实体定义
立方体（GfcBlockShape）。
属性定义
序号属性名称中文解释数据类型必填
GfcRoot
GfcShape
1LocalCoordinate局部坐标系GfcCoordinates3d√
2BoundingBox外接包围盒GfcBox3d
GfcParametricShape
GfcSolidShape
GfcPrimitiveShape
GfcBlockShape
3XLength长GfcDouble√
4YLength宽GfcDouble√
5ZLength高GfcDouble√
继承关系
GfcRoot
  └GfcShape
    └GfcParametricShape
      └GfcSolidShape
        └GfcPrimitiveShape
          └GfcBlockShape