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The Selection Box is used to select part of the cave for viewing. When the box is contracted, the view is zoomed or magnified because a smaller part of the cave is selected. To give you more control over this selection process, the Viewer gives you control over the way the Selection Box is expanded or contracted. You can set the mode by choosing the "Preferences|Settings" option from the menu bar. There are two options called "Center Zoom Mode" and "Corner Zoom Mode."
Center Zoom Mode. In Center Zoom Mode, the box expands and contracts around the center of the box. Center Zoom is useful for zooming in on a particular point in the cave. You just start with the mouse cursor on the point you are interested in and then drag. The box will expand around the starting point and will always remain centered on the starting point.
Corner Zoom Mode. In Corner Zoom Mode, the box expands and contracts around one corner of the box. Depending on which direction you are dragging, the change can be centered around any corner of the box. However, it will always be centered on the starting point. If you are using the Tool Bar or keyboard commands to manipulate the Selection Box, the zoom will always be centered on the lower-left corner.
Corner Zoom is useful for selecting a group of passages in the cave. You just start with the mouse cursor to one side of the area of interest, and drag the cursor to the other. When you are done, the Selection Box will enclose the passages you are interested in.