#!F-adobe-helvetica-medium-r-normal--18* #!N #!CDarkGreen #!N #!Rroam Changing the Look-to Point #!N #!EC #!N #!N Data Explorer maintains the look-to point at the center of the Image window. You can use the #!F-adobe-times-bold-r-normal--18* Roam #!EF mode to change the look-to point. #!N #!N To change the look-to point: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Select the #!F-adobe-times-bold-r-normal--18* Roam #!EF mode by using the #!F-adobe-times-bold-r-normal--18* Mode #!EF option box or the #!F-adobe-times-bold-r-normal--18* Ctrl+W #!EF accelerator key. #!N #!I30 #!N 2. A wire-frame box appears around the image. The current look-to point is marked by a small square box. To move the look-to point, select the point by pressing the #!F-adobe-times-medium-i-normal--18* left #!EF mouse button and holding the mouse pointer on it. You can then move the cursor by dragging the selected point inside the box. When the left mouse button is depressed on the point, the mouse cursor disappears (the look-to point remains) and the three projections (one for each axis) appear inside the wire-framed box as dots, similar to the 3-D cursor function illustrated in #!Ltdcurs59,dxall321 f Figure 59 #!EL . When you release the mouse button, the location of the point becomes the new look-to point, and the image view is updated. #!N #!N Alternatively, double-clicking on a point in the Image window changes the look-to point to the position on which you double-click. You can set the look-to point to a location outside the current boundary box of the object using this method. Note: You can also enable #!F-adobe-times-bold-r-normal--18* Roam #!EF 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 #!I0 #!N #!EF #!N #!N #!N The directions of the axes are indicated by a wire-frame 3-D axes diagram in the lower right-hand corner of the Image window. To move the look-to point, the movement of the mouse must be along the same direction as one of the axes. If you move the mouse in a direction that does not correspond to any of the axes directions, the point does not move. Because of this, the movement of the look-to point is constrained to six directions (i.e., the positive and negative directions for each of the three axes). #!N #!N Note that since perspective projection does not preserve parallel lines, the directions in the axes diagram do not necessarily correspond to 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 with the directions of the axes diagram. #!N #!N The #!F-adobe-times-bold-r-normal--18* Constraints #!EF option appears in the #!F-adobe-times-bold-r-normal--18* View Control... #!EF dialog box when you select #!F-adobe-times-bold-r-normal--18* Roam #!EF mode. #!N #!N You can further restrict the movement of the look-to point by using the #!F-adobe-times-bold-r-normal--18* Constraints #!EF option. This allows you to constrain movement of the point to two directions (i.e., the positive and negative directions of a particular axis). Select an axis to restrict movement to by clicking on the #!F-adobe-times-bold-r-normal--18* Constraints #!EF option box and selecting the desired axis (X, Y, or Z). Once this is done, you are able to move the look-to point along only the selected axis, while the values of the other two axes remain constant. #!N #!N You may want to position the cursor in two steps, using different views for each step. For example, you can position the #!F-adobe-times-medium-i-normal--18* x #!EF and #!F-adobe-times-medium-i-normal--18* y #!EF coordinates using the front view, and the #!F-adobe-times-medium-i-normal--18* z #!EF coordinate using the side view. #!N #!N To release the constraints on an axis, choose the #!F-adobe-times-bold-r-normal--18* None #!EF option. #!N #!N While in #!F-adobe-times-bold-r-normal--18* Roam #!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. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lpanzoom,dxall308 h Panning and Zooming into and out of the Image #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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