镜面卷积（也称为预过滤环境贴图）。
此 Cubemap 纹理的每个像素已替换为入射照明（朝向使用 Phong 瓣加权的相应方向）的积分。每个 Mipmap 都使用不同的 Phong 指数进行卷积，高分辨率 Mipmap 表示光泽反射，而低分辨率 Mip 非常模糊，适用于非常粗糙的镜面反射。
可用于在光泽对象和粗糙对象上反射光线（通过使用反射矢量进行采样）。
另请参阅：TextureImporterSettings.cubemapConvolution。
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