114 lines
4.1 KiB
Plaintext
114 lines
4.1 KiB
Plaintext
Shader "Custom/Grid"
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{
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Properties
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{
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_LineColor("Line Color", Color) = (1,1,1,1)
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_BackgroundColor("Background Color", Color) = (0,0,0,0)
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_GridScale("Grid Scale", Float) = 1
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_LineWidth("Line Width", Float) = 0.05
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_Fade("Fade", Float) = 0.1
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_Plane("Plane (0: XZ, 1: XY, 2: YZ)", Float) = 0
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_DisappearStartDistance("Disappear Start Distance", Float) = 50
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_DisappearEndDistance("Disappear End Distance", Float) = 100
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}
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SubShader
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{
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Tags { "RenderType"="Transparent" "Queue"="Transparent" }
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LOD 100
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Pass
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{
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Name "GridPass"
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Cull Off
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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HLSLPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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// 内置变量：摄像机在世界空间中的位置
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//float3 _WorldSpaceCameraPos;
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struct Attributes
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct Varyings
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{
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float4 position : SV_POSITION;
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float3 worldPos : TEXCOORD0;
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};
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CBUFFER_START(UnityPerMaterial)
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float4 _LineColor;
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float4 _BackgroundColor;
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float _GridScale;
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float _LineWidth;
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float _Fade;
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float _Plane;
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float _DisappearStartDistance;
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float _DisappearEndDistance;
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CBUFFER_END
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Varyings vert(Attributes IN)
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{
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Varyings OUT;
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OUT.position = TransformObjectToHClip(IN.vertex);
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OUT.worldPos = TransformObjectToWorld(IN.vertex).xyz;
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return OUT;
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}
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// 根据 _Plane 选择二维坐标
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float2 GetGridCoordinates(float3 pos)
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{
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if (_Plane < 0.5) // XZ 平面
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return pos.xz;
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else if (_Plane < 1.5) // XY 平面
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return pos.xy;
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else // YZ 平面
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return pos.yz;
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}
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// 根据 _Plane 获取摄像机在网格平面上的位置
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float2 GetCameraPlanePosition()
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{
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if (_Plane < 0.5) // XZ 平面：摄像机投影到 XZ
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return _WorldSpaceCameraPos.xz;
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else if (_Plane < 1.5) // XY 平面：摄像机投影到 XY
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return _WorldSpaceCameraPos.xy;
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else // YZ 平面：摄像机投影到 YZ
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return _WorldSpaceCameraPos.yz;
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}
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half4 frag(Varyings IN) : SV_Target
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{
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// 计算二维网格坐标并乘以 _GridScale
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float2 gridCoord = GetGridCoordinates(IN.worldPos) * _GridScale;
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// 用 frac 与 fwidth 实现平滑网格线（抗锯齿）
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float2 grid = abs(frac(gridCoord - 0.5) - 0.5) / fwidth(gridCoord);
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float lineIntensity = 1.0 - smoothstep(0.0, _LineWidth, min(grid.x, grid.y));
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// 计算摄像机在平面上的位置与当前片元的二维距离
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float2 camPos2D = GetCameraPlanePosition();
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float2 fragPos2D = GetGridCoordinates(IN.worldPos);
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float dist = distance(fragPos2D, camPos2D);
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// 超过 100 米开始淡出，到 200 米完全透明
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float distanceFade = saturate((_DisappearEndDistance - dist) / _DisappearStartDistance);
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// 最终 alpha 是网格线强度乘以距离淡出因子
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float finalAlpha = lineIntensity * distanceFade;
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// 背景颜色始终透明，所以直接输出网格线颜色与 alpha
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return float4(_LineColor.rgb, finalAlpha);
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}
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ENDHLSL
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}
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}
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FallBack "Diffuse"
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}
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