Quantcast Basic  orthographic  projection

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Figure 5-2.-Types of projections. (fig.  5-2)  is  further  classified  into  subtypes according   to   the   direction   of   its   projection lines  relative  to  the  plane  of  projection.  If  the projection  lines,  in  addition  to  being  parallel  to each  other,  are  perpendicular  (normal)  to  the plane of projection, the result is an  orthographic projection. If they are parallel to each other but oblique  to  the  plane  of  projection,  the  result  is an oblique projection. To better understand the theory of projection, you must become familiar with certain elements that are common to each type of projection. Some of  these  elements  are  defined  below. The   POINT   OF   SIGHT   (or   STATION POINT)  is  the  position  of  the  observer  in relation to the object and the plane of projection (fig.  5-2).  It  is  from  this  point  that  the  view  of the object is taken. The point of sight is changed to give different views of the same object; hence, there must be a different point of sight for each view. Imagine yourself looking first at the front of  an  object,  then  down  at  the  top,  and  then  at the  right  or  left  side,  as  the  case  may  be.  Each additional  view  requires  a  new  point  of  sight. The observer views the features of the object through  an  imaginary  PLANE  OF  PROJEC- TION  (or  IMAGE  PLANE).  In  parallel  projec- tion, this theoretical transparent plane is placed between  the  point  of  sight  and  the  object,  as shown in figure 5-2. For perspective pictorials, it Figure  5-3.-Basic  orthographic  projection. 5-2

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