Second commit

Assets/Code/D/Cleaning/Shaders/BrushPainter.shader

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+Shader "Unlit/BrushPainter"
+{
+    Properties
+    {
+        _DrawPosition("Draw Position", Vector) = (0.5, 0.5, 0, 0)
+        _DrawRadius("Draw Radius", Float) = 0.05
+        _DrawAngleX("Draw Angle (Rad) X", Float) = 0.0
+        _DrawAngleY("Draw Angle (Rad) Y", Float) = 0.0
+        _ToolDirtiness("Tool Dirtiness", Range(0, 1)) = 0 
+        [MainTexture] _BrushTex("Brush Texture", 2D) = "white" {}
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            "RenderType" = "Transparent" 
+            "Queue" = "Transparent"
+        }
+
+        Pass
+        {
+            Blend SrcAlpha OneMinusSrcAlpha
+            ZWrite Off
+            ZTest Always
+            
+            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
+            {
+                float4 positionHCS : SV_POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            float4 _DrawPosition;
+            float _DrawRadius;
+            float _DrawAngleX;
+            float _DrawAngleY;
+            float _ToolDirtiness;
+
+            TEXTURE2D(_BrushTex);
+            SAMPLER(sampler_BrushTex);
+
+            Varyings vert(Attributes IN)
+            {
+                Varyings OUT;
+                OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
+                OUT.uv = IN.uv;
+                return OUT;
+            }
+
+            half4 frag(Varyings IN) : SV_Target
+            {
+                float2 centeredUV = (IN.uv - _DrawPosition.xy) / (_DrawRadius * 2.0);
+
+                float2 rotatedUV;
+                rotatedUV.x = centeredUV.x * _DrawAngleX - centeredUV.y * _DrawAngleY;
+                rotatedUV.y = centeredUV.x * _DrawAngleY + centeredUV.y * _DrawAngleX;
+                
+                float2 brushUV = rotatedUV + 0.5;
+
+                float inBounds = step(0.0, brushUV.x) * step(brushUV.x, 1.0) *
+                                 step(0.0, brushUV.y) * step(brushUV.y, 1.0);
+
+                half4 brushColor = SAMPLE_TEXTURE2D(_BrushTex, sampler_BrushTex, brushUV);
+
+                float brushMask = brushColor.a * inBounds;
+                float fillValue = _ToolDirtiness * brushMask;
+
+                return half4(fillValue, fillValue, fillValue, brushMask);
+            }
+            ENDHLSL
+        }
+    }
+}

Assets/Code/D/Cleaning/Shaders/BrushPainter.shader.meta

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+fileFormatVersion: 2
+guid: 31f42842d3a8460ea125575cb5a72a5a
+timeCreated: 1785925570