Time Frame Control Widgets: Main Window. Pull-down Menu Items:

3-D Select and View Control Icons:

Beneath the row of Menu items, appears a row of radio-button icons for point, line, plane (in each coordinate direction) and 3D region selections. By choosing an icon, one may use the left mouse button in the Draw area to select points, lines, planes, and regions in 3D. For Line and Region selection, one uses `clicking and dragging': the mouse-down will select the first point and mouse-release will select the second vertex.
Following the 3D-Select icons, are three radio-buttons for View control (Rotate, Pan, and Zoom). Selecting one of these buttons provides a left mouse button view control with that attribute by `clicking and dragging'. For example, selecting Pan allows one to translate the model data. Selecting Zoom and moving the mouse up and down will zoom in and out, while selecting Rotate allows one to change the orientation of the model data (as if the user had a handle from the mouse position to the center of the data). More precise views (important for creating animated sequences) can be obtained using the View item under Tools, which brings up a tightly coupled View widget.
By selecting Zoom on a three-button mouse, the middle button can be used for rotation and the right button can be used for Pan. On a two-button mouse the middle button may be realized by simultaneously depressing both buttons.