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27.6.1 Using the Plane Tool

The plane tool allows you to interactively fine-tune the definition of a plane using graphics. Starting from an initial plane, you can translate, rotate, and resize the plane until its position, orientation, and size are as desired. For example, if you need to position a plane surface at a cross-section of an irregularly-shaped, curved duct, you can start with the plane tool near the desired location, resize it, translate it until it is within the duct walls, and rotate it to the proper orientation. (You may find it helpful to display grid faces to ensure that the plane tool is correctly positioned inside the domain.)



Initializing the Plane Tool


Before turning on the Plane Tool option, set the Points to suitable starting values. You can enter values manually, or use the Select Points button. Often it is convenient to display the grid for an inlet or isosurface that is similar to the desired plane surface, and then select three points on that grid to position the initial plane. Once you have specified the appropriate Points, activate the tool by turning on the Plane Tool option. The plane tool will appear in the graphics window, as shown in Figure  27.6.2.

Figure 27.6.2: The Plane Tool
figure

You can then translate, rotate, and/or resize the plane tool as described below.



Translating the Plane Tool


To translate the plane tool in the direction normal to the plane, click the mouse-probe button (the right button by default--see Section  28.3 for information about changing the mouse functions) anywhere on the gray part of the plane tool and drag the mouse until the tool reaches the desired location. Green arrows will show the direction of motion.

To translate the tool in the transverse directions (i.e., along either of the axes that lie within the plane), press the <Shift> key, click the mouse-probe button anywhere on the gray part of the plane tool, and drag the mouse until the tool reaches the desired location. Two sets of green arrows will show the possible directions of motion. If you find the perspective distracting when performing this type of translation, you can turn it off in the Camera Parameters panel (opened from the Views panel), as described in Section  28.4.2.



Rotating the Plane Tool


To rotate the plane tool, you will click the mouse-probe button on one of the white arrows at the tips of the plane's axes. Clicking on any arrow allows you to rotate the tool about either of the other two axes: when you click on the arrow, two green ribbons will encircle the plane tool, forming circles about each of the two possible axes of rotation. Drag the mouse along the desired circle to rotate the tool. As you do so, the circle along which the tool is rotating will become yellow.

The following notes may help you when you are rotating the plane tool:



Resizing the Plane Tool


If you plan to generate a bounded plane, you can resize the plane tool to define the plane's boundaries. Click the mouse-probe button in one of the white squares at the plane tool's corners and drag the mouse to stretch or shrink the tool. Green arrows will show the direction of the plane's diagonal.

figure   

Be careful not to drag your mouse across any of the axes while resizing the tool. This will flip the tool over and corrupt it. If you accidentally do this, reset the plane tool and start again.



Resetting the Plane Tool


If you "lose'' the plane tool, or want to reset it for any other reason, you can either click on the Reset Points button to return the plane tool to the default position and start from there, or turn the tool off and reinitialize it as described above. In the default position, the plane tool will lie midway along the $x$ length of the domain, spanning the $y$ and $z$ domain extents.


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