Hi Vincent,
> Do you mean that I have to initialize the Bounding Sphere of the PagedLOD
> node when I create it ? because I didn't found any special method in LOD or
> PagedLOD about that.
You obviously didn't look hard enough... in the LOD header you'll find:
/** Modes which control how the center of object should be
determined when computing which child is active.*/
enum CenterMode
{
USE_BOUNDING_SPHERE_CENTER,
USER_DEFINED_CENTER
};
/** Set how the center of object should be determined when
computing which child is active.*/
void setCenterMode(CenterMode mode) { _centerMode=mode; }
/** Get how the center of object should be determined when
computing which child is active.*/
CenterMode getCenterMode() const { return _centerMode; }
/** Sets the object-space point which defines the center of
the osg::LOD.
center is affected by any transforms in the hierarchy
above the osg::LOD.*/
inline void setCenter(const vec_type& center) {
_centerMode=USER_DEFINED_CENTER; _userDefinedCenter = center; }
/** return the LOD center point. */
inline const vec_type& getCenter() const { if
(_centerMode==USER_DEFINED_CENTER) return _userDefinedCenter; else
return getBound().center(); }
/** Set the object-space reference radius of the volume
enclosed by the LOD.
* Used to determine the bounding sphere of the LOD in the
absence of any children.*/
inline void setRadius(value_type radius) { _radius = radius; }
/** Get the object-space radius of the volume enclosed by the LOD.*/
inline value_type getRadius() const { return _radius; }
Use these user bounding sphere methods when your PagedLOD has all
external children to make sure it has a relevant bounding sphere.
Robert.
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