124 lines
3.9 KiB
Plaintext
124 lines
3.9 KiB
Plaintext
Shader "Custom/Outline"
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{
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Properties
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{
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_MainTex ("Main Texture", 2D) = "white" {}
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_OutlineColor ("Outline Color", Color) = (1,0.5,0,1)
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_OutlineWidth ("Outline Width", Range(0, 0.5)) = 0.1
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_GlowIntensity ("Glow Intensity", Range(0, 10)) = 3
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_Falloff ("Falloff", Range(0.1, 5)) = 2
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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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Cull Off
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata
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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 v2f
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{
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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float2 scaledWidth : TEXCOORD1;
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float2 uvSign : TEXCOORD2;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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float4 _OutlineColor;
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float _OutlineWidth;
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float _GlowIntensity;
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float _Falloff;
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v2f vert (appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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// 计算缩放符号
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float2 scaleSign = float2(
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sign(unity_ObjectToWorld._m00),
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sign(unity_ObjectToWorld._m11)
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);
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// 修正UV方向
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o.uv = v.uv * scaleSign + (1 - scaleSign)/2;
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o.uv = TRANSFORM_TEX(o.uv, _MainTex);
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// 计算有效描边宽度（基于世界空间缩放）
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float2 worldScale = float2(
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length(unity_ObjectToWorld._m00_m10_m20),
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length(unity_ObjectToWorld._m01_m11_m21)
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);
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o.scaledWidth = _OutlineWidth / abs(worldScale) * 0.5;
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o.uvSign = scaleSign;
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return o;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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// 基础颜色采样（处理镜像）
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float2 baseUV = i.uv;
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if(i.uvSign.x < 0) baseUV.x = 1 - baseUV.x;
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if(i.uvSign.y < 0) baseUV.y = 1 - baseUV.y;
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fixed4 col = tex2D(_MainTex, baseUV);
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if(col.a > 0.99) return col;
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// 渐变参数初始化
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float maxDistance = length(i.scaledWidth);
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float glow = 0;
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// 多级采样实现渐变
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const int steps = 8;
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for(int s=1; s<=steps; s++)
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{
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float progress = s/(float)steps;
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float currentWidth = progress * maxDistance;
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// 环形采样
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for(float angle=0; angle<6.283; angle+=1.047) // 60度步进
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{
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float2 dir = float2(cos(angle), sin(angle));
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float2 sampleUV = baseUV + dir * currentWidth;
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fixed4 sampleCol = tex2D(_MainTex, sampleUV);
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if(sampleCol.a > 0.95)
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{
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// 距离衰减计算
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float attenuation = 1 - pow(progress, _Falloff);
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glow += attenuation * _GlowIntensity / steps;
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break;
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}
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}
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}
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// 颜色混合（非线性插值）
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float glowFactor = saturate(glow);
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fixed4 final = col;
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final.rgb = lerp(col.rgb, _OutlineColor.rgb, glowFactor);
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final.a = max(col.a, glowFactor * _OutlineColor.a);
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return final;
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}
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ENDCG
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}
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}
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} |