if (BumpTexture != null)
{
Color displacementColor = BumpTexture.GetColorFromTexCoordinate(record.HitObject.GetTextudeCoordinates(record));
Vector3 displacementNormal = normal;
displacementNormal.X = ((displacementColor.R * 2) - 1);
displacementNormal.Y = ((displacementColor.G * 2) - 1);
displacementNormal.Z = displacementColor.B;
normal = (Vector3.Dot(displacementNormal, normal) < 0) ? -displacementNormal : displacementNormal;
}
float nDotL = Vector3.Dot(normal, wi);
if (nDotL > 0)
{
Color diffuse;
if (Constants.TextureMapping && ColorTexture != null && !(record.HitObject is Plane))
{
diffuse = ColorTexture.GetColorFromTexCoordinate(record.HitObject.GetTextudeCoordinates(record));
}
else
{
diffuse = Diffuse;
}
//add Diffuse Light
pixelColor.Append(diffuse.Mult(nDotL).Mult(noiseCoefficient));
pixelColor.Append(pixelColor.Mult(1f - noiseCoefficient));
//Calculate the Blinn halfVector
Vector3 h = wi;
h = Vector3.Add(h, wi);
h.Normalize();
float hDotN = Vector3.Dot(h, normal);
if (hDotN > 0)
{
float pow = (float)Math.Pow(hDotN, Shininess);
pixelColor.Append(Specular.Mult(pow));
}
}
pixelColor.Append(Ambient);
pixelColor.Clamp(0f, 1f);
return(pixelColor);
}
