#!F-adobe-helvetica-medium-r-normal--18* #!N #!CDarkGreen #!N #!Rprojmet Changing the Projection Method #!N #!EC #!N #!N Data Explorer provides two methods of image projection. These methods make it possible to map a three-dimensional image onto a 2-dimensional screen. The two methods are: #!N #!I0 #!N #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* Perspective #!EF #!I50 #!N Perspective projection simulates normal camera and human visual systems, thereby providing realistic rendering of objects. While it is realistic, it does not preserve the exact shape and measurements of the object, and parallel lines usually do not project as being parallel. #!N #!I0 #!N #!F-adobe-times-bold-r-normal--18* Orthographic #!EF #!I50 #!N Orthographic projection provides a less realistic view of an object than perspective projection. However, orthographic projection does preserve exact scale measurements and parallel lines. One way to think about orthographic projection is that it is as if the distance between the front and back of an object is small, relative to the distance between the object and the camera. Orthographic is the default projection method. It is quicker to render an object in orthographic projection than in perspective. #!I0 #!N #!N #!N #!N The differences between these two methods become evident when using the view controls in certain modes. For example, the #!F-adobe-times-bold-r-normal--18* Zoom #!EF mode behavior depends on the projection method, as does the behavior of the 3-D cursor ( #!F-adobe-times-bold-r-normal--18* Roam #!EF and #!F-adobe-times-bold-r-normal--18* Cursors #!EF modes). The differences are discussed in the sections that discuss these modes. For more information about these projection methods, consult a computer graphics text. #!N #!N You can select the projection method by using the #!F-adobe-times-bold-r-normal--18* Projection #!EF option box on the #!F-adobe-times-bold-r-normal--18* View Control... #!EF dialog box. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Ltall304,dxall304 h Setting the View Angle #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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