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projection
A shadow, the object is irradiated with light, is formed on a plane, called the object 投影, the irradiation light is called 投影线, where the projection plane is called 投影面.
If the light is a group of mutually parallel rays, such as ray flashlight projection formed at this time is called 平行投影.
If the light emitted from the same point formed a projection known 中心投影.
Three View
When we look at an object from a certain direction, as seen in the plane view is called a graphical object.
To be an object in three orthographic projection viewed, view objects, called the front face obtained was observed from front to back 主视图.
Top-down view of the object of observation, is called 俯视图. View of the object observed from left to right, is called 左视图.
FIG object is a three-view, it can understand to see.
