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