| brushPosition | Position of the BrushCell. | 
| x | X Position of the BrushCell. | 
| y | Y Position of the BrushCell. | 
| z | Z Position of the BrushCell. | 
| sizex | X Size of Brush. | 
| sizey | Y Size of Brush. | 
| sizez | Z Size of Brush. | 
int Index to the BrushCell.
Gets the index to the GridBrush.BrushCell based on the position of the BrushCell.