struct v2f
                {
                    float4 pos : SV_POSITION;
                    float3 worldPos : TEXCOORD3;
                };

                v2f vert(appdata_full v)
                {
                    v2f o;
                    float3 uvWorldPos = float3(v.texcoord1.xy * 2.0 - 1.0, 0.5);
                    o.pos = mul(UNITY_MATRIX_VP, float4(uvWorldPos, 1.0));
                    o.worldPos = v.vertex.xyz;
                    return o;
                }

                float4 frag(v2f i) : SV_Target
                {
                    float3 worldPos = i.worldPos;
                    return float4(worldPos, 1.0);
                }