unity shader实现玻璃折射效果

本文实例为大家分享了unity shader实现玻璃折射的具体代码，供大家参考，具体内容如下

shader "unlit/render_reflect"
{
 properties
 {
 _maintex ("texture", 2d) = "white" {}
 }
 subshader
 {
 tags {"queue" = "transparent" "rendertype"="opaque" }
 lod 100
 grabpass{"_screentex"}
 pass
 {
  cgprogram
  #pragma vertex vert
  #pragma fragment frag
  // make fog work
  #pragma multi_compile_fog
  
  #include "unitycg.cginc"
#include "lighting.cginc"
#include "autolight.cginc"
  struct appdata
  {
  float4 vertex : position;
  float2 uv : texcoord0;
  };

  struct v2f
  {
  float4 uv : texcoord0;
  float2 uv2 : texcoord1;
  float4 vertex : sv_position;
  };

  sampler2d _maintex;
  float4 _maintex_st;
  sampler2d _screentex;
  v2f vert (appdata v)
  {
  v2f o;
  o.vertex = unityobjecttoclippos(v.vertex);
  o.uv2 = transform_tex(v.uv, _maintex);
  o.uv = computegrabscreenpos(o.vertex);
  //o.uv.x = 1 - o.uv.x;
  return o;
  }
  
  fixed4 frag (v2f i) : sv_target
  {
  // sample the texture
  i.uv.xy += float2(0.1,0.1);
  fixed4 fra = tex2d(_screentex, i.uv.xy/i.uv.w);
  fixed4 fle = tex2d(_maintex, i.uv2);
  // apply fog
  return lerp(fra, fle, 0.2);
  }
  endcg
 }
 }
}

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