Navigation Mode - Object (Default)
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Object mode navigation makes the user believe that he is holding the object
in his hand. This mode is used in the modeling and inspection of parts and
assemblies. This mode uses a smart algorithm to automatically set the
rotation center of the camera. While the entire scene is visible in the
viewport, the center of the scene is taken as the rotation center. When a
user zooms close to objects to investigate details, the rotation center is
set to a point on the 3D object’s surface that is in the middle of the
viewport. This mode is also most commonly used in the SOLIDWORKS
software.
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Navigation Mode - Camera
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Camera mode gives the user the impression that he is moving around in the
scene he is observing. A typical use for a camera mode is exploring virtual
sceneries, similar to the navigation known from first person games. This
mode requires the user to move and turn in the direction that the cap on the
3D Mouse moves, and causes the objects displayed to move in the opposite
direction to object mode described above. In camera mode, the center of
rotation is at the eye or view point (actually the position of the camera
itself).
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Navigation Mode - Fly
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Fly mode is used to describe navigation mode where the horizon is required
to always remain leveled or horizontal. Fly mode is the same as camera mode
with the additional horizontal constraint.
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