public RealColor Add(RealColor value)
{
R += value.R;
G += value.G;
B += value.B;
return(this);
}
public void Tint(RealColor value)
{
Multiply(value.A);
float other = 1 - value.A;
Add(new RealColor(value.R * other, value.G * other, value.B * other));
}
public RealColor Multiply(RealColor value)
{
A *= value.A;
R *= value.R;
G *= value.G;
B *= value.B;
return(this);
}
public static RealColor Average(IEnumerable <RealColor> values)
{
RealColor col = Black.Copy();
foreach (RealColor val in values)
{
col.Add(val);
}
col.Multiply(1f / (float)values.Count());
return(col);
}
public static RealColor Average(RealColor[] values)
{
RealColor col = Black.Copy();
for (int x = 0; x < values.Length; x++)
{
col.Add(values[x]);
}
col.Multiply(1f / (float)values.Length);
return(col);
}
/// <summary>
/// Lambertian shades a base color.
/// </summary>
/// <param name="baseColor"></param>
/// <param name="surfaceNormal"></param>
/// <param name="incomingColor"></param>
/// <param name="direction"></param>
/// <returns>base * ambient * Dot(normal, direction)</returns>
public static RealColor LambertianShade(RealColor baseColor, Vector3 surfaceNormal, RealColor incomingColor, Vector3 direction, RealColor ambient)
{
float u = Vector3.Dot(surfaceNormal, direction);
if (u < 0f)
{
return(baseColor.Copy());
}
RealColor diffuse = baseColor.Copy().Multiply(ambient).Multiply(u);
diffuse.Add(baseColor);
//diffuse.Clamp();
return(diffuse);
}
public RealColor LambertianShade(Vector3 surfaceNormal, RealColor incomingColor, Vector3 direction, RealColor ambient)
{
return(RealColor.LambertianShade(this, surfaceNormal, incomingColor, direction, ambient));
}