Created interior imposter reflection shader

Assets/measuregeneric/shaders/InteriorReflectionShader.shader

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+Shader "Custom/InteriorReflectionShader"
+{
+    Properties
+    {
+        _ReflectionIntensity ("Reflection Intensity", Range(0, 1)) = 1.0
+    }
+    
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 300
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+
+            float _ReflectionIntensity;
+
+            // Use built-in cubemap sampler (unity_SpecCube0) for reflection probe
+            // UNITY_DECLARE_TEXCUBE(unity_SpecCube0);
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float3 normal : NORMAL;
+            };
+
+            struct v2f
+            {
+                float4 pos : SV_POSITION;
+                float3 worldPos : TEXCOORD0;
+                float3 worldNormal : TEXCOORD1;
+            };
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.pos = UnityObjectToClipPos(v.vertex);
+                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+                o.worldNormal = normalize(mul((float3x3)unity_ObjectToWorld, v.normal));
+                return o;
+            }
+
+            half3 ComputeBoxProjectedReflection(float3 worldPos, float3 worldNormal)
+            {
+                // Calculate direction from the object to the reflection probe position
+                float3 probeToPixel = worldPos - unity_SpecCube0_ProbePosition;
+
+                // Calculate inverse box scale manually
+                float3 boxSize = unity_SpecCube0_BoxMax - unity_SpecCube0_BoxMin;
+                float3 invBoxSize = 1.0 / boxSize;
+
+                // Transform the position into the box projection space
+                float3 localPos = probeToPixel * invBoxSize + 0.5;
+
+                // Calculate reflection direction
+                float3 reflectionDir = normalize(worldPos - _WorldSpaceCameraPos);
+
+                // Sample the cubemap using the adjusted reflection direction
+                return UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, reflectionDir).rgb;
+            }
+
+            half4 frag (v2f i) : SV_Target
+            {
+                // Calculate reflection using box projection
+                half3 reflectionColor = ComputeBoxProjectedReflection(i.worldPos, i.worldNormal);
+                return half4(reflectionColor, 1.0);
+            }
+            ENDCG
+        }
+    }
+    
+    FallBack "Diffuse"
+}

Assets/measuregeneric/shaders/InteriorReflectionShader.shader.meta

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+fileFormatVersion: 2
+guid: 6e36733ecafa0ce46b70364ace1c77f0
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: