Render tactical bridges unlit (#6963)

src/main/csharp/net/eagle0/clients/unity/eagle0/Assets/TileableBridgePack/Materials/BridgeUnlitCutout.shader

@@ -0,0 +1,52 @@
+Shader "Eagle0/Bridge Unlit Cutout" {
+    Properties {
+        _Color("Color", Color) = (1,1,1,1)
+        _MainTex("Albedo", 2D) = "white" {}
+        _Cutoff("Alpha Cutoff", Range(0,1)) = 0.5
+    }
+    SubShader {
+        Tags {
+            "Queue" = "AlphaTest"
+            "RenderType" = "TransparentCutout"
+        }
+        LOD 100
+        Cull Off
+
+        Pass {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f {
+                float4 vertex : SV_POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            sampler2D _MainTex;
+            float4 _MainTex_ST;
+            fixed4 _Color;
+            fixed _Cutoff;
+
+            v2f vert(appdata v) {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+                return o;
+            }
+
+            fixed4 frag(v2f i) : SV_Target {
+                fixed4 col = tex2D(_MainTex, i.uv) * _Color;
+                clip(col.a - _Cutoff);
+                return col;
+            }
+            ENDCG
+        }
+    }
+}

src/main/csharp/net/eagle0/clients/unity/eagle0/Assets/TileableBridgePack/Materials/BridgeUnlitCutout.shader.meta

@@ -0,0 +1,9 @@
+fileFormatVersion: 2
+guid: 8f8a809e92654467bf6ca58b65b8cd9d
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData:
+  assetBundleName:
+  assetBundleVariant:

src/main/csharp/net/eagle0/clients/unity/eagle0/Assets/TileableBridgePack/Materials/bridges_d.mat

@@ -7,7 +7,7 @@ Material:
   m_CorrespondingSourceObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
   m_Name: bridges_d
-  m_Shader: {fileID: 7, guid: 0000000000000000f000000000000000, type: 0}
+  m_Shader: {fileID: 4800000, guid: 8f8a809e92654467bf6ca58b65b8cd9d, type: 3}
   m_ShaderKeywords: 
   m_LightmapFlags: 5
   m_EnableInstancingVariants: 0
@@ -22,6 +22,7 @@ Material:
         m_Texture: {fileID: 2800000, guid: bc2efd6efa03cf648891b122fee20d49, type: 3}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
-    m_Floats: []
+    m_Floats:
+    - _Cutoff: 0.5
     m_Colors:
     - _Color: {r: 1, g: 1, b: 1, a: 1}