90 lines
3.2 KiB
Plaintext
90 lines
3.2 KiB
Plaintext
Shader "Custom/SimpleGrid"
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{
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Properties
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{
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_MainColor ("Sub Grid Color", Color) = (0.5, 0.5, 0.5, 0.2)
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_AxisColor ("Major Grid Color", Color) = (0.8, 0.8, 0.8, 0.5)
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_GridSpacing ("Grid Spacing", Float) = 1.0
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_LineWidth ("Line Width", Range(0.001, 0.1)) = 0.02
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_FadeDist ("Fade Distance", Float) = 100.0
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}
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SubShader
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{
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Tags { "RenderType"="Transparent" "Queue"="Transparent-1" } // -1 保证在普通物体后面
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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Cull Off
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Pass
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{
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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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struct Attributes { float4 vertex : POSITION; };
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struct Varyings { float4 position : SV_POSITION; float3 worldPos : TEXCOORD0; };
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CBUFFER_START(UnityPerMaterial)
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float4 _MainColor;
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float4 _AxisColor;
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float _GridSpacing;
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float _LineWidth;
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float _FadeDist;
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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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// 优化的网格计算
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float gridAlpha(float2 worldPos, float spacing, float width)
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{
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float2 coord = worldPos / spacing;
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// fwidth 用于保持线条在屏幕上的像素宽度一致
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float2 grid = abs(frac(coord - 0.5) - 0.5) / fwidth(coord);
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float lineVal = min(grid.x, grid.y);
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// 1.0 - smoothstep 提供抗锯齿
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return 1.0 - smoothstep(width, width + 1.0, lineVal);
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}
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half4 frag(Varyings IN) : SV_Target
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{
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// 距离裁剪：太远直接 discard，节省后续计算
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float dist = distance(IN.worldPos, _WorldSpaceCameraPos);
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if (dist > _FadeDist) discard;
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float alphaFade = 1.0 - (dist / _FadeDist);
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// 二次衰减让边缘更柔和
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alphaFade *= alphaFade;
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float2 pos = IN.worldPos.xz;
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// 计算两层网格
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float baseGrid = gridAlpha(pos, _GridSpacing, _LineWidth);
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float largeGrid = gridAlpha(pos, _GridSpacing * 10.0, _LineWidth); // 10倍格
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// 混合
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float4 finalColor = _MainColor;
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finalColor.a *= baseGrid;
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// 叠加高亮网格
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// 使用 max 避免 alpha 混合错误
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finalColor = lerp(finalColor, _AxisColor, largeGrid);
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finalColor.a = max(finalColor.a, _AxisColor.a * largeGrid);
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finalColor.a *= alphaFade;
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// 极低 Alpha 剔除
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if (finalColor.a < 0.01) discard;
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return finalColor;
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}
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ENDHLSL
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}
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}
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} |