#!F-adobe-helvetica-medium-r-normal--18* #!N #!CDarkGreen #!N #!Rzooming Zooming into and out of the Image #!N #!EC #!N #!N To zoom in or out (relative to the center of the Image window): #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N 1. Select the #!F-adobe-times-bold-r-normal--18* Zoom #!EF mode in the #!F-adobe-times-bold-r-normal--18* Mode #!EF option box, or use the #!F-adobe-times-bold-r-normal--18* Ctrl+Z #!EF accelerator key. #!N #!I30 #!N 2. To zoom in, press the #!F-adobe-times-medium-i-normal--18* left #!EF mouse button; to zoom out, press the #!F-adobe-times-medium-i-normal--18* right #!EF mouse button. Drag the mouse in the image area. This causes an overlay image of a rectangle to appear. As you move the mouse pointer away from the center of the window, the rectangle enlarges. As you move the mouse pointer towards the center of the window, the rectangle shrinks. Releasing the mouse button causes the image to zoom in or out, depending on which mouse button is pressed. If the left button (zoom in) is pressed, the portion of the image inside the rectangle is enlarged to fill the Image window. If the right button is pressed (zoom out), the image displayed in the Image window is reduced to the size of the rectangle. Note: You can also enable #!F-adobe-times-bold-r-normal--18* Zoom #!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 For both orthographic and perspective projection, zooming in makes the object appear larger in the Image window, while zooming out makes it appear smaller. However, the way that this is accomplished is different depending on which projection method is selected: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o While using perspective projection, zooming in or out changes the view angle, without changing the look-from point. #!N #!I30 #!N o While using orthographic projection, zooming in or out adjusts width of the image. The camera look-from point does not change, because with orthographic projection the look-from parameter merely specifies a direction, not a location in space. #!N #!I0 #!N #!EF #!N #!N #!N For more information about the projection methods, see #!Lprojmet,dxall302 h Changing the Projection Method #!EL . #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lroam,dxall307 h Changing the Look-to Point #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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