编辑代码

Properties
{
    [HDR]_color("Color", Color) = {1,1,1,1}
    _baseMap("BaseMap", 2D) = "white"{}
}

Tags{"Queue"="Transparent""RenderType"="Transparent" "RenderPipeline"="UniversalPipeline"}

Varyings vert(Attributes v)
{
    o.positionOS = v.positionOS;
    o.positionWS = TransformObjectToWorld(v.positionOS.xyz);
    o.positionVS = TransformWorldToView(o.positionWS);
    o.positionCS = TransformViewToHClip(o.positionVS);

    o.uv = v.uv;
    return o;
}


half4 frag(Varyings i) : SV_Target
{
    // 采样深度图
    half2 screenUV = i.positionCS.xy / _screenParams.xy;
    half4 DepthMap = SAMPLE_TEXTURE2D(_cameraDepthTexture,sampler_cameraDepthTexture, screenUV);
    half4 DepthZ = LinearEyeDepth(DepthMap, _ZBufferParams);

    // 构建深度图上的像素在 观察空间下 的坐标
    float4 depthVS = 1;
    depthVS.xy = i.positionVS.xy * DepthZ / -i.positionVS.z;
    depthVS.z = DepthZ;

    //
    float3 depthWS = mul(unity_CameraToWorld, depthVS);
    float3 depthOS = mul(unity_WorldToObject, float4(depthWS, 1));

    //
    float2 uv = depthOS.xy + 0.5

    half4 baseMap = SAMPLE_TEXTURE2D(_baseMap, sampler_baseMap, uv) * _color;
}