NAME

       SoPickStyle -

       The SoPickStyle class is a node for setting up how to do picking.

       By default, all geometry in a scene is available for picking. Upon writing applications
       with interaction possibilities, this is often not what you want. To exclude parts of the
       scene graph from pick actions, use the SoPickStyle::UNPICKABLE.

SYNOPSIS

       #include <Inventor/nodes/SoPickStyle.h>

       Inherits SoNode.

   Public Types
       enum Style { SHAPE = SoPickStyleElement::SHAPE, BOUNDING_BOX =
           SoPickStyleElement::BOUNDING_BOX, UNPICKABLE = SoPickStyleElement::UNPICKABLE,
           SHAPE_ON_TOP = SoPickStyleElement::SHAPE_ON_TOP, BOUNDING_BOX_ON_TOP =
           SoPickStyleElement::BOUNDING_BOX_ON_TOP, SHAPE_FRONTFACES =
           SoPickStyleElement::SHAPE_FRONTFACES }

   Public Member Functions
       virtual SoType getTypeId (void) const
           Returns the type identification of an object derived from a class inheriting SoBase.
           This is used for run-time type checking and 'downward' casting.
       SoPickStyle (void)
       virtual void doAction (SoAction *action)
       virtual void callback (SoCallbackAction *action)
       virtual void pick (SoPickAction *action)

   Static Public Member Functions
       static SoType getClassTypeId (void)
       static void initClass (void)

   Public Attributes
       SoSFEnum style

   Protected Member Functions
       virtual const SoFieldData * getFieldData (void) const
       virtual ~SoPickStyle ()

   Static Protected Member Functions
       static const SoFieldData ** getFieldDataPtr (void)

   Additional Inherited Members

Detailed Description

       The SoPickStyle class is a node for setting up how to do picking.

       By default, all geometry in a scene is available for picking. Upon writing applications
       with interaction possibilities, this is often not what you want. To exclude parts of the
       scene graph from pick actions, use the SoPickStyle::UNPICKABLE.

       You can also optimize pick operations by using the SoPickStyle::BOUNDING_BOX pickstyle.

       FILE FORMAT/DEFAULTS:

       PickStyle {
           style SHAPE
       }

       See Also:
           SoRayPickAction

Member Enumeration Documentation

   enum SoPickStyle::Style
       Enumeration of the available picking strategies.

       Enumerator

       SHAPE  Do 'exact' picks, finding the correct intersection point(s), etc.

       BOUNDING_BOX
              Only compare pick intersection with the bounding boxes of shapes. This is usually
              much faster than SoPickStyle::SHAPE.

       UNPICKABLE
              The geometry following this node in the scene will not be available for picking.

       SHAPE_ON_TOP
              Do exact picks, like SHAPE, but sort the shape to the front of the list of picked
              points so it appears to be the frontmost item. This does not affect the
              SoPickedPoint pick coordinate though, just the sorting by depth done on the picked
              point list.

       Since:
           Coin 3.0

       BOUNDING_BOX_ON_TOP
              Do picks against the enclosing bounding box of the object, like BOUNDING_BOX, but
              sort the shape to the front of the list of picked points so it appears to be the
              frontmost item. This does not affect the SoPickedPoint pick coordinate though, just
              the sorting by depth done on the picked point list.

       Since:
           Coin 3.0

       SHAPE_FRONTFACES
              Do exact picks, like SHAPE, but cull all the backface intersections from the list.
              Note that this logic is relative to the ray, not the view, in case the ray and the
              view direction are not aligned.

       The behaviour of this setting will also depend on the SoShapeStyle vertexOrdering and
       shapeType setting, which are used to flip frontfaces to become backfaces and vice versa
       and to turn backface culling on and off.

       Since:
           Coin 3.0

Constructor & Destructor Documentation

   SoPickStyle::SoPickStyle (void)
       Constructor.

   SoPickStyle::~SoPickStyle () [protected],  [virtual]
       Destructor.

Member Function Documentation

   SoType SoPickStyle::getTypeId (void) const [virtual]
       Returns the type identification of an object derived from a class inheriting SoBase. This
       is used for run-time type checking and 'downward' casting. Usage example:

       void foo(SoNode * node)
       {
         if (node->getTypeId() == SoFile::getClassTypeId()) {
           SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
         }
       }

       For application programmers wanting to extend the library with new nodes, engines,
       nodekits, draggers or others: this method needs to be overridden in all subclasses. This
       is typically done as part of setting up the full type system for extension classes, which
       is usually accomplished by using the pre-defined macros available through for instance
       Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes),
       Inventor/engines/SoSubEngine.h (for engine classes) and so on.

       For more information on writing Coin extensions, see the class documentation of the
       toplevel superclasses for the various class groups.

       Implements SoBase.

   const SoFieldData * SoPickStyle::getFieldData (void) const [protected],  [virtual]
       Returns a pointer to the class-wide field data storage object for this instance. If no
       fields are present, returns NULL.

       Reimplemented from SoFieldContainer.

   void SoPickStyle::doAction (SoAction *action) [virtual]
       This function performs the typical operation of a node for any action.

       Reimplemented from SoNode.

   void SoPickStyle::callback (SoCallbackAction *action) [virtual]
       Action method for SoCallbackAction.

       Simply updates the state according to how the node behaves for the render action, so the
       application programmer can use the SoCallbackAction for extracting information about the
       scene graph.

       Reimplemented from SoNode.

   void SoPickStyle::pick (SoPickAction *action) [virtual]
       Action method for SoPickAction.

       Does common processing for SoPickAction action instances.

       Reimplemented from SoNode.

Member Data Documentation

   SoSFEnum SoPickStyle::style
       Which strategy to use for the picking actions for subsequent shapes in the scene graph.
       Default value is SoPickStyle::SHAPE.

Author

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