RectMask2D

矩形2D遮罩

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.

RectMask2D 是一種類似Mask控件的遮罩。mask把子元素限制在父元素的矩形區域中。和標準的Mask不同，它有一些限制，但是它也有很多性能上的好處。

Description

描述

A common use of a RectMask2D is to show small sections of a larger area. Using the RectMask2D to frame this area.

RectMask2D一個常見的用法是展示一張大圖的一個小區域。使用RectMask2D去構建這個區域。

The limitations of RectMask2D control are:

RectMask2D空間的限制是：

• It only works in 2D space
• It will not properly mask elements that are not coplanar
• 它工作在2D空間
• 它不能正常地遮罩不在一個面上的元素

The advantages of RectMask2D are:

RectMask2D 的優點

• It does not use the stencil buffer
• No extra draw calls
• No material changes
• Fast performance
• 它沒有使用模板緩沖
• 沒有額外的Draw Calls
• 沒有改變材質
• 更快的性能

Unity2017.1官方UGUI文檔翻譯——RectMask2D