平面与平面立体相交课件.ppt

本小节结束***请点击相应标题显示其内容Intersectionofplanesandsurfacesofapolyhedralsolid

平面与平面立体相交Exercises练习题Characteristicsofintersectionline截交线的特性Themethodoffindingintersectionlines求截交线的方法Procedureofdrawingintersectionlines求截交线的步骤1.Characteristicsofintersectionline截交线的特性Intersectionofplanesandsurfacesofapolyhedralsolid平面与平面立体相交Segmentsofanintersectionlinearecommonsegmentstoboththeintersectingplaneandsurfacesofthesolid.截交线上任一点都是截平面与立体表面的共有点;Segmentsofanintersectionlinearecommonsegmentstoboththeintersectingplaneandsurfacesofthesolid.截交线是截平面和立体表面的共有线(交线)。Segmentsoftheintersectionlinealsoformaclosedplanearea.截交线是封闭的平面图形。请点击鼠标左键显示后面内容Intersectingplane截平面Intersectionline截交线Commonality共有性:Closedloop封闭性:2.Themethodoffindingintersectionlines求截交线的方法Drawingofcommonlinesoftheintersectingplaneandboundaryplanesofthepolyhedralsolid.求各棱面与截平面的交线。请点击鼠标左键显示后面内容Intersectionofplanesandsurfacesofapolyhedralsolid平面与平面立体相交Drawingofcommonpointsoftheintersectingplaneandedgelinesofthepolyhedralsolid;求各棱线与截平面的交点；(1)Analysistheintersectionline.分析截交线；3.Procedureofdrawingintersectionlines求截交线的步骤请点击鼠标左键显示后面内容Example1.Drawthreeviewsofacuttingtriangularpyramid.求三棱锥被截切后的三视图。Example2.DrawH,Vviewsofacuttingpentagonalprism.求五棱柱被截切后的V、H面投影。Intersectionofplanesandsurfacesofapolyhedralsolid平面与平面立体相交(2)Drawspecialpoints.求截交线上特殊位置各点（顶点、拐点）的投影；(3)Distinguishvisibility.判别可见性后，按顺序连接各点的投影；(4)Completetheprojection.根据立体和截交线的二面投影求出第三面投影；(5)Eraseunnecessarylinesanddrawdeeply.擦去被截掉部分,加深图线。2.DrawV,Hviewsofacuttingtriangularpyramid.求正三棱锥被截切后的V、H投影。Exercises练习题请点击题目显示其内容1.DrawV,Hviewsofacuttingsquareprism.求正四棱柱被截切后