add test pen

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Assets/pen/UnlitWithColor.shader

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+Shader "Custom/UnlitWithColor"
+{
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+
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+
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+
+            sampler2D _MainTex;
+            float4 _MainTex_ST;
+            fixed4 _Color;
+
+            v2f vert (appdata v)
+            {
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+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
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+                return col * _Color;
+            }
+            ENDCG
+        }
+    }
+}

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