A camera is necessary element for visualizing three-dimensional objects, that determines the point and direction of viewing the 3D scene. Each 3D window provides a system camera installed "by default". The user can additionally create one's own cameras and make one of them active.
A camera has its own coordinate system and a set of manipulators. The manipulators allows you to translate the existing cameras around the 3D scene and change their viewing direction. This can be used when examining inner elements of the scene and creating animation clips.
The system camera activates upon opening a new 3D window. Initially, it is located at the distance that permits watching all elements in the 3D scene.
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