Some shit i dunno

Assets/measuregeneric/shaders/InteriorReflectionShader2.shader

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+// Original code from https://gist.github.com/josephbk117/a43f5335cea9b3e12a44f196dc81f30f
+Shader "Custom/InteriorReflectionShader"
+{
+    Properties
+    {
+        _Glossiness ("Smoothness", Range(0,1)) = 0.8
+        _ReflectionProbePosition ("Reflection Probe Position", Vector) = (0,0,0,0)
+        _ReflectionProbeBoxMin ("Box Min", Vector) = (0,0,0,0)
+        _ReflectionProbeBoxMax ("Box Max", Vector) = (0,0,0,0)
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 200
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+            #include "UnityStandardUtils.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float3 normal : NORMAL;
+            };
+
+            struct v2f
+            {
+                float4 pos : SV_POSITION;
+                float3 worldNormal : TEXCOORD0;
+                float3 worldPos : TEXCOORD1;
+            };
+
+            float4 _ReflectionProbePosition;
+            float4 _ReflectionProbeBoxMin;
+            float4 _ReflectionProbeBoxMax;
+            half _Glossiness;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.pos = UnityObjectToClipPos(v.vertex);
+                o.worldNormal = UnityObjectToWorldNormal(v.normal);
+                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+                return o;
+            }
+
+            float3 BoxProjectReflectionDir(float3 worldPos, float3 worldRefl)
+            {
+                // Calculate relative position within the box
+                float3 boxMin = _ReflectionProbeBoxMin.xyz;
+                float3 boxMax = _ReflectionProbeBoxMax.xyz;
+                float3 boxCenter = 0.5 * (boxMin + boxMax);
+                float3 boxSize = boxMax - boxMin;
+
+                float3 localPos = worldPos - boxCenter;
+                float3 absLocalRefl = abs(worldRefl);
+
+                // Scale the reflection vector based on which side of the box it hits
+                float3 scale = boxSize / absLocalRefl;
+                float scaleMin = min(min(scale.x, scale.y), scale.z);
+                return localPos + worldRefl * scaleMin;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                // Get reflection vector
+                float3 worldViewDir = normalize(_WorldSpaceCameraPos - i.worldPos);
+                float3 worldRefl = reflect(worldViewDir, i.worldNormal);
+
+                // Apply box projection to the reflection vector
+                float3 projectedReflDir = BoxProjectReflectionDir(i.worldPos, worldRefl);
+                fixed4 reflectionColor = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, projectedReflDir);
+
+                return reflectionColor;
+            }
+            ENDCG
+        }
+    }
+    FallBack "Diffuse"
+}