SDF experiments

Assets/Shaders/SDF4test.shader

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+Shader "ConformalDecals/SDF4test"
+{
+    Properties
+    {
+        _MainTex("_MainTex (RGB spec(A))", 2D) = "white" {}
+        _Color1("Color 1", Color) = (0,0,0,0)
+        _Color2("Color 2", Color) = (0,0,0,0)
+        _Color3("Color 3", Color) = (0,0,0,0)
+        _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
+        _Smoothness ("SDF smoothness", Range(0,1)) = 0.15
+
+    }
+    SubShader
+    {
+        Tags { "Queue" = "Transparent" }
+        Cull Back
+        ZWrite On
+        
+        Pass
+        {
+             Blend SrcAlpha OneMinusSrcAlpha
+
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            sampler2D _MainTex;
+            float4 _Color1;
+            float4 _Color2;
+            float4 _Color3;
+            float _Smoothness;
+            float _Cutoff;
+
+            
+            #include "UnityCG.cginc"
+            #include "Lighting.cginc"
+            #include "AutoLight.cginc"
+
+            struct v2f {
+                float4 pos : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float3 worldPosition : TEXCOORD1;
+                half3 worldNormal : TEXCOORD2;
+            };
+
+            v2f vert(float4 vertex : POSITION, float2 uv : TEXCOORD0) {
+                v2f o;
+                o.pos = UnityObjectToClipPos(vertex);
+                o.uv = uv;
+                o.worldPosition = mul(unity_ObjectToWorld, vertex).xyz;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target {
+                fixed4 c = 0;
+                float4 s = tex2D(_MainTex,(i.uv));
+
+                s.rgb = s.rbg;
+
+                c = lerp(c, _Color1, smoothstep(_Cutoff, saturate(_Smoothness+ _Cutoff), s.r + s.g + s.b));
+                c = lerp(c, _Color2, smoothstep(_Cutoff, saturate(_Smoothness+ _Cutoff), s.g + s.b ));
+                c = lerp(c, _Color3, smoothstep(_Cutoff, saturate(_Smoothness+ _Cutoff), s.b ));
+
+                // if (s.r + s.g + s.b > 0.5) {
+                //     if (s.r > s.g && s.r > s.b) c = _Color1;
+                //     if (s.g > s.r && s.g > s.b) c = _Color2;
+                //     if (s.b > s.g && s.b > s.r) c = _Color3;
+                // }
+
+                return c;
+            }
+
+            ENDCG
+        } 
+    }
+}