Project_PrincipleOverview_G_YunNan_2025/ModeDisplay/Assets/Scripts/OperatingPrinciple/CoilPolarWipe/DirectionalWipeTransparent.shader

Shader "Custom/DirectionalWipeTransparent"
{
    Properties
    {
        _MainTex("Texture", 2D) = "white" {}
        _Color("Color Tint", Color) = (1,1,1,1)
        _Threshold("Wipe Threshold", Range(-1, 1)) = -1
        _EdgeSmooth("Edge Smoothness", Range(0.001, 1)) = 0.1
        _WipeDir("Wipe Direction Vector", Vector) = (1, 0, 0, 0) // 默认沿X轴
    }

        SubShader
        {
            Tags { "Queue" = "Transparent" "RenderType" = "Transparent" }
            LOD 200
            Blend SrcAlpha OneMinusSrcAlpha
            ZWrite Off
            Cull Off

            Pass
            {
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag

                #include "UnityCG.cginc"

                sampler2D _MainTex;
                float4 _Color;
                float _Threshold;
                float _EdgeSmooth;
                float4 _WipeDir; // 方向向量，xyz有效

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

                struct v2f
                {
                    float2 uv : TEXCOORD0;
                    float4 vertex : SV_POSITION;
                    float3 localPos : TEXCOORD1;
                };

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

                fixed4 frag(v2f i) : SV_Target
                {
                    // 方向向量点乘位置向量，得到在该方向上的投影值
                    float wipeCoord = dot(i.localPos, _WipeDir.xyz);

                // 使用 smoothstep 实现边缘渐变
                float alphaMask = smoothstep(_Threshold - _EdgeSmooth, _Threshold + _EdgeSmooth, wipeCoord);

                fixed4 col = tex2D(_MainTex, i.uv) * _Color;
                col.a *= alphaMask;
                return col;
            }
            ENDCG
        }
        }
}