SoRayPickAction — intersects objects with a ray cast into scene

       This class performs picking by casting a ray into a scene and performing  intersection  tests  with  each
       object. The ray is extended to be a cone or cylinder, depending on the camera type, for intersection with
       points and lines. Each intersection is returned as an SoPickedPoint instance.

       The  picking  ray can be specified as either a ray from the camera location through a particular viewport
       pixel, or as a world-space ray. In the former case, a valid camera must be encountered  during  traversal
       of the graph to determine the location of the ray in world space.

       Callers  can  cause the action to compute all intersections along the ray (sorted closest to farthest) by
       setting the pickAll flag to TRUE. By default, the action  computes  only  the  closest  intersection.  In
       either case, the intersections are returned in an SoPickedPointList. Each intersection can be examined by
       accessing  the appropriate SoPickedPoint in the list. The SoPickedPoint class provides methods to get the
       intersection point, normal, and other info.

       SoAction > SoPickAction > SoRayPickAction

SoRayPickAction(constSbViewportRegion&viewportRegion)
          Constructor takes viewport region to use for picking.  Even  though  the  picking  operation  may  not
          involve a window per se, some nodes need this information to determine their size and placement.

     voidsetPoint(constSbVec2s&viewportPoint)
          Sets  the  viewport-space  point  through  which  the  ray passes, starting at the camera's viewpoint.
          Viewport coordinates range from (0,0) at the lower left to (width-1,height-1) at the upper right.

     voidsetNormalizedPoint(constSbVec2f&normPoint)
          Sets the viewport point in normalized coordinates, which range from (0,0) at the lower left  to  (1,1)
          at the upper right.

     voidsetRadius(floatradiusInPixels)
          Set  the  radius  (in  pixels)  around  the point. This is used when testing the ray against lines and
          points. By default, the radius is 5 pixels. For perspective cameras, the ray is extended to be a  cone
          when testing against lines and points. For orthographic cameras, the ray is extended to be a cylinder.
          The radius has no effect for shapes of other types.

     voidsetRay(constSbVec3f&start,constSbVec3f&direction,floatnearDistance=-1.0,floatfarDistance=-1.0)
          Sets a world-space ray along which to pick. The ray is defined as a world  space  starting  point  and
          direction  vector.  The  direction vector will be normalized automatically. The last two arguments are
          the parametric distances between which intersections along the  ray  must  occur.  The  distances  are
          measured  as  if  the  direction vector is unit length; e.g., if nearDistance is 2.0, the intersection
          must occur past (start + 2*(length of the direction vector)) units along the ray. These distances  can
          be used to achieve near and far plane clipping. A negative distance (such as the default values) means
          disable clipping to that plane.

     voidsetPickAll(SbBoolflag)SbBoolisPickAll()const
          Sets/returns whether the action will return all objects intersected or just the closest one.

     constSoPickedPointList&getPickedPointList()const
          Returns list of picked points.

     SoPickedPoint*getPickedPoint(intindex=0)const
          Returns the indexed picked point from the list.

       SoRayPickAction — intersects objects with a ray cast into scene

SoPickedPoint,SoPickedPointListSoRayPickAction(3IV)()

#include<Inventor/actions/SoRayPickAction.h>

          Methods from class SoRayPickAction:

                                SoRayPickAction(constSbViewportRegion&viewportRegion)voidsetPoint(constSbVec2s&viewportPoint)voidsetNormalizedPoint(constSbVec2f&normPoint)voidsetRadius(floatradiusInPixels)voidsetRay(constSbVec3f&start,constSbVec3f&direction,floatnearDistance=-1.0,floatfarDistance=-1.0)voidsetPickAll(SbBoolflag)SbBoolisPickAll()constconstSoPickedPointList&getPickedPointList()constSoPickedPoint*getPickedPoint(intindex=0)const

          Methods from class SoPickAction:

     voidsetViewportRegion(constSbViewportRegion&newRegion)constSbViewportRegion&getViewportRegion()const

          Methods from class SoAction:

     virtualvoidapply(SoNode*node)virtualvoidapply(SoPath*path)virtualvoidapply(constSoPathList&pathList,SbBoolobeysRules=FALSE)staticSoTypegetClassTypeId()virtualSoTypegetTypeId()virtualSbBoolisOfType(SoTypetype)virtualvoidinvalidateState()