Added North America floor map.

Assets/Shaders/SDF Map Borders.shader

@@ -10,6 +10,8 @@ Shader "Carmen/Maps/SDF Map Borders"
     {
         _MainTex ("SDF", 2D) = "white" {}
         _ColourTex ("Country Colours", 2D) = "white" {}
+
+        _LineThickness ("Line Thickness", float) = 0.15
     }
 
     SubShader
@@ -41,6 +43,10 @@ Shader "Carmen/Maps/SDF Map Borders"
         UNITY_DECLARE_TEX2D(_MainTex);
         UNITY_DECLARE_TEX2D(_ColourTex);
 
+        CBUFFER_START(UnityPerMaterial)
+            float _LineThickness;
+        CBUFFER_END
+
         struct SurfaceOutputVRC 
         {
             fixed3 Albedo;
@@ -60,7 +66,7 @@ Shader "Carmen/Maps/SDF Map Borders"
 
         void surf (Input IN, inout SurfaceOutputVRC o)
         {
-            half linestep = step(UNITY_SAMPLE_TEX2D(_MainTex, IN.uv_MainTex), 0.025);
+            half linestep = step(UNITY_SAMPLE_TEX2D(_MainTex, IN.uv_MainTex), _LineThickness);
             o.Albedo = lerp(UNITY_SAMPLE_TEX2D(_ColourTex, IN.uv_MainTex), half4(0.0, 0.0, 0.0, 1.0), linestep);
             o.Alpha = 1.0f;
         }