Update

Assets/Invector-3rdPersonController/Shooter/Editor/Resources/AlphaMask.shader

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+Shader "Separate Alpha Mask" {
+    Properties {
+        _MainTex ("Base (RGB)", 2D) = "white" {}
+        _Alpha ("Alpha (A)", 2D) = "white" {}
+    }
+    SubShader {
+        Tags { "RenderType" = "Transparent" "Queue" = "Transparent"}
+       
+        ZWrite Off
+       
+        Blend SrcAlpha OneMinusSrcAlpha
+        ColorMask RGB
+       
+        Pass {
+            SetTexture[_MainTex] {
+                Combine texture
+            }
+            SetTexture[_Alpha] {
+                Combine previous, texture
+            }
+        }
+    }
+}