Unity shader实现遮罩效果

本文实例为大家分享了Unity shader实现遮罩效果的具体代码，供大家参考，具体内容如下

效果：

shader代码：

Shader "Custom/Mask" {
Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}//目标图片，即需要被遮罩的图片
_MaskLayer("Culling Mask",2D) = "white"{}//混合的图片，设置为白色的图片，任何颜色与白色混合，其颜色不变
_Cutoff("Alpha cutoff",Range(0,1)) = 0
}
SubShader {
Tags {
"Queue"="Transparent"
}//渲染队列设置为 以从后往前的顺序渲染透明物体
Lighting off //关闭光照
ZWrite off //关闭深度缓存
Blend off //关闭混合
AlphaTest GEqual[_Cutoff] //启用alpha测试

Pass{
SetTexture[_MaskLayer]{combine texture}//混合贴图
//混合贴图，previous为放置在前一序列这样在进行AlphaTest的时候会以这个图片为主来进行混合
SetTexture[_MainTex]{combine texture,previous}
}
}
}

新建一个材质球，然后将目标图片和遮挡图片赋予一下，即可看到效果

小编再为大家分享另一段代码：Unity shader无锯齿遮罩效果，忘记作者名字了，感谢这位朋友的分享。

这个Shader可以用于UGUI制作头像框遮罩，没有锯齿，非常nice

Shader "Custom/CircleMask" {
Properties {
 _MainTex ("MainTex", 2D) = "white" {}
 _MaskTex ("MaskTex", 2D) = "white" {}
 [HideInInspector]_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
 //MASK SUPPORT ADD
 _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
 //MASK SUPPORT END
}
SubShader {
 Tags {
  "IgnoreProjector"="True"
  "Queue"="Transparent"
  "RenderType"="Transparent"
 }
 //MASK SUPPORT ADD
 Stencil
 {
  Ref [_Stencil]
  Comp [_StencilComp]
  Pass [_StencilOp]
  ReadMask [_StencilReadMask]
  WriteMask [_StencilWriteMask]
 }
 ColorMask [_ColorMask]
 //MASK SUPPORT END
 Pass {
  Name "FORWARD"
  Tags {
   "LightMode"="ForwardBase"
  }
  Blend SrcAlpha OneMinusSrcAlpha
  ZWrite Off
  CGPROGRAM
  #pragma vertex vert
  #pragma fragment frag
  #define UNITY_PASS_FORWARDBASE
  #include "UnityCG.cginc"
  #pragma multi_compile_fwdbase
  #pragma only_renderers d3d9 d3d11 glcore gles
  #pragma target 3.0
  uniform sampler2D _MainTex; uniform float4 _MainTex_ST;
  uniform sampler2D _MaskTex; uniform float4 _MaskTex_ST;
  struct VertexInput {
   float4 vertex : POSITION;
   float2 texcoord0 : TEXCOORD0;
  };
  struct VertexOutput {
   float4 pos : SV_POSITION;
   float2 uv0 : TEXCOORD0;
  };
  VertexOutput vert (VertexInput v) {
   VertexOutput o = (VertexOutput)0;
   o.uv0 = v.texcoord0;
   o.pos = UnityObjectToClipPos( v.vertex );
   return o;
  }
  float4 frag(VertexOutput i) : COLOR {
////// Lighting:
   float4 _MainTex_var = tex2D(_MainTex,TRANSFORM_TEX(i.uv0, _MainTex));
   float3 finalColor = _MainTex_var.rgb;
   float4 _MaskTex_var = tex2D(_MaskTex,TRANSFORM_TEX(i.uv0, _MaskTex));
   return fixed4(finalColor,_MaskTex_var.a);
  }
  ENDCG
 }
}
FallBack "Diffuse"
}

来源：https://blog.csdn.net/yiwei151/article/details/78687163