写一个Unity光波扩散Shader

在Unity中编写一个光波扩散Shader，你可以创建一个自定义着色器脚本，通常基于顶点着色器（Vertex Shader）和片段着色器（Fragment Shader）。下面是一个简单的例子，展示如何实现一个基础的光波扩散效果：

Shader "Custom/LightWaveDiffuse"
{
    Properties
    {
        _Color("颜色", Color) = (1,1,1,1)
        _Intensity("强度", Range(0, 1)) = 1
        _Speed("速度", Float) = 0.5
        _Scale("缩放", Vector2) = (1, 1)
    }

    SubShader
    {
        Tags {"Queue"="Transparent" "RenderType"="Opaque"}
        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;
            };

            sampler2D _MainTex;
            fixed4 _Color;
            float _Intensity;
            float _Speed;
            vec2 _Scale;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                // 光波扩散算法
                float time = _Time.y * _Speed;
                float waveAmplitude = sin(_Time.y * _Speed * _Scale.x);
                float waveFrequency = _Scale.y;

                fixed4 col = tex2D(_MainTex, i.uv) * _Color;
                col.rgb += waveAmplitude * sin(dot(col.rgb, normalize(i.uv)) + time * waveFrequency);
                return col;
            }
            ENDCG
        }
    }
    FallBack "Diffuse"
}

// 使用这个Shader
{
    rendermode additive;
    material { shader Custom/LightWaveDiffuse; color [_Color]; }
}