전장의 안개 로직 개선

미탐험지역은 검게 덮음. 탐험된 지역은 어두운 색, 보고 있는 블록은 밝은색

Assets/Materials/FogHeightMask.shader

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+// 파일명: FogHeightMask.shader
+Shader "Custom/FogHeightMask"
+{
+    Properties { _MainColor ("Fog Color", Color) = (0,0,0,1) }
+    SubShader {
+        Tags { "Queue"="Transparent" "RenderType"="Transparent" }
+        Blend SrcAlpha OneMinusSrcAlpha // 투명도 사용 설정
+        ZWrite Off
+
+        Pass {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+
+            struct v2f {
+                float4 vertex : SV_POSITION;
+                float3 worldPos : TEXCOORD0;
+            };
+
+            sampler2D _GlobalFogTex;
+            float _FogWorldSize;
+            float _GroundLevelY; // 매니저가 보내줄 높이값
+            float4 _MainColor;
+
+            v2f vert (appdata_base v) {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target {
+                // [핵심 로직] 현재 픽셀의 높이가 지상 레벨보다 높으면 투명하게!
+                if (i.worldPos.y > _GroundLevelY) return fixed4(0,0,0,0);
+
+                float2 uv = i.worldPos.xz / _FogWorldSize + 0.5;
+                fixed4 fogData = tex2D(_GlobalFogTex, uv);
+                
+                return fixed4(_MainColor.rgb, fogData.a); // 안개 텍스처의 알파값(검정 정도) 적용
+            }
+            ENDCG
+        }
+    }
+}

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