| # RectMask2D | |
| A **RectMask2D** is a masking control similar to the **Mask** control. The mask restricts the child elements to the rectangle of the parent element. Unlike the standard Mask control it has some limitations, but it also has a number of performance benefits. | |
| ## Description | |
| A common use of a RectMask2D is to show small sections of a larger area. Using the RectMask2D to frame this area. | |
| The limitations of RectMask2D control are: | |
| - It only works in 2D space | |
| - It will not properly mask elements that are not coplanar | |
| The advantages of RectMask2D are: | |
| - It does not use the stencil buffer | |
| - No extra draw calls | |
| - No material changes | |
| - Fast performance | |