Project_PrincipleOverview_G_YunNan_2025/ModeDisplay/Assets/Scripts/OperatingPrinciple/wave/FixedStartWave.shader

Shader "Custom/FixedStartWave"
{
    Properties
    {
        _Amplitude("Amplitude", Float) = 0.5
        _WaveLength("Wave Length", Float) = 1.0   // 控制波长（单位宽度）
       //_Frequency("Frequency", Float) = 6  // 波数，控制波长
       _Speed("Wave Speed", Float) = 1
        //_TimeValue("Time", Float) = 0
        _AnchorX("Anchor X", Float) = 0
        _MainTex("Texture", 2D) = "white" {}
    }
        SubShader
    {
        Tags { "RenderType" = "Opaque" }
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

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

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            float _Amplitude;
            float _WaveLength;
            float _Speed;
            float _AnchorX;
            sampler2D _MainTex;

            v2f vert(appdata v)
            {
                v2f o;

                float x = v.vertex.x;
                //float relativeX = x - _AnchorX;

                // 波动值
                //float wavePhase = _Frequency * relativeX - _Speed * _TimeValue;

                float relativeX = v.vertex.x - _AnchorX;
                float wavePhase = (2 * UNITY_PI * relativeX / _WaveLength) - _Speed * _Time.y;
                //float wavePhase = _Frequency * relativeX - _Speed * _Time.y;
                float yOffset = _Amplitude * sin(wavePhase);

                // 起点偏移，确保锚点y=0固定
                //float anchorOffset = _Amplitude * sin(-_Speed * _TimeValue);
                float anchorOffset = _Amplitude * sin((2 * UNITY_PI * 0 / _WaveLength) - _Speed * _Time.y);
                //float anchorOffset = _Amplitude * sin(-_Speed * _Time.y);
                v.vertex.y += yOffset - anchorOffset;

                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;

                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                return tex2D(_MainTex, i.uv);
            }


            ENDCG
        }
    }
}