Unity Shader学习记录之根据屏幕坐标和深度图重建世界坐标_unity 重建世界坐标

看了好久的体积光教程，始终卡在重建世界坐标这一步，今天照着官方代码误打误撞弄出来了。

单纯记录一下实现代码及结果，具体实现逻辑还有点懵。

Shader "shaderName"
{
    Properties{}
    SubShader
    {
        Tags { "RenderType"="Opaque" "RenderPipeline" = "UniversalPipeline"}
        Cull Off ZWrite Off ZTest Always
 
        Pass
        {
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
 
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl"  
 
            struct appdata
            {
                float4 vertex : POSITION;
            };
 
            struct v2f
            {
                float4 vertex : SV_POSITION;
            };
 
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = TransformObjectToHClip(v.vertex);
                return o;
            }
 
            half4 frag (v2f i) : SV_Target
            {
                float2 UV = i.vertex.xy / _ScaledScreenParams.xy;
                #if UNITY_REVERSED_Z
                real depth = SampleSceneDepth(UV);
                #else
                real depth = lerp(UNITY_NEAR_CLIP_VALUE, 1, SampleSceneDepth(UV));
                #endif
                float3 worldPos = ComputeWorldSpacePosition(UV, depth, UNITY_MATRIX_I_VP);
 
                return half4(worldPos,1);
            }
            
            ENDHLSL
        }
    }
}