public void flip()
{
vertices.Reverse();
for (int i = 0; i < vertices.Count; i++)
{
vertices[i].flip();
}
plane.flip();
}
// Convert solid space to empty space and empty space to solid space.
public void invert()
{
for (int i = 0; i < polygons.Count; i++)
{
polygons[i].flip();
}
plane.flip();
if (front != null)
{
front.invert();
}
if (back != null)
{
back.invert();
}
CSGNode temp = front;
front = back;
back = temp;
}