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#!CNavyBlue
#!N #!Rpkse The Pick Structure #!N #!EC #!N #!N Picking is
the selection of a location on an object in an image
by use of the mouse. A straight line from the camera
through the location selected constitutes a "poke," which may intersect the
object in the image in one or more places or in
none at all. The intersections are called "picks." For example, a
poke through a spherical isosurface results in two picks: one on
the "front" surface and one on the "back." Picks differ from
probes in that probes may be present anywhere in 3-dimensional space,
picks only on the surface of an object. #!N #!N The
pick structure is a Field, and the picked points are listed
in its "positions" component. A number of routines in Data Explorer
allow you to query the pick structure output by the Pick
tool and to traverse a picked Object. (See #!Lpies,dxall1123 h Pick-Assistance Routines #!EL for details.)
The structure includes information on how to traverse the picked Object
to reach the picked element. It also identifies: #!N #!I0 #!N
#!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N o the connection in which the
picked point resides (the element ID) #!N #!I30 #!N o the
vertex of the picked element closest to the picked point (the
vertex ID) #!N #!I30 #!N o the position of the picked
point itself. #!N #!I0 #!N #!EF #!N #!N #!N If the
picked Object has no connections, the element ID and the vertex
ID both refer to the position closest to the picked point.
Other information can be accessed with pick-assistance routines. Note: For a
module that uses the pick structure, the Object displayed in the
image being picked must (1) be the same as the Object
passed to the module or (2) have a matching Object hierarchy.
The reason for this requirement is that the output of the
Pick tool describes the location of the picked Object as it
exists in the hierarchy of the rendered Object. To use the
pick structure, therefore, requires an Object with a matching structure. #!N
#!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lshowp,dxall1041 h ShowPick Module Example--Using Color to Show a Picked Object #!EL #!N #!F-adobe-times-medium-i-normal--18*
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