public unsafe Color Lighting(ILight light, IShape shape, ref Tuple point, ref Tuple eye, ref Tuple normal, double lightIntensity)
{
var color = Pattern.GetColorAtShape(shape, ref point);
double *x = stackalloc double[1];
double *y = stackalloc double[1];
double *z = stackalloc double[1];
x[0] = light.Position.X;
y[0] = light.Position.Y;
z[0] = light.Position.Z;
var lightColor = light.GetIntensityAt(x[0], y[0], z[0], ref point);
return(Lighting(1, x, y, z, ref point, ref eye, ref normal, lightIntensity, color, lightColor));
}