If what point the viewpoint is showing becomes unclear, please initialize in
menu [View] [Set view].
Rotate
It rotates the viewpoint.
The center of rotation changes according to Center of rotation in Configuration.
You can set up in Configuration when you want to rotate 360 degrees up and
down freely. And you can also change the type of rotation like a trackball
in the configuration.
You can rotate by dragging a mouse with pressing the right button on 3D
image without selecting this command at default setting.
Move
It moves the viewpoint.
If you use 3 button mouse, you can move by dragging a mouse with pressing
the middle button on 3D image without selecting this command at default
setting.
Zoom
It can zoom in and out by moving a mouse up and down.
You can zoom in by dragging a mouse with pressing both the right and the
left buttons on 3D image without selecting this command at default setting.
Perspective
It change the viewing angle.
Dolly
It changes the distance between the eye position and the fixation point without changing the viewing angle.