一个透明的shader

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杨航最近在学Unity3D

Shader "Custom/xiankuang" {
Properties {

    _LineColor ("Line Color", Color) = (1,1,1,1)
    _GridColor ("Grid Color", Color) = (1,1,1,0)
    _LineWidth ("Line Width", float) = 0.2
}
SubShader {
   Pass
    {
    //Tags { "RenderType" = "Transparent" }
   // Blend SrcAlpha OneMinusSrcAlpha//这句可以注释掉，能够避免线框太粗出现的模糊效果。
    //AlphaTest Greater 0.5
    //Cull Off//这句是后加的，取消遮挡消隐，体现出透明

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag

    uniform float4 _LineColor;
    uniform float4 _GridColor;
    uniform float _LineWidth;

    // vertex input: position, uv1, uv2
    struct appdata
    {
    float4 vertex : POSITION;
    float4 texcoord1 : TEXCOORD0;
    float4 color : COLOR;
    };

    struct v2f
    {
    float4 pos : POSITION;
    float4 texcoord1 : TEXCOORD0;
    float4 color : COLOR;
    };

    v2f vert (appdata v)
    {
    v2f o;
    o.pos = mul( UNITY_MATRIX_MVP, v.vertex);
    o.texcoord1 = v.texcoord1;
    o.color = v.color;
    return o;
    }

    fixed4 frag(v2f i) : COLOR
    {
    fixed4 answer;

    float lx = step(_LineWidth, i.texcoord1.x);
    float ly = step(_LineWidth, i.texcoord1.y);
    float hx = step(i.texcoord1.x, 1.0 - _LineWidth);
    float hy = step(i.texcoord1.y, 1.0 - _LineWidth);

    answer = lerp(_LineColor, _GridColor, lx*ly*hx*hy);

    return answer;
    }
    ENDCG
    }
    }
    Fallback "Vertex Colored", 1
}

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