【正文】
體 , 如消隨算法只適合于凸實體而不適于凹實體 , 則模型是不完整的 。 ?簡明性: 不包含冗余信息 。 ?有效性: 能夠產(chǎn)生有效的實體。 Attributes Wireframe model Surface model Surface model Simplicity Very simple Complex Highly plex Ambiguity Very ambiguous Less Very less User training Easy Requires more training Difficult Applicability of shading algorithms Not available Available Available Calculation of mass characteristics No No Yes Suitability for NC tool path generation Medium High High Capability to handle spatial addressability Incapable Incapable Capable Relative parisons of the basic types of model representations 構(gòu)造實體幾何法 CSG (Consturctive Solid Geometry) 基本思想 復(fù)雜的實體可以用形狀相對簡單的體素,通過形體幾何集合運算而生成。 二大要件 ?基本材料:體素 ?處理方法:形體幾何集合運算 體素 ?形狀簡單的規(guī)則物體,如長方體、圓