public Brush PerceivedColor(LightSource light, _Point CamPosition)
{
_Point LightVector = VectMath.Subtract(this.Position, light.Position);
_Point PercVector = this.Position;
_Point Rvector = VectMath.RotateByAngle(VectMath.Negate(LightVector), Normal, 180);
double whitefactor = Math.Abs(.5 * Math.Sin(VectMath.AngleBetween(Normal, LightVector)) + .5);
double colorfactor = Math.Abs(Math.Cos(VectMath.AngleBetween(Normal, LightVector)));
double Total = Math.Pow(Math.Sin(VectMath.AngleBetween(PercVector, Rvector)), 2);
SolidBrush brush = new SolidBrush(Color.FromArgb(Convert.ToInt32(255 * Total * colorfactor * whitefactor), Convert.ToInt32(255 * Total * whitefactor), Convert.ToInt32(255 * Total * whitefactor)));
return(brush);
}
public static _Point RotateByAngle(_Point pnt, _Point Axis, double Angle)
{
if (VectMath.IsParallel(pnt, Axis) == true)
{
return(pnt);
}
Angle = (Angle * Math.PI) / 180;
_Point Avector = VectMath.Subtract(pnt, VectMath.Project(pnt, Axis));
double MagAvector = VectMath.Magnitude(Avector);
_Point V1 = VectMath.Unit(VectMath.Cross(Axis, Avector));
_Point V2 = (VectMath.Negate(Avector));
_Point TransVector = VectMath.Add(VectMath.Scale(V1, MagAvector * Math.Sin(Angle)), VectMath.Scale(V2, (-1 * Math.Cos(Angle) + 1)));
return(VectMath.Add(TransVector, pnt));
}