OpenSceneGraph  3.0.1
Classes | Public Types | Public Member Functions | Protected Attributes
osgUtil::PolytopeIntersector Class Reference

Concrete class for implementing polytope intersections with the scene graph. More...

Inheritance diagram for osgUtil::PolytopeIntersector:
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List of all members.

Classes

struct  Intersection

Public Types

enum  { DimZero = (1<<0), DimOne = (1<<1), DimTwo = (1<<2), AllDims = (DimZero | DimOne | DimTwo) }
 dimension enum to specify primitive types to check. More...
typedef std::set< IntersectionIntersections

Public Member Functions

 PolytopeIntersector (const osg::Polytope &polytope)
 Construct a PolytopeIntersector using specified polytope in MODEL coordinates.
 PolytopeIntersector (CoordinateFrame cf, const osg::Polytope &polytope)
 Construct a PolytopeIntersector using specified polytope in specified coordinate frame.
 PolytopeIntersector (CoordinateFrame cf, double xMin, double yMin, double xMax, double yMax)
 Convenience constructor for supporting picking in WINDOW, or PROJECTION coordinates In WINDOW coordinates (clip space cube) creates a five sided polytope box that has a front face at 0.0 and sides around box xMin, yMin, xMax, yMax.
void insertIntersection (const Intersection &intersection)
IntersectionsgetIntersections ()
Intersection getFirstIntersection ()
unsigned int getDimensionMask () const
void setDimensionMask (unsigned int dimensionMask)
 set the dimension mask.
const osg::PlanegetReferencePlane () const
void setReferencePlane (const osg::Plane &plane)
 set the plane used to sort the intersections.
virtual Intersectorclone (osgUtil::IntersectionVisitor &iv)
virtual bool enter (const osg::Node &node)
virtual void leave ()
virtual void intersect (osgUtil::IntersectionVisitor &iv, osg::Drawable *drawable)
virtual void reset ()
virtual bool containsIntersections ()

Protected Attributes

PolytopeIntersector_parent
osg::Polytope _polytope
unsigned int _dimensionMask
 mask which dimensions should be checked
osg::Plane _referencePlane
 plane to use for sorting intersections
Intersections _intersections

Detailed Description

Concrete class for implementing polytope intersections with the scene graph.

To be used in conjunction with IntersectionVisitor.


Member Typedef Documentation


Member Enumeration Documentation

anonymous enum

dimension enum to specify primitive types to check.

Enumerator:
DimZero 

check for points

DimOne 

check for lines

DimTwo 

check for triangles, quad

AllDims 

Constructor & Destructor Documentation

osgUtil::PolytopeIntersector::PolytopeIntersector ( const osg::Polytope polytope)

Construct a PolytopeIntersector using specified polytope in MODEL coordinates.

osgUtil::PolytopeIntersector::PolytopeIntersector ( CoordinateFrame  cf,
const osg::Polytope polytope 
)

Construct a PolytopeIntersector using specified polytope in specified coordinate frame.

osgUtil::PolytopeIntersector::PolytopeIntersector ( CoordinateFrame  cf,
double  xMin,
double  yMin,
double  xMax,
double  yMax 
)

Convenience constructor for supporting picking in WINDOW, or PROJECTION coordinates In WINDOW coordinates (clip space cube) creates a five sided polytope box that has a front face at 0.0 and sides around box xMin, yMin, xMax, yMax.

In PROJECTION coordinates (clip space cube) creates a five sided polytope box that has a front face at -1 and sides around box xMin, yMin, xMax, yMax. In VIEW and MODEL coordinates (clip space cube) creates a five sided polytope box that has a front face at 0.0 and sides around box xMin, yMin, xMax, yMax.


Member Function Documentation

virtual Intersector* osgUtil::PolytopeIntersector::clone ( osgUtil::IntersectionVisitor iv) [virtual]

Implements osgUtil::Intersector.

virtual bool osgUtil::PolytopeIntersector::containsIntersections ( ) [inline, virtual]

Implements osgUtil::Intersector.

virtual bool osgUtil::PolytopeIntersector::enter ( const osg::Node node) [virtual]

Implements osgUtil::Intersector.

unsigned int osgUtil::PolytopeIntersector::getDimensionMask ( ) const [inline]
Intersection osgUtil::PolytopeIntersector::getFirstIntersection ( ) [inline]
Intersections& osgUtil::PolytopeIntersector::getIntersections ( ) [inline]
const osg::Plane& osgUtil::PolytopeIntersector::getReferencePlane ( ) const [inline]
void osgUtil::PolytopeIntersector::insertIntersection ( const Intersection intersection) [inline]
virtual void osgUtil::PolytopeIntersector::intersect ( osgUtil::IntersectionVisitor iv,
osg::Drawable drawable 
) [virtual]

Implements osgUtil::Intersector.

virtual void osgUtil::PolytopeIntersector::leave ( ) [virtual]

Implements osgUtil::Intersector.

virtual void osgUtil::PolytopeIntersector::reset ( ) [virtual]

Reimplemented from osgUtil::Intersector.

void osgUtil::PolytopeIntersector::setDimensionMask ( unsigned int  dimensionMask) [inline]

set the dimension mask.

As polytope-triangle and polytope-quad intersections are expensive to compute it is possible to turn them off by calling setDimensionMask( DimZero | DimOne )

void osgUtil::PolytopeIntersector::setReferencePlane ( const osg::Plane plane) [inline]

set the plane used to sort the intersections.

The intersections are sorted by the distance of the localIntersectionPoint and the reference plane. The default for the reference plane is the last plane of the polytope.


Member Data Documentation

mask which dimensions should be checked

plane to use for sorting intersections


The documentation for this class was generated from the following file:

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Generated at Mon Oct 3 2011 12:39:50 for the OpenSceneGraph by doxygen 1.7.5.