93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
Shader "IndianOcean/EchoRing"
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{
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// 回声红圈 Shader —— 配合 EchoSystem 使用
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// 在地面（XZ平面）上绘制一个红色渐变圆环，圆环位置跟随全局 _EchoRadius
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// 边缘使用 smoothstep 渐变，从圆环中心满透明度向两侧柔和消散
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Properties
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{
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_RingColor ("Ring Color", Color) = (1, 0.15, 0.1, 1)
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_RingWidth ("Ring Width (world units)", Float) = 2.5
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}
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SubShader
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{
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Tags
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{
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"RenderType" = "Transparent"
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"Queue" = "Transparent+250"
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"RenderPipeline" = "UniversalPipeline"
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}
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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ZTest Always
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Cull Off
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Pass
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{
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Name "EchoRing"
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HLSLPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile_instancing
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionOS : POSITION;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float3 worldPos : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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CBUFFER_START(UnityPerMaterial)
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float4 _RingColor;
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float _RingWidth;
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CBUFFER_END
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// 全局回声参数（由 EchoSystem 通过 Shader.SetGlobalX 设置）
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float4 _EchoCenter; // xy = 回声中心世界坐标 XZ
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float _EchoRingRadius; // 红圈独立扩散半径
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float _EchoRingAlpha; // 红圈独立透明度（独立于描边强度）
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Varyings vert(Attributes input)
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{
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Varyings output;
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_TRANSFER_INSTANCE_ID(input, output);
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output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
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output.worldPos = TransformObjectToWorld(input.positionOS.xyz);
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return output;
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}
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half4 frag(Varyings input) : SV_Target
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{
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// 世界空间 XZ 平面上的距离
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float2 wp = input.worldPos.xz;
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float dist = distance(wp, _EchoCenter.xy);
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// 距离圆环中心的偏差
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float distFromRing = abs(dist - _EchoRingRadius);
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// 渐变：圆环中心满强度，两侧柔和消散
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float halfW = max(0.001, _RingWidth * 0.5);
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float alpha = 1.0 - smoothstep(0.0, halfW, distFromRing);
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// 乘以红圈独立透明度（独立于描边消散时序）
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alpha *= _EchoRingAlpha;
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if (alpha < 0.001) discard;
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return half4(_RingColor.rgb, alpha * _RingColor.a);
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}
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ENDHLSL
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}
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}
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FallBack Off
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}
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