// TODO: Check this function
/// <summary>
/// Recursively remove all polygons in `polygons` that are inside this BSP tree.
/// </summary>
public List <Polygon> ClipPolygons(Polygon[] polygons)
{
if (this.plane == null)
{
return(polygons.Clone <Polygon>().ToList());
} // TODO: Removed slice here?
List <Polygon> front = new List <Polygon>();
List <Polygon> back = new List <Polygon>();
for (int i = 0; i < polygons.Length; i++)
{
this.plane.SplitPolygon(polygons[i], ref front, ref back, ref front, ref back);
}
if (this.front != null)
{
front = this.front.ClipPolygons(front.ToArray());
}
if (this.back != null)
{
back = this.back.ClipPolygons(back.ToArray());
}
else
{
back = new List <Polygon>();
}
return(front.Concat(back).ToList());
}
