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Assets/Materials/Boss/bossFace_shader.shader

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+Shader "Unlit/bossFace_shader"
+{
+    Properties
+    {
+        _FaceTexture ("Face texture", 2D) = "white" {}
+		_Cols("Columns", Float)=4
+		_Index("Index", Float)=0
+		_Speed("Speed", Float)=1
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            // make fog work
+            #pragma multi_compile_fog
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                UNITY_FOG_COORDS(1)
+                float4 vertex : SV_POSITION;
+            };
+
+			sampler2D _FaceTexture;
+			float4 _FaceTexture_ST;
+
+			float _Cols;
+			float _Index;
+			float _Speed;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = v.uv;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+				_Index = _Index + _Time.y*_Speed;
+                // sample the texture
+				float2 flipBookUV = i.uv*float2(1 / _Cols, 1);
+				flipBookUV.x += ((floor(_Index)%_Cols)*(1/_Cols));
+                fixed4 col = tex2D(_FaceTexture, flipBookUV);
+                return col;
+            }
+            ENDCG
+        }
+    }
+}