#!F-adobe-helvetica-medium-r-normal--18* #!N #!CDarkGreen #!N #!Rprobes Using Probes (Cursors) #!N #!EC #!Cbrown #!N #!F-adobe-times-medium-r-normal--18* #!Rtdcurs59 #!N #!N Graphics omitted from Online Documentation. Please see the manual. #!N Figure 59. 3-D Cursor with a Selected Point #!EF #!N #!EC #!N #!N A probe is a list of one or more vectors that represent points in the image. You can use them with Data Explorer modules that accept vectors as input, such as ClipPlane and Streamline. #!N #!N After you execute a visual program and have an image in the Image window, you can modify the visual program to include a #!F-adobe-times-bold-r-normal--18* Probe #!EF or #!F-adobe-times-bold-r-normal--18* ProbeList #!EF tool from the #!F-adobe-times-bold-r-normal--18* Special #!EF category. The probe tool accepts input from the 3-D cursor tool, specifying the points to use as vectors for input into another tool. The #!F-adobe-times-bold-r-normal--18* Probe #!EF tool accepts one point as its input; the #!F-adobe-times-bold-r-normal--18* ProbeList #!EF tool accepts multiple points as input. #!N #!N To use probes to select points for input into tools: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Execute a visual program to produce an image in the Image window. #!N #!I30 #!N 2. In the VPE, place one or more probe tools from the #!F-adobe-times-bold-r-normal--18* Special #!EF category in the visual program, connecting them to the tools for which you want to provide input. #!N #!N The probe icons are numbered as you place them on the canvas. For example, the first probe icon you place is labeled "Probe_1," the second "Probe_2," and so on. You can change the label of the icon by using its Configuration dialog box. #!N #!I30 #!N 3. In the #!F-adobe-times-bold-r-normal--18* View Control... #!EF dialog box, select #!F-adobe-times-bold-r-normal--18* Cursors #!EF mode from the #!F-adobe-times-bold-r-normal--18* Mode #!EF option box, or use the #!F-adobe-times-bold-r-normal--18* Ctrl+X #!EF accelerator key. A wire frame appears around the object. The dialog box changes to add the Probe controls. Select the probe you want to set by choosing the #!F-adobe-times-bold-r-normal--18* Probe(s) #!EF option box. This opens an options menu with a list of the available probes, from which you can select the desired probe. #!N #!I30 #!N 4. Use the mouse to select a point or points to use as input to the tool connected to the #!F-adobe-times-bold-r-normal--18* Probe #!EF or #!F-adobe-times-bold-r-normal--18* ProbeList #!EF icon. #!N #!N To add a point, double-click on the #!F-adobe-times-medium-i-normal--18* left #!EF mouse button inside the wire-frame box. A small square box appears, marking the point. #!N Note: The #!F-adobe-times-bold-r-normal--18* Probe #!EF tool allows only one point, while the #!F-adobe-times-bold-r-normal--18* ProbeList #!EF allows several. #!N #!N #!N To move a point, select the point by pressing the left mouse button with the mouse pointer positioned on it. When the left mouse button is depressed on the point, the three projections (one for each axis) appear inside the wire-frame box as dots, and the values for the #!F-adobe-times-medium-i-normal--18* x, y, #!EF and #!F-adobe-times-medium-i-normal--18* z #!EF coordinates are displayed on the right side of the Image window menu bar, as illustrated in #!Ltdcurs59,dxall321 f Figure 59 #!EL . You can move the point by dragging the selected point inside the box along the same direction as any of the axes. When you have moved the point to the desired area, release the left mouse button. #!N #!N Note that since perspective projection does not preserve parallel lines, the directions in the axes diagram do not necessarily correspond with the direction that the point moves in the Image window. However, these axes do correspond with the values of the coordinates. #!N #!N While using orthographic projection, the movement of the point in the Image window corresponds to the directions of the axes diagram. #!N #!N To delete a point, double click on it with the left mouse button. #!N #!N You can restrict the movement of the 3-D cursor with the #!F-adobe-times-bold-r-normal--18* Constraints #!EF option. Selecting the #!F-adobe-times-bold-r-normal--18* Constraints #!EF option box reveals an options menu that lets you choose which of the three axis projections to that movement is constrained. For example, if the #!F-adobe-times-medium-i-normal--18* x #!EF axis is selected from the cascade menu, you are able to move only the #!F-adobe-times-medium-i-normal--18* x #!EF projection in the 3-D cursor box. When cursor movement is constrained, the portion of the wire-frame box that corresponds to the selected axis is highlighted. To remove movement constraints on the cursors, select #!F-adobe-times-bold-r-normal--18* None #!EF from the options menu. #!N #!N Constraining is useful for more precise positioning of the cursor. Note that exact positioning is not possible with the 3-D cursor tool. #!N #!I30 #!N 5. Repeat the previous three steps for each probe icon in your visual program. #!N #!N Reexecute the visual program to implement the probes. #!N #!I0 #!N #!EF #!N #!N #!N While in #!F-adobe-times-bold-r-normal--18* Cursors #!EF mode, the center and right mouse buttons have the same functions as they do in #!F-adobe-times-bold-r-normal--18* Rotate #!EF mode. Note: You can also enable Probe (cursors) mode by using the #!F-adobe-times-bold-r-normal--18* intrctnMode #!EF parameter to the Image tool (see Image in IBM Visualization Data Explorer User's Reference). #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lpickin,dxall322 h Using Pick #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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