正投影法原理ppt課件(已修改)
2025-04-03 06:04 本頁面
【正文】 Form of Projection 投影的形成 Types of Projection 投影法分類 Features of Orthographic Projection 正投影特性 Threeview of Component 物體的三視圖 Exercises 練習(xí)題 Principles of Orthographic Projection 正 投 影 法 原 理 請(qǐng)點(diǎn)擊相應(yīng)標(biāo)題顯示其內(nèi)容 2 Center of projection Plane of projection Object Lines of projection Projection Form of Projection 投影的形成 Projection method : When the line of projection passes through the object and the pre established plane, there will be graphics produced on the plane. This method is called projection. 投影法 ： 投影法是投射線通過物體，向選定的平面投射， 并在該面上得到圖形的方法。 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 3 Types of Projection 投影法分類 Projection method 投影法 Central projection method 中心投影法 ( The central projection is mainly used for the pictorial drawings of buildings. 一般多用于建筑圖樣 ) Parallel projection method 平行投影法 ( It is used in most engineering drawings. 廣泛用于機(jī)械、電子、化工等行業(yè)的圖樣 ) 請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容 4 3. Homophyly: When planar features or lines are inclined to the 類似性 projection plane in general, the projection produces similar shapes of the original feature. The length of projected lines will be shorter than the real length. 當(dāng)圖形或直線傾斜于投影面時(shí)，圖形的投影成類似形 ,線 段的投影長(zhǎng)度比實(shí)長(zhǎng)短 。 2. Accumulation: When planar features or lines are orthogonal to the 積聚性 projection plane, the projection accumulates to a
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