Stash work

Assets/Shaders/TrashMaze/ObjectVisibility.shader

@@ -0,0 +1,91 @@
+Shader "TrashMaze/ObjectVisibility"
+{
+    Properties
+    {
+        _MainTex ("Normal Texture (Color)", 2D) = "white" {}
+        _OutlineTex ("Outline Texture (White)", 2D) = "white" {}
+        [PerRendererData] _IsRevealed ("Is Revealed", Float) = 0
+        [PerRendererData] _IsInVision ("Is In Vision", Float) = 0
+    }
+    
+    SubShader
+    {
+        Tags 
+        { 
+            "Queue"="Transparent" 
+            "RenderType"="Transparent"
+            "IgnoreProjector"="True"
+        }
+        
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+        Cull Off
+        
+        Pass
+        {
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+            
+            struct Varyings
+            {
+                float2 uv : TEXCOORD0;
+                float4 positionCS : SV_POSITION;
+            };
+            
+            TEXTURE2D(_MainTex);
+            SAMPLER(sampler_MainTex);
+            TEXTURE2D(_OutlineTex);
+            SAMPLER(sampler_OutlineTex);
+            float4 _MainTex_ST;
+            
+            // Per-instance properties (set by RevealableObject component)
+            float _IsRevealed;
+            float _IsInVision;
+            
+            Varyings vert(Attributes input)
+            {
+                Varyings output;
+                VertexPositionInputs vertexInput = GetVertexPositionInputs(input.positionOS.xyz);
+                output.positionCS = vertexInput.positionCS;
+                output.uv = TRANSFORM_TEX(input.uv, _MainTex);
+                return output;
+            }
+            
+            half4 frag(Varyings input) : SV_Target
+            {
+                // Three-state logic:
+                // 1. In vision radius -> show normal texture (color)
+                // 2. Revealed but outside vision -> show outline texture (white)
+                // 3. Never revealed -> transparent (hidden)
+                
+                if (_IsInVision > 0.5)
+                {
+                    // Inside vision radius - show color
+                    return SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.uv);
+                }
+                else if (_IsRevealed > 0.5)
+                {
+                    // Revealed but outside vision - show outline
+                    return SAMPLE_TEXTURE2D(_OutlineTex, sampler_OutlineTex, input.uv);
+                }
+                else
+                {
+                    // Never revealed - transparent (hidden)
+                    return half4(0, 0, 0, 0);
+                }
+            }
+            ENDHLSL
+        }
+    }
+    
+    FallBack "Transparent/Diffuse"
+}
+