/// <summary>
/// Calculate false color.
/// </summary>
private Color FalseColor(double z)
{
// Simple example of one way to change a number
// into a color.
var s = m_z_range.NormalizedParameterAt(z);
s = RhinoMath.Clamp(s, 0.0, 1.0);
var hue = m_hue_range.ParameterAt(s);
return(ColorFromHsv(hue, 1.0, 1.0));
}