"点线面"是个多义词，它可以指点线面（数学常识）,点线面（摄像机）。
根据正投影的机理，建立了点线面屏幕坐标与空间关系的转换关系。
According to mechanism of orthographic projection, this paper has set up the converted relation between screen coordinate and space coordinate.
师生情天长地久，加减乘除难算尽，点线面体又岂包完？祝教师节快乐！
Hard to calculate all teachers and students love everlasting, addition, subtraction, multiplication, and division, the body of point, line and plane is finished package? Happy teachers' day!
“金字塔”模式的内涵是：点线面结合，表浅里渗透、融会贯通、螺旋式升华。
Connotation of pyramid pattern includes combination of point and plane, unity of surface and depth, thorough acquaintance with knowledge and spiral rising development.
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