double umin, umax, vmin, vmax; // nur zur Kommunikation mit OCas nötig
public OffsetSurface(ISurface baseSurface, double offset, BoundingRect?usedArea = null) : base(usedArea)
{
this.baseSurface = baseSurface;
this.offset = offset;
baseSurface.GetNaturalBounds(out umin, out umax, out vmin, out vmax);
}
