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1、效果

scene视图中的效果：

game视图中效果：

 2、核心思想：改变UI的顶点坐标

3、好处：可以用正交相机来实现3D效果。

4、Shader 实现

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)Shader "UI/UI3DEffects"{    Properties    {        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}        _Color("Tint", Color) = (1,1,1,1)        _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        _ColorMask("Color Mask", Float) = 15        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip("Use Alpha Clip", Float) = 0        _Change("Change",Range(0,1)) = 1.0    }    SubShader    {        Tags        {            "Queue"="Transparent"            "IgnoreProjector"="True"            "RenderType"="Transparent"            "PreviewType"="Plane"            "CanUseSpriteAtlas"="True"        }        Stencil        {            Ref [_Stencil]            Comp [_StencilComp]            Pass [_StencilOp]            ReadMask [_StencilReadMask]            WriteMask [_StencilWriteMask]        }        //Cull Off //是否剔除背面        Lighting Off        ZWrite Off        ZTest [unity_GUIZTestMode]        Blend SrcAlpha OneMinusSrcAlpha        ColorMask [_ColorMask]        Pass        {            Name "Default"        CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #pragma target 2.0            #include "UnityCG.cginc"            #include "UnityUI.cginc"            #pragma multi_compile __ UNITY_UI_CLIP_RECT            #pragma multi_compile __ UNITY_UI_ALPHACLIP            struct appdata_t            {                float4 vertex   : POSITION;                float4 color    : COLOR;                float2 texcoord : TEXCOORD0;                UNITY_VERTEX_INPUT_INSTANCE_ID            };            struct v2f            {                float4 vertex   : SV_POSITION;                fixed4 color    : COLOR;                float2 texcoord  : TEXCOORD0;                float4 worldPosition : TEXCOORD1;                UNITY_VERTEX_OUTPUT_STEREO            };            fixed4 _Color;            fixed4 _TextureSampleAdd;            float4 _ClipRect;            float _Change;            v2f vert(appdata_t v)            {                v2f OUT;                UNITY_SETUP_INSTANCE_ID(v);                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);                //修改顶点位置                if (v.vertex.x< 0)                {                    OUT.worldPosition = v.vertex;                }                else                 {                    OUT.worldPosition = v.vertex*_Change;                }                                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);                OUT.texcoord = v.texcoord;                OUT.color = v.color * _Color;                return OUT;            }            sampler2D _MainTex;            fixed4 frag(v2f IN) : SV_Target            {                half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;                #ifdef UNITY_UI_CLIP_RECT                color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);                #endif                #ifdef UNITY_UI_ALPHACLIP                clip (color.a - 0.001);                #endif                return color;            }        ENDCG        }    }}

5、使用：

通过修改Change的值修改效果