unity电流特效shader完整代码

电流特效在Unity中通常使用Shader来创建，特别是通过自定义顶点和片段着色器。以下是一个简单的电流线条特效的Shader代码示例，我们使用Unlit/Transparent shader类型：

Shader "Custom/CurrentEffect" {
    Properties {
        _Color("Color", Color) = (1, 1, 1, 1)
        _LineWidth("Line Width", Range(0, 5)) = 1
        _Speed("Speed", Float) = 1.0
    }

    SubShader {
        Tags {"RenderType"="Transparent"}
        LOD 200

        Pass {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            struct appdata {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
                float4 pos : TEXCOORD1; // Position for effect
            };

            sampler2D _MainTex;

            v2f vert (appdata v) {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.pos = v.vertex * float4(_LineWidth, 0, 0, 1); // Line width effect
                return o;
            }

            fixed4 frag (v2f i) : SV_Target {
                float t = _Time.y * _Speed; // Time-based speed
                float2 dir = sin(float(t * 10.0) + i.uv.xy) * 0.2; // Random direction
                float4 color = tex2D(_MainTex, i.uv) * _Color;
                return color + float4(dir.x, dir.y, 0, 0); // Add current effect to color
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}

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