三面投影圖的形成和基本規(guī)律 Formation and F

主講：陳冬Lecturer:ChenDong三面投影圖的形成和基本規(guī)律

FormationandFundamentalPrinciplesofThree-ViewDrawing知識回顧Knowledgereview投影的分類

Classificationofprojections中心投影Centralprojection斜投影ObliqueProjection直角投影OrthographicProjection平行投影ParallelProjection知識回顧Knowledgereview一個投影不加任何注釋，不能確定物體的形狀和結(jié)構(gòu)Aprojectionwithoutanyannotationscannotdeterminetheshapeandstructureoftheobject如何通過投影圖，確定物體的形狀和結(jié)構(gòu)呢？Howtodeterminetheshapeandstructureofanobjectthroughaprojectiondiagram?三面投影Three-ViewDrawing三面投影Three-ViewDrawing三面投影體系

Three-ViewProjectionSystem由三個互相垂直相交

的投影面構(gòu)成三面投影體系Thethree-viewprojectionsystemconsistsofthreemutuallyperpendicularintersectionprojectionplanes三面投影：用正投影法將物體分別向三個相互垂直相交的投影面投影后，即可得到物體的三面投影Three-viewprojection:Usetheorthographicprojectionmethodtoprojectanobjectontothreeprojectionplanesperpendicularintersectiontoeachother,athree-viewprojectionoftheobjectcanbeobtained三面投影Three-ViewDrawing平行投影ParallelProjection直角投影OrthographicProjection三面投影Three-ViewDrawing三面投影Three-ViewDrawing三面投影的相關概念Therelatedconceptsofthree-viewprojection正立投影面

V

→

主視圖FrontprojectionplaneV→frontview水平投影面H→

俯視圖HorizontalprojectionplaneH→topview側(cè)立投影面W→

左視圖SideprojectionplaneW→leftview三面投影Three-ViewDrawing三面投影的展開Unfoldingofthree-viewprojection保持V面不動，H面繞OX軸旋轉(zhuǎn)90度KeeptheVplanestationary,androtatetheHplanearoundtheOXaxisby90°再將W面繞OZ軸旋轉(zhuǎn)90度RotatetheWplanearoundtheOZaxisby90°此時V、H、W三個視圖共面，稱為三視圖Atthistime,thethreeviewsV,HandWarecoplanar,whichiscalledthethree-viewdrawing三視圖的三個重要關系Threeimportantrelationshipsofthree-viewdrawing三視圖的三個重要關系Threeimportantrelationshipsofthree-viewdrawing位置關系PositionalRelationship俯視圖位于主視圖的正下方Thetopviewislocateddirectlybelowthefrontview左視圖位于主視圖的正右方Theleftviewislocatedrightabovethefrontview三視圖的三個重要關系Threeimportantrelationshipsofthree-viewdrawing投影關系ProjectionRelationship長對正，高平齊，寬相等Lengthaligned,heightlevel,widthequal三視圖的三個重要關系Threeimportantrelationshipsofthree-viewdrawing三視圖的三個重要關系Threeimportantrelationshipsofthree-viewdrawing例

題

Example課堂小結(jié)CourseSummary課堂小結(jié)CourseSummary1.三視圖的形成及其相關概念1.Formationofthree-viewdrawingandrelatedconcepts2.三面投影的展開2.Unfoldingofthree-viewprojection3.三視圖的三個重要關系3.Threeimportantrelationshipsofthree-viewdrawing課后練習After-classExercise課后練習After-classExercise