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核心知识梳理1.三视图(主视图、俯视图、左视图):用三个互相垂直的平面作为投影面,一个物体在三个投影面同时进行正投影,在正面内得到的由前向后观察物体的视图,叫做主视图;在水平面内得到的由上向下观察物体的视图,叫做俯视图;在侧面内得到的由左向右观察物体的视图,叫做左视图.将三个投影面展开在一个平面内,就得到这一物体的一张三视图.2.视点、视线与盲区:人朝着某个方向看时,眼睛的
Core Knowledge Combining 1. Three views (main view, top view, left view): Three planes perpendicular to each other as the projection surface, an object at the same time projection of the three projection surface, obtained in the front from the front to the back of the observation The view of the object, called the main view; the view of the object viewed from above in the horizontal plane is called the top view; the view from the left to the right of the object obtained in the side is called the left view. The three projection surfaces are expanded at A plane, you get a three-dimensional view of this object .2 point of sight, sight and blind zone: people looking in one direction, the eyes