// WireShader.shader
Shader "Custom/WireShader"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _Thickness ("Thickness", Range(0, 0.1)) = 0.02
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" "Queue"="Geometry+1" }
        LOD 100
        
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fog
            
            #include "UnityCG.cginc"
            
            struct appdata
            {
                float4 vertex : POSITION;
            };
            
            struct v2f
            {
                float4 vertex : SV_POSITION;
                UNITY_FOG_COORDS(0)
            };
            
            fixed4 _Color;
            float _Thickness;
            
            v2f vert (appdata v)
            {
                v2f o;
                
                // 将顶点稍微向摄像机方向偏移，避免深度冲突
                float3 viewPos = UnityObjectToViewPos(v.vertex);
                viewPos.z -= _Thickness * 10; // 轻微深度偏移
                
                o.vertex = UnityViewToClipPos(viewPos);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 col = _Color;
                UNITY_APPLY_FOG(i.fogCoord, col);
                return col;
            }
            ENDCG
        }
    }
}