public void RemoveQuadsAtIndex(int index, int amount)
{
Debug.Assert(index + amount <= Quads.Count, "removeQuadAtIndex: Invalid index");
Quads.RemoveAt(index, amount);
Dirty = true;
}
// Removes a quad at a given index number.
// The capacity remains the same, but the total number of quads to be drawn is reduced in 1
public void RemoveQuadAtIndex(int index)
{
Debug.Assert(index < Quads.Count, "removeQuadAtIndex: Invalid index");
Quads.RemoveAt(index);
Dirty = true;
}