It is common to create Curve plots when analysing a simulation database. Curve plots are created using VisIt's lineout mechanism where reference lines are drawn in a visualization window and Curve plots are created in another visualization window using the path described by the reference lines. VisIt's line tool allows reference lines to be moved after they are initially drawn. The line tool allows the user to see a representation of a line in a visualization window and position the line relative to plots that exist in the window.
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Figure 4 |
In 2D, the line endpoints can only be moved in the X-Y plane (figure). In 3D, the line endpoints can be moved in any dimension. Since it is more difficult to see how the line is oriented relative to plots in 3D, when the line tool is moved, 3D crosshairs appear. The crosshairs intersect the bounding box and show the position of the line endpoint relative to the plots. Clicking and dragging endpoints will move them in a plane that is perpendicular to the screen. Moving the endpoints, while first pressing and holding down the Shift key, causes the selected endpoint to move back and forth in the dimension that most faces the screen. This allows endpoints to be moved in one dimension at a time. An example of the line tool in 3D is shown in figure.
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Figure 5 |