目的

将列表中的Item上面挂载的特效在滑动出列表范围的时候裁剪特效的溢出

效果图

制作步骤

1. 将列表包装成一个组件.2. 并且添加一个图形组件

2. 设置图形的遮罩和溢出处理

3. 设置图形的属性 这里不能设置为空白（我找这个问题找了2个小时）

4. 设置粒子特效的Shader

1. 将下面的代码放在Shader的Property 的位置

_StencilComp ("Stencil Comparison", Float) = 8
_Stencil ("Stencil ID", Float) = 0
_StencilOp ("Stencil Operation", Float) = 0
_StencilWriteMask ("Stencil Write Mask", Float) = 255
_StencilReadMask ("Stencil Read Mask", Float) = 255

2. 将下面的代码放在Shader的SubShader 的里面的位置和Tag 同一级

Stencil
{
    Ref [_Stencil]
    Comp [_StencilComp]
    Pass [_StencilOp] 
    ReadMask [_StencilReadMask]
    WriteMask [_StencilWriteMask]
}

完成代码(源文件为Mobile/Particles/Alpha Blended 路径)

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

// Simplified Alpha Blended Particle shader. Differences from regular Alpha Blended Particle one:
// - no Tint color
// - no Smooth particle support
// - no AlphaTest
// - no ColorMask

Shader "FairyGUI/Mobile/Particles/Alpha Blended"
{
    Properties
    {
        _MainTex ("Particle Texture", 2D) = "white" {}
        // FairyGUI Stencil Start
        _StencilComp ("Stencil Comparison", Float) = 8
        _Stencil ("Stencil ID", Float) = 0
        _StencilOp ("Stencil Operation", Float) = 0
        _StencilWriteMask ("Stencil Write Mask", Float) = 255
        _StencilReadMask ("Stencil Read Mask", Float) = 255
        // FairyGUI Stencil End
    }

    Category
    {
        Tags
        {
            "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane"
        }
        // FairyGUI Stencil Start
        Stencil
        {
            Ref [_Stencil]
            Comp [_StencilComp]
            Pass [_StencilOp]
            ReadMask [_StencilReadMask]
            WriteMask [_StencilWriteMask]
        }
        // FairyGUI Stencil End
        Blend SrcAlpha OneMinusSrcAlpha
        Cull Off Lighting Off ZWrite Off Fog
        {
            Color (0,0,0,0)
        }

        BindChannels
        {
            Bind "Color", color
            Bind "Vertex", vertex
            Bind "TexCoord", texcoord
        }

        SubShader
        {
            Pass
            {
                SetTexture [_MainTex] {
                combine texture * primary
                }
            }
        }
    }
}

5. 将特效预制体或特效组件挂到列表中的Item对象上即可

参考文档

官方文档：https://fairygui.com/docs/unity/insert3d