The 3D axis shows the direction of the Cartesian coordinates in the 3D window. It consists of 3 legs, a tip at the end of each leg, and a label specifying X, Y, or Z beyond the tip. The axis can be drawn using lines, as shown below, or as a solid model using cylinders and cones. The labels are drawn with lines in both cases. The 3D Axis property page controls the appearance of the axis, including its size, line thicknesses, size of the solid elements, size of the labels, tip details, colors, and whether or not the tips and/or labels are shown.
The axis size is specified as a percentage of the average extent of the 3D scale box. In addition to entering the percentage on the 3D Axis property page, several mouse and key actions change the size. Moving the mouse with the right button and the a key held down scales the axis. When the a key is held, the zoom toolbar buttons and the numeric keypad + and - affect the axis size (instead of the overall image size). When both the Ctrl and a keys are held down, the numeric keypad + and - keys scale the axis in larger increments than without the ctrl key.
The axis center (where the 3 legs come together) can be specified either in absolute coordinates or relative to the center of the 3D scale box. The coordinates and interpretation choice are made on the 3D Axis property page. The axis can be moved interactively along each of the 3 principal directions by holding down the x, y, or z key and moving the mouse with the right button held down or pressing the arrow keys. When using the arrow keys, holding down the Shift key (along with x, y, or z) moves the axis in larger increments.
The Axis tab of the information window shows the position of the axis center. The absolute position is reported, even when the center is relative to the 3D scale box. When the tab is active, the axis can be used as 3D marker to query the coordinates of objects in the 3D display.
The property page contains an item to reset the center position to (0, 0, 0) following the import of a model by reading a MCNP or Sabrina input file. The position is not reset upon reading a checkpoint file (that presumably contains the position). The Axis submenu of the 3D context menu contains items to toggle the axis visibility, move the center position to the middle of the 3D scale box, to (0, 0, 0) or to the intersection of the 2D plot planes, and to show the property page.
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