Example2.Point B below A10,after A5,left A10.construct projections of B. 已知点在A下10m,A后5m,A左10m处，求点的三投影. B Steps作图步骤： (1)Construct projection b,b. 根据B的相对位置求投影b',b。 (2)Constructprojection" 根据点的投影规律求b"。 请点击鼠标左健显示后面内容
6 x 0 YW Y H z a' a" a 下 10 左 10 后 5 b Steps 作图步骤： （2）Construct projection b". 根据点的投影规律求b" 。 Example2. Point B below A10, after A5,left A10.construct projections of B. 已知点B在A下10mm,A后5mm,A左10mm处,求B点的三投影。 请点击鼠标左键显示后面内容 A B （1）Construct projection b',b. 根据B的相对位置求投影b' ,b。 b' b
ldentification and labeling of coincident point 重影点的判别与标注 Defining when two points on the solid are on the same vertical line of a projection plane,the two projected 定义 points will be the same point and the two points are called the coincident point of the projection. 当两点在某一投影面上的投影重合时称为该面的重影点。 When projected to the V-Plane,front covering back. 投影在面上重合时，前遮后（坐标大的可见）。 ldentification When projected to the H-Plane,up covering down. 判别 投影在H面上重合时，上遮下（坐标大的可见）。 When projected to the W-Plane,left covering right. 投影在面上重合时，左遮右（坐标大的可见）。 Labeling All invisible projections of points are written in brackets. 标注 将点在某投影面上的不可见投影加括号标注以示区别。 请点击鼠标左键显示后面内容
7 Identification 判别 When projected to the H-Plane, up covering down. 投影在H面上重合时，上遮下(Z坐标大的可见)。 Identification and labeling of coincident point 重影点的判别与标注 请点击鼠标左键显示后面内容 Labeling 标注 Defining 定义 when two points on the solid are on the same vertical line of a projection plane, the two projected points will be the same point and the two points are called the coincident point of the projection. 当两点在某一投影面上的投影重合时称为该面的重影点。 When projected to the V-Plane, front covering back. 投影在V面上重合时，前遮后(Y坐标大的可见)。 When projected to the W-Plane, left covering right. 投影在W面上重合时，左遮右(X坐标大的可见)。 All invisible projections of points are written in brackets. 将点在某投影面上的不可见投影加括号标注以示区别