SoLOD(3IV)

NAME
     SoLOD (SoLOD) - distance-based level-of-detail switching group node

INHERITS FROM
     SoBase > SoFieldContainer > SoNode > SoGroup > SoLOD

SYNOPSIS
     #include <Inventor_c/nodes/SoLOD.h>

          Fields from class SoLOD:

     SoMFFloat           range
     SoSFVec3f           center

          Functions from class SoLOD:

     SoLOD *             SoLODCreate()
     SoType              SoLODGetClassTypeId()

          Functions from class SoGroup:

     void                SoLODAddChild(SoLOD *this, SoNode *child)
     void                SoLODInsertChild(SoLOD *this, SoNode *child, int
                              newChildIndex)
     SoNode *            SoLODGetChild(const SoLOD *this, int index)
     int                 SoLODFindChild(const SoLOD *this, const SoNode
                              *child)
     int                 SoLODGetNumChildren(const SoLOD *this)
     void                SoLODRemoveChild(SoLOD *this, int index)
     void                SoLODRemoveChildNode(SoLOD *this, SoNode *child)
     void                SoLODRemoveAllChildren(SoLOD *this)
     void                SoLODReplaceChild(SoLOD *this, int index, SoNode
                              *newChild)
     void                SoLODReplaceChildNode(SoLOD *this, SoNode *oldChild,
                              SoNode *newChild)

          Functions from class SoNode:

     void                SoLODSetOverride(SoLOD *this, SbBool state)
     SbBool              SoLODIsOverride(const SoLOD *this)
     SoNode *            SoLODCopy(const SoLOD *this, SbBool copyConnections =
                              FALSE)
     SbBool              SoLODAffectsState(const SoLOD *this)
     SoNode *            SoLODGetByName(const char *name)
     int                 SoLODGetByNameList(const char *name, SoNodeList
                              *list)

          Functions from class SoFieldContainer:

     void                SoLODSetToDflts(SoLOD *this)
     SbBool              SoLODHasDfltVals(const SoLOD *this)
     SbBool              SoLODFldsAreEq(const SoLOD *this, const
                              SoFieldContainer *fc)
     void                SoLODCopyFieldVals(SoLOD *this, const
                              SoFieldContainer *fc, SbBool copyConnections =
                              FALSE)
     SbBool              SoLODSet(SoLOD *this, const char *fieldDataString)
     void                SoLODGet(SoLOD *this, SbString *fieldDataString)
     int                 SoLODGetFields(const SoLOD *this, SoFieldList
                              *resultList)
     SoField *           SoLODGetField(const SoLOD *this, const char
                              *fieldName)
     SbBool              SoLODGetFieldName(const SoLOD *this, const SoField
                              *field, SbName *fieldName)
     SbBool              SoLODIsNotifyEnabled(const SoLOD *this)
     SbBool              SoLODEnableNotify(SoLOD *this, SbBool flag)

          Functions from class SoBase:

     void                SoLODRef(SoLOD *this)
     void                SoLODUnref(const SoLOD *this)
     void                SoLODUnrefNoDelete(const SoLOD *this)
     void                SoLODTouch(SoLOD *this)
     SoType              SoLODGetTypeId(const SoLOD *this)
     SbBool              SoLODIsOfType(const SoLOD *this, SoType type)
     void                SoLODSetName(SoLOD *this, const char *name)
     SbName              SoLODGetName(const SoLOD *this)


DESCRIPTION
     This group node is used to allow applications to switch between various
     representations of objects automatically. The children of this node
     typically represent the same object or objects at varying levels of
     detail, from highest detail to lowest. The distance from the world-space
     eye point to the transformed center of the LOD is computed, and one child
     is drawn, based on the values in the ranges field.

     More precisely, if the distance from the world-space eyepoint to the
     transformed center is D and the ranges array contains LAST_RANGE+1 values
     (numbered 0...LAST_RANGE), then:



              if D < ranges[0]                    : Child 0 is drawn
              else if ranges[i-1] < D < ranges[i] : Child i is drawn
              else if D > ranges[LAST_RANGE]      : Child LAST_RANGE+1 is drawn



     Thus, N ranges and N+1 children should be specified. If you specify too
     few children, the last child will be used for the extra ranges. If you
     specify too few ranges, the extra children will never be used.
     It is often useful to define the lowest detail child to be an SoInfo
     node. This causes the object to completely disappear if it is far enough
     away from the eyepoint. Defining the highest detail child to be an SoInfo
     node can also be useful if you want the object to disappear if it gets
     too close to the eyepoint.

FIELDS
     SoMFFloat           range
          World-space distances to use as switching criteria.

     SoSFVec3f           center
          Object-space center of the model.


FUNCTIONS
     SoLOD *             SoLODCreate()
          Creates a distance-based level-of-detail node with default settings.

     SoType              SoLODGetClassTypeId()
          Returns type identifier for this class.


ACTION BEHAVIOR
     SoGLRenderAction, SoRayPickAction, SoCallbackAction
          Only the child with the appropriate level of detail is traversed.

     others
          All implemented as for SoGroup.


FILE FORMAT/DEFAULTS
     LOD {
          center  0 0 0
          range   [  ]
     }

SEE ALSO
     SoSwitch, SoGroup