Ubuntu Manpage: SoDirectionalLightManip — directional light node with 3D interface for editing direction

Provided by: inventor-doc_2.1.5-10-18_all

NAME

       SoDirectionalLightManip — directional light node with 3D interface for editing direction

INHERITS FROM

       SoBase    >    SoFieldContainer    >    SoNode    >   SoLight   >   SoDirectionalLight   >
       SoDirectionalLightManip

SYNOPSIS

       #include <Inventor/manips/SoDirectionalLightManip.h>

          Fields from class SoDirectionalLight:

     SoSFVec3f           direction

          Fields from class SoLight:

     SoSFBool            on
     SoSFFloat           intensity
     SoSFColor           color

          Methods from class SoDirectionalLightManip:

                         SoDirectionalLightManip()
     SoDragger *         getDragger()
     SbBool              replaceNode(SoPath *p )
     SbBool              replaceManip(SoPath *p, SoDirectionalLight *newOne ) const
     static SoType       getClassTypeId()

          Methods from class SoNode:

     void                setOverride(SbBool state)
     SbBool              isOverride() const
     SoNode *            copy(SbBool copyConnections = FALSE) const
     virtual SbBool      affectsState() const
     static SoNode *     getByName(const SbName &name)
     static int          getByName(const SbName &name, SoNodeList &list)

          Methods from class SoFieldContainer:

     void                setToDefaults()
     SbBool              hasDefaultValues() const
     SbBool              fieldsAreEqual(const SoFieldContainer *fc) const
     void                copyFieldValues(const SoFieldContainer  *fc,  SbBool  copyConnections  =
                              FALSE)
     SbBool              set(const char *fieldDataString)
     void                get(SbString &fieldDataString)
     virtual int         getFields(SoFieldList &resultList) const
     virtual SoField *   getField(const SbName &fieldName) const
     SbBool              getFieldName(const SoField *field, SbName &fieldName) const
     SbBool              isNotifyEnabled() const
     SbBool              enableNotify(SbBool flag)

          Methods from class SoBase:

     void                ref()
     void                unref() const
     void                unrefNoDelete() const
     void                touch()
     virtual SoType      getTypeId() const
     SbBool              isOfType(SoType type) const
     virtual void        setName(const SbName &name)
     virtual SbName      getName() const

DESCRIPTION

SoDirectionalLightManip is the base class for all SoDirectionalLight nodes that have a
built-in 3D user interface (this is the only such class provided with the Inventor
toolkit). Since it is derived from SoDirectionalLight, any changes to its fields result in
a change of lighting for nodes that follow it in the scene graph. In this case, the
interface edits the direction field. Also, the color of the manipulator's geometry will
reflect the color of the light (but you cannot edit the color using this manipulator).

Typically, you will want to replace a regular SoDirectionalLight with an
SoDirectionalLightManip (as when the user selects a light to be edited), or vice versa (as
when the user is done moving the light and the interface should go away). Use the
replaceNode() method to insert a manipulator into a scene graph, and the replaceManip()
method to remove it when done.

The SoDirectionalLightManip utilizes an SoDirectionalLightDragger to provide a 3D
interface. However, the manipulator differs from the dragger; it lights other objects in
the scene because, as an SoDirectionalLight, it alters the state. The field values and
movement of the dragger, on the other hand, affect only the dragger itself. To find out
more about how the interface works and what each part will do, see the reference page for
SoDirectionalLightDragger. The interfaces of the dragger and the manipulator are
identical.

The SoDirectionalLightManip utilizes its dragger by adding it as a hidden child. When an
action is applied to the manipulator, such as rendering or handling events, the
manipulator first traverses the dragger, and then the manipulator adds its lighting
parameters to the state. When you click-drag-release over the manipulator, it passes these
events down to the dragger, which moves as a result ("I can't help it, I'm a dragger!").

The manipulator maintains consistency between the fields of the dragger and its own
fields. Let's say you use the mouse to rotate the dragger. Callbacks ensure that the
direction field of the manipulator will change by the same amount, thus changing the
lighting of nodes which follow in the scene graph. Similarly, if you set the direction
field of the SoDirectionalLightManip, the manipulator will orient the dragger accordingly.

Because the dragger is a hidden child, you can see the dragger on screen and interact with
it, but the dragger does not show up when you write the manipulator to file. Also, any
SoPath will end at the manipulator. (See the Actions section of this reference page for a
complete description of when the dragger is traversed).

If you want to get a pointer to the dragger you can get it from the manipulator using the
getDragger() method. You will need to do this if you want to change the geometry of a
manipulator, since the geometry actually belongs to the dragger.

METHODS

SoDirectionalLightManip()
Constructor.

SoDragger * getDragger()
Returns a pointer to the dragger being used by this manipulator. Given this pointer,
you can customize the dragger just like you would any other dragger. You can change
geometry using the setPart() method, or add callbacks using the methods found in the
SoDragger reference page.

SbBool replaceNode(SoPath *p )
Replaces the tail of the path with this manipulator. The tail of the path must be an
SoDirectionalLight node (or subclass thereof). If the path has a nodekit, this will try
to use setPart() to insert the manipulator. Otherwise, the manipulator requires that
the next to last node in the path chain be a group.

The field values from the directional light node will be copied to this manipulator,
and the light node will be replaced.

The manipulator will not call ref() on the node it is replacing. The old node will
disappear if it has no references other than from the input path p and its parent,
since this manipulator will be replacing it in both of those places. Nor will the
manipulator make any changes to field connections of the old node. The calling process
is thus responsible for keeping track of its own nodes and field connections.

SbBool replaceManip(SoPath *p, SoDirectionalLight *newOne ) const
Replaces the tail of the path, which must be this manipulator, with the given
SoDirectionalLight node. If the path has a nodekit, this will try to use setPart() to
insert the new node. Otherwise, the manipulator requires that the next to last node in
the path chain be a group.

The field values from the manipulator will be copied to the directional light node, and
the manipulator will be replaced.

The manipulator will not call ref() or unref() on the node which is replacing it, nor
will it make any changes to field connections. The calling process is thus responsible
for keeping track of its own nodes and field connections.

static SoType getClassTypeId()
Returns type identifier for this class.

ACTION BEHAVIOR

       SoGLRenderAction,     SoCallbackAction,     SoGetBoundingBoxAction,     SoGetMatrixAction,
       SoHandleEventAction, SoRayPickAction
          First, traverses the dragger the way an SoGroup would. All draggers place themselves in
          space,  but  leave  the  current  transformation  unchanged  when  finished.  Then  the
          SoDirectionalLightManip adds a directional light to the state just like its base class,
          SoDirectionalLight.

     SoSearchAction
          Searches just like an SoDirectionalLight. Does not  search  the  dragger,  which  is  a
          hidden child.

     SoWriteAction
          Writes  out  just  like  an  SoDirectionalLight. Does not write the dragger, which is a
          hidden child. If you really need to write valuable information about the dragger,  such
          as  customized  geometry, you can retrieve the dragger with the getDragger() method and
          then write it out separately.

FILE FORMAT/DEFAULTS

       DirectionalLightManip {
          on         TRUE
          intensity  1
          color      1 1 1
          direction  0 0 -1
     }