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chap-12 Three_Dimensional_Viewing

chap-12 Three_Dimensional_Viewing - Chapter 12...

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    Three-Dimensional Viewing Chapter 12
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Viewing Analogous to the photographing process  Camera position  Camera orientation
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Viewing Pipeline
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3d transformation pipeline General processing steps for modeling and  converting a world coordinate  description  of  a  scene  to  device  coordinates .  Once  the  scene  has  been  modeled, world coordinate positions are converted to viewing coordinates.  The  viewing  coordinate  system  is  used  in  graphics  packages  as  a  reference for specifying the observer viewing position and the position of  the projection plane. Next  projection operations are performed to convert  the viewing coordinate description of the scene to coordinate positions on  the projection plane, which will then will be mapped to the output device.   Objects  outside  the  specified  viewing  limits  are  clipped  from  further  consideration, and remaining objects are processed through visible surface  identification  and  surface  rendering  procedures  to  produce  the  display  within the device view port.
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Viewing-Coordinate System         Viewing -Coordinate System or View  Reference Coordinate System
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View plane  We  choose  a  particular  view  for  a  scene  by  first  establishing  the  viewing  coordinate  system,  also  called the view reference coordinate system.  A  view  plane  or  projection  plane,  is  then  set  up  perpendicular to the viewing Z axis. World coordinate  positions  in  the  scene  are  transformed  to  viewing  coordinates,  then  viewing  coordinates  are  projected  onto the view plane.
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To establish the viewing coordinate reference frame, first pick a  world coordinate position called the view reference point. This point 
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