工程上一般都用多面视图(通称为三视图)来表示物体的形状,这种方法既简单又确切,但缺乏立体感。而轴测图的特点,正是富于立体感,直观性强,它的缺点是作图比较复杂,并且不能确切地表达物体每个面上的实形(即产生变形,如矩形变成平行四边形,圆变成椭 Engineering generally use multi-faceted view (commonly known as the three view) to represent the shape of the object, this method is simple and precise, but the lack of three-dimensional. The axonometric features, it is rich in three-dimensional, intuitive and strong, its disadvantage is more complex mapping, and can not accurately express the shape of each object on the surface (that is, deformation, such as the rectangle becomes parallel Quadrilateral, round into oval