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"
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。