平面立體的投影ppt課件(已修改)
2024-12-20 04:17 本頁面
【正文】 Summary of Polyhedral Solids 平面立體概述 Prism 棱柱 Pyramid 棱錐 Exercise 練習題 Projection of Polyhedral Solids 平面立體的投影 請點擊相應標題顯示其內(nèi)容 2 Summary of Polyhedral Solids 平面立體概述 Prisms 棱柱 Intersection lines of edge planes are called edge lines. Intersection lines of edge planes and bases are called base edge lines. When drawing projections of polyhedral solids, we are actually drawing the projections of all edge lines and base edge lines followed by a visibility test of the projected edge lines and base edge lines. 各棱面的交線稱為棱線 ,棱面與底面的交線稱為底邊 ,畫平面立 體的投影圖 ,實質(zhì)是畫出所有棱線和底邊的投影 ,并判別其可見性 。 Pyramids 棱錐 Polyhedral solids 平面立體 請點擊鼠標左鍵顯示后面內(nèi)容 Polyhedral solids: The solids that are surrounded by planes are called polyhedral solids. 平面立體 : 完全由平面圍成的立體稱為平面立體。 3 Class by the bases of prisms 根據(jù)棱柱底面形狀可分為 : Triangular prism 三棱柱 Prism 棱柱 Square prism 四棱柱 Pentagonal prism 五棱柱 Hexagonal prism 六棱柱 Draw steps 畫圖步驟 ： Draw centerlines and datum lines. 先畫中心線和基準線 。 Add lines for the upper and lower (end) faces.
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