111111111111

Signed-off-by: TRAfoer <lhf190@outlook.com>

Assets/Shaders/Grid.shader

@@ -1,57 +1,36 @@
-Shader "Custom/Grid"
+Shader "Custom/SimpleGrid"
 {
     Properties
     {
-        _LineColor("Line Color", Color) = (1,1,1,1)
-        _BackgroundColor("Background Color", Color) = (0,0,0,0)
-        _GridScale("Grid Scale", Float) = 1
-        _LineWidth("Line Width", Float) = 0.05
-        _Fade("Fade", Float) = 0.1
-        _Plane("Plane (0: XZ, 1: XY, 2: YZ)", Float) = 0
-        _DisappearStartDistance("Disappear Start Distance", Float) = 50
-        _DisappearEndDistance("Disappear End Distance", Float) = 100
+        _MainColor ("Sub Grid Color", Color) = (0.5, 0.5, 0.5, 0.2)
+        _AxisColor ("Major Grid Color", Color) = (0.8, 0.8, 0.8, 0.5)
+        _GridSpacing ("Grid Spacing", Float) = 1.0
+        _LineWidth ("Line Width", Range(0.001, 0.1)) = 0.02
+        _FadeDist ("Fade Distance", Float) = 100.0
     }
     SubShader
     {
-        Tags { "RenderType"="Transparent" "Queue"="Transparent" }
-        LOD 100
+        Tags { "RenderType"="Transparent" "Queue"="Transparent-1" } // -1 保证在普通物体后面
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+        Cull Off
 
         Pass
         {
-            Name "GridPass"
-            Cull Off
-            Blend SrcAlpha OneMinusSrcAlpha
-            ZWrite Off
-
             HLSLPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
 
-            // 内置变量：摄像机在世界空间中的位置
-            //float3 _WorldSpaceCameraPos;
-
-            struct Attributes
-            {
-                float4 vertex : POSITION;
-                float2 uv : TEXCOORD0;
-            };
-
-            struct Varyings
-            {
-                float4 position : SV_POSITION;
-                float3 worldPos : TEXCOORD0;
-            };
+            struct Attributes { float4 vertex : POSITION; };
+            struct Varyings { float4 position : SV_POSITION; float3 worldPos : TEXCOORD0; };
 
             CBUFFER_START(UnityPerMaterial)
-            float4 _LineColor;
-            float4 _BackgroundColor;
-            float _GridScale;
-            float _LineWidth;
-            float _Fade;
-            float _Plane;
-            float _DisappearStartDistance;
-            float _DisappearEndDistance;
+                float4 _MainColor;
+                float4 _AxisColor;
+                float _GridSpacing;
+                float _LineWidth;
+                float _FadeDist;
             CBUFFER_END
 
             Varyings vert(Attributes IN)
@@ -62,52 +41,50 @@ Shader "Custom/Grid"
                 return OUT;
             }
 
-            // 根据 _Plane 选择二维坐标
-            float2 GetGridCoordinates(float3 pos)
+            // 优化的网格计算
+            float gridAlpha(float2 worldPos, float spacing, float width)
             {
-                if (_Plane < 0.5)      // XZ 平面
-                    return pos.xz;
-                else if (_Plane < 1.5) // XY 平面
-                    return pos.xy;
-                else                   // YZ 平面
-                    return pos.yz;
-            }
-
-            // 根据 _Plane 获取摄像机在网格平面上的位置
-            float2 GetCameraPlanePosition()
-            {
-                if (_Plane < 0.5)      // XZ 平面：摄像机投影到 XZ
-                    return _WorldSpaceCameraPos.xz;
-                else if (_Plane < 1.5) // XY 平面：摄像机投影到 XY
-                    return _WorldSpaceCameraPos.xy;
-                else                   // YZ 平面：摄像机投影到 YZ
-                    return _WorldSpaceCameraPos.yz;
+                float2 coord = worldPos / spacing;
+                // fwidth 用于保持线条在屏幕上的像素宽度一致
+                float2 grid = abs(frac(coord - 0.5) - 0.5) / fwidth(coord);
+                float lineVal = min(grid.x, grid.y);
+                // 1.0 - smoothstep 提供抗锯齿
+                return 1.0 - smoothstep(width, width + 1.0, lineVal);
             }
 
             half4 frag(Varyings IN) : SV_Target
             {
-                // 计算二维网格坐标并乘以 _GridScale
-                float2 gridCoord = GetGridCoordinates(IN.worldPos) * _GridScale;
-                // 用 frac 与 fwidth 实现平滑网格线（抗锯齿）
-                float2 grid = abs(frac(gridCoord - 0.5) - 0.5) / fwidth(gridCoord);
-                float lineIntensity = 1.0 - smoothstep(0.0, _LineWidth, min(grid.x, grid.y));
+                // 距离裁剪：太远直接 discard，节省后续计算
+                float dist = distance(IN.worldPos, _WorldSpaceCameraPos);
+                if (dist > _FadeDist) discard;
                 
-                // 计算摄像机在平面上的位置与当前片元的二维距离
-                float2 camPos2D = GetCameraPlanePosition();
-                float2 fragPos2D = GetGridCoordinates(IN.worldPos);
-                float dist = distance(fragPos2D, camPos2D);
+                float alphaFade = 1.0 - (dist / _FadeDist);
+                // 二次衰减让边缘更柔和
+                alphaFade *= alphaFade; 
+
+                float2 pos = IN.worldPos.xz;
+
+                // 计算两层网格
+                float baseGrid = gridAlpha(pos, _GridSpacing, _LineWidth);
+                float largeGrid = gridAlpha(pos, _GridSpacing * 10.0, _LineWidth); // 10倍格
+
+                // 混合
+                float4 finalColor = _MainColor;
+                finalColor.a *= baseGrid;
+
+                // 叠加高亮网格
+                // 使用 max 避免 alpha 混合错误
+                finalColor = lerp(finalColor, _AxisColor, largeGrid);
+                finalColor.a = max(finalColor.a, _AxisColor.a * largeGrid);
                 
-                // 超过 100 米开始淡出，到 200 米完全透明
-                float distanceFade = saturate((_DisappearEndDistance - dist) / _DisappearStartDistance);
+                finalColor.a *= alphaFade;
                 
-                // 最终 alpha 是网格线强度乘以距离淡出因子
-                float finalAlpha = lineIntensity * distanceFade;
-                
-                // 背景颜色始终透明，所以直接输出网格线颜色与 alpha
-                return float4(_LineColor.rgb, finalAlpha);
+                // 极低 Alpha 剔除
+                if (finalColor.a < 0.01) discard;
+
+                return finalColor;
             }
             ENDHLSL
         }
     }
-    FallBack "Diffuse"
-}
+}