66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
#ifndef OSG_LOD
|
|
#define OSG_LOD 1
|
|
|
|
#include <osg/Group>
|
|
|
|
namespace osg {
|
|
|
|
/** LOD - Level Of Detail group node which allows switching between children
|
|
depending on distance from eye point.
|
|
Typical uses are for load balancing - objects further away from
|
|
the eye point are rendered at a lower level of detail, and at times
|
|
of high stress on the graphics pipeline lower levels of detail can
|
|
also be chosen.
|
|
*/
|
|
class SG_EXPORT LOD : public Group
|
|
{
|
|
public :
|
|
LOD() {}
|
|
|
|
virtual Object* clone() const { return new LOD(); }
|
|
virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const LOD*>(obj)!=NULL; }
|
|
virtual const char* className() const { return "LOD"; }
|
|
virtual void accept(NodeVisitor& nv) { nv.apply(*this); }
|
|
virtual void traverse(NodeVisitor& nv);
|
|
|
|
/** Sets the value of range list element index to range which
|
|
is a floating point distance specified in world coordinates.
|
|
Range list automatically expands to accomodate values beyond
|
|
the current getNumRanges().*/
|
|
void setRange(const unsigned int index, const float range);
|
|
|
|
/** returns the range for specified index.*/
|
|
inline const float getRange(const unsigned int index) const { return _rangeList[index]; }
|
|
|
|
/** returns the number of ranges currently set.*/
|
|
inline const int getNumRanges() const { return _rangeList.size(); }
|
|
|
|
/** 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 Vec3 ¢er) { _center = center; }
|
|
|
|
/** return the LOD center point. */
|
|
inline const Vec3& getCenter() const { return _center; }
|
|
|
|
|
|
/** return the child to traverse.
|
|
Selected by the distance between the eye point in local
|
|
coordinates and the LOD center, mutliplied by the bias.*/
|
|
const int evaluate(const Vec3& eye_local,const float bias=1.0f) const;
|
|
|
|
|
|
protected :
|
|
virtual ~LOD() {}
|
|
|
|
typedef std::vector<float> RangeList;
|
|
RangeList _rangeList;
|
|
RangeList _rangeList2;
|
|
|
|
Vec3 _center;
|
|
|
|
};
|
|
|
|
};
|
|
|
|
#endif
|