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知识梳理本节主要内容包括三视图、平行投影、中心投影.主视图反映物体的长和高,俯视图反映物体的长和宽,左视图反映物体的宽和高.平行投影的光线是平行的,而中心投影的光线是相交的,其交点处就是光源位置.“四点”解析本节的重点是三视图的画法和投影在实际生活中的应用,难点是画出立体图的表面展开图并能进行有关的计算.本节的易错点主要有:视图的画法有误,画图比例
The main contents of this section include three views, parallel projection, center projection.The main view reflects the object’s length and height, the top view reflects the object’s length and width, the left view reflects the object width and height.The parallel projection of the light is parallel, The central projection of the light is the intersection, the intersection is the light source position. “Four-point ” parsing This section focuses on the application of the three-view painting and projection in real life, the difficulty is to draw the surface of the three-dimensional map expansion Figure and can be related to the calculation. The error-prone points in this section are: the view of the painting is wrong, the proportion of drawing