unity urp 10 RenderTexture

stonstad · 发表于 2022-6-15 13:01

一、思路

render texture的过程很简单，就是在创建一个render texture，然后设置某个相机，将该相机观察到的图像输出到这个texture中。之后就可以将这个render texture作为纹理来使用了。过程如下所示。

二、代码

这里使用render texture实现一种镜子的效果，即创建一个相机从镜子的方向观察，然后将图像输出到render texture中，之后再shader中将render texure的uv坐标水平反转即可（1-uv.x）。
Shader &#34;Unlit/12_Mirror&#34;
{
Properties
{
      _MainTex (&#34;Texture&#34;, 2D) = &#34;white&#34; {}
}
SubShader
{
      Tags { &#34;RenderType&#34;=&#34;Opaque&#34; }

      HLSLINCLUDE
      #include&#34;Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl&#34;
      #include&#34;Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl&#34;
      struct Attributes
      {
         float3 positionOS: POSITION;
         half3 normalOS: NORMAL;
         half4 tangentOS: TANGENT;
         float2 texcoord: TEXCOORD0;
      };

      struct Varyings
      {
         float2 uv: TEXCOORD0;
         float3 positionWS: TEXCOORD1;
         half3 normalWS: TEXCOORD2;
         half3 tangentWS: TEXCOORD3;
         half3 bitangentWS: TEXCOORD4;
         float4 positionCS: SV_POSITION;
      };

      CBUFFER_START(UnityPerMaterial)
      float4 _MainTex_ST;
      CBUFFER_END
      sampler2D _MainTex;

      ENDHLSL

      Pass
      {
         Tags
         {
            &#34;LightMode&#34;=&#34;UniversalForward&#34;
         }
         HLSLPROGRAM
         #pragma vertex vert
         #pragma fragment frag

         Varyings vert (Attributes input)
         {
            Varyings output;
            VertexPositionInputs vertexInput = GetVertexPositionInputs(input.positionOS);
            VertexNormalInputs vertexNormalInputs = GetVertexNormalInputs(input.normalOS, input.tangentOS);
            output.positionCS = vertexInput.positionCS;
            output.positionWS = vertexInput.positionWS;
            output.normalWS = vertexNormalInputs.normalWS;
            output.tangentWS = vertexNormalInputs.tangentWS;
            output.bitangentWS = vertexNormalInputs.bitangentWS;
            output.uv = TRANSFORM_TEX(input.texcoord, _MainTex);
            //水平翻转
            output.uv.x = 1-output.uv.x;
            return output;
         }

         half4 frag (Varyings input) : SV_Target
         {
            Light mainLight = GetMainLight();
            float3 lightDirWS = mainLight.direction;
            float3 normalWS = normalize(input.normalWS);
            float3 viewDirWS = SafeNormalize(GetCameraPositionWS()-input.positionWS);
            float3 reflectWS = reflect(-viewDirWS,normalWS);

            half4 col = tex2D(_MainTex, input.uv);

            return col;
         }
         ENDHLSL
      }
}
}
三、结果

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[笔记] unity urp 10 RenderTexture

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