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Ogre::RaySceneQuery Class Reference

Specialises the SceneQuery class for querying along a ray. More...

#include <OgreSceneQuery.h>

Inheritance diagram for Ogre::RaySceneQuery:

Ogre::SceneQuery Ogre::RaySceneQueryListener Ogre::DefaultRaySceneQuery Ogre::BspRaySceneQuery Ogre::OctreeRaySceneQuery Ogre::TerrainRaySceneQuery List of all members.

Public Types

enum  WorldFragmentType {
  WFT_NONE, WFT_PLANE_BOUNDED_REGION, WFT_SINGLE_INTERSECTION, WFT_CUSTOM_GEOMETRY,
  WFT_RENDER_OPERATION
}
 This type can be used by collaborating applications & SceneManagers to agree on the type of world geometry to be returned from queries. More...


Public Member Functions

 RaySceneQuery (SceneManager *mgr)
virtual ~RaySceneQuery ()
virtual void setRay (const Ray &ray)
 Sets the ray which is to be used for this query.

virtual const Ray & getRay (void) const
 Gets the ray which is to be used for this query.

virtual void setSortByDistance (bool sort, ushort maxresults=0)
 Sets whether the results of this query will be sorted by distance along the ray.

virtual bool getSortByDistance (void) const
 Gets whether the results are sorted by distance.

virtual ushort getMaxResults (void) const
 Gets the maximum number of results returned from the query (only relevant if results are being sorted).

virtual RaySceneQueryResult & execute (void)
 Executes the query, returning the results back in one list.

virtual void execute (RaySceneQueryListener *listener)=0
 Executes the query and returns each match through a listener interface.

virtual RaySceneQueryResult & getLastResults (void) const
 Gets the results of the last query that was run using this object, provided the query was executed using the collection-returning version of execute.

virtual void clearResults (void)
 Clears the results of the last query execution.

bool queryResult (MovableObject *obj, Real distance)
 Self-callback in order to deal with execute which returns collection.

bool queryResult (SceneQuery::WorldFragment *fragment, Real distance)
 Self-callback in order to deal with execute which returns collection.

virtual void setQueryMask (unsigned long mask)
 Sets the mask for results of this query.

virtual unsigned long getQueryMask (void) const
 Returns the current mask for this query.

virtual void setWorldFragmentType (enum WorldFragmentType wft)
 Tells the query what kind of world geometry to return from queries; often the full renderable geometry is not what is needed.

virtual WorldFragmentType getWorldFragmentType (void) const
 Gets the current world fragment types to be returned from the query.

virtual const std::set< WorldFragmentType > * getSupportedWorldFragmentTypes (void) const
 Returns the types of world fragments this query supports.


Protected Attributes

Ray mRay
bool mSortByDistance
ushort mMaxResults
RaySceneQueryResult * mLastResult
SceneManager * mParentSceneMgr
unsigned long mQueryMask
std::set< WorldFragmentType > mSupportedWorldFragments
WorldFragmentType mWorldFragmentType

Detailed Description

Specialises the SceneQuery class for querying along a ray.

Definition at line 353 of file OgreSceneQuery.h.

Member Enumeration Documentation

enum Ogre::SceneQuery::WorldFragmentType [inherited]
 

This type can be used by collaborating applications & SceneManagers to agree on the type of world geometry to be returned from queries.

Not all these types will be supported by all SceneManagers; once the application has decided which SceneManager specialisation to use, it is expected that it will know which type of world geometry abstraction is available to it.

Enumeration values:
WFT_NONE  Return no world geometry hits at all.
WFT_PLANE_BOUNDED_REGION  Return pointers to convex plane-bounded regions.
WFT_SINGLE_INTERSECTION  Return a single intersection point (typically RaySceneQuery only).
WFT_CUSTOM_GEOMETRY  Custom geometry as defined by the SceneManager.
WFT_RENDER_OPERATION  General RenderOperation structure.

Definition at line 73 of file OgreSceneQuery.h.

Constructor & Destructor Documentation

Ogre::RaySceneQuery::RaySceneQuery (  SceneManager *  mgr  ) 
 

virtual Ogre::RaySceneQuery::~RaySceneQuery (   )  [virtual]
 

Member Function Documentation

virtual void Ogre::RaySceneQuery::clearResults (  void   )  [virtual]
 

Clears the results of the last query execution.

Remarks:
You only need to call this if you specifically want to free up the memory used by this object to hold the last query results. This object clears the results itself when executing and when destroying itself.

virtual void Ogre::RaySceneQuery::execute (  RaySceneQueryListener *  listener  )  [pure virtual]
 

Executes the query and returns each match through a listener interface.

Remarks:
Note that this method does not store the results of the query internally so does not update the 'last result' value. This means that this version of execute is more lightweight and therefore more efficient than the version which returns the results as a collection.

Implemented in Ogre::DefaultRaySceneQuery, Ogre::BspRaySceneQuery, Ogre::OctreeRaySceneQuery, and Ogre::TerrainRaySceneQuery.

virtual RaySceneQueryResult& Ogre::RaySceneQuery::execute (  void   )  [virtual]
 

Executes the query, returning the results back in one list.

Remarks:
This method executes the scene query as configured, gathers the results into one structure and returns a reference to that structure. These results will also persist in this query object until the next query is executed, or clearResults() is called. An more lightweight version of this method that returns results through a listener is also available.

virtual RaySceneQueryResult& Ogre::RaySceneQuery::getLastResults (  void   )  const [virtual]
 

Gets the results of the last query that was run using this object, provided the query was executed using the collection-returning version of execute.

virtual ushort Ogre::RaySceneQuery::getMaxResults (  void   )  const [virtual]
 

Gets the maximum number of results returned from the query (only relevant if results are being sorted).

virtual unsigned long Ogre::SceneQuery::getQueryMask (  void   )  const [virtual, inherited]
 

Returns the current mask for this query.

virtual const Ray& Ogre::RaySceneQuery::getRay (  void   )  const [virtual]
 

Gets the ray which is to be used for this query.

virtual bool Ogre::RaySceneQuery::getSortByDistance (  void   )  const [virtual]
 

Gets whether the results are sorted by distance.

virtual const std::set<WorldFragmentType>* Ogre::SceneQuery::getSupportedWorldFragmentTypes (  void   )  const [virtual, inherited]
 

Returns the types of world fragments this query supports.

Definition at line 152 of file OgreSceneQuery.h.

virtual WorldFragmentType Ogre::SceneQuery::getWorldFragmentType (  void   )  const [virtual, inherited]
 

Gets the current world fragment types to be returned from the query.

bool Ogre::RaySceneQuery::queryResult (  SceneQuery::WorldFragment *  fragment,
Real  distance
)  [virtual]
 

Self-callback in order to deal with execute which returns collection.

Implements Ogre::RaySceneQueryListener.

bool Ogre::RaySceneQuery::queryResult (  MovableObject *  obj,
Real  distance
)  [virtual]
 

Self-callback in order to deal with execute which returns collection.

Implements Ogre::RaySceneQueryListener.

virtual void Ogre::SceneQuery::setQueryMask (  unsigned long  mask  )  [virtual, inherited]
 

Sets the mask for results of this query.

Remarks:
This method allows you to set a 'mask' to limit the results of this query to certain types of result. The actual meaning of this value is up to the application; basically MovableObject instances will only be returned from this query if a bitwise AND operation between this mask value and the MovableObject::getQueryFlags value is non-zero. The application will have to decide what each of the bits means.

virtual void Ogre::RaySceneQuery::setRay (  const Ray &  ray  )  [virtual]
 

Sets the ray which is to be used for this query.

virtual void Ogre::RaySceneQuery::setSortByDistance (  bool  sort,
ushort  maxresults = 0
)  [virtual]
 

Sets whether the results of this query will be sorted by distance along the ray.

Remarks:
Often you want to know what was the first object a ray intersected with, and this method allows you to ask the query to sort the results so that the nearest results are listed first.
Note that because the query returns results based on bounding volumes, the ray may not actually intersect the detail of the objects returned from the query, just their bounding volumes. For this reason the caller is advised to use more detailed intersection tests on the results if a more accurate result is required; OGRE uses bounds checking in order to give the most speedy results since not all applications need extreme accuracy.
Parameters:
sort If true, results will be sorted.
maxresults If sorting is enabled, this value can be used to constrain the maximum number of results that are returned. Please note (as above) that the use of bounding volumes mean that accuracy is not guaranteed; if in doubt, allow more results and filter them in more detail. 0 means unlimited results.

virtual void Ogre::SceneQuery::setWorldFragmentType (  enum WorldFragmentType  wft  )  [virtual, inherited]
 

Tells the query what kind of world geometry to return from queries; often the full renderable geometry is not what is needed.

Remarks:
The application receiving the world geometry is expected to know what to do with it; inevitably this means that the application must have knowledge of at least some of the structures used by the custom SceneManager.
The default setting is WFT_NONE.

Member Data Documentation

RaySceneQueryResult* Ogre::RaySceneQuery::mLastResult [protected]
 

Definition at line 359 of file OgreSceneQuery.h.

ushort Ogre::RaySceneQuery::mMaxResults [protected]
 

Definition at line 358 of file OgreSceneQuery.h.

SceneManager* Ogre::SceneQuery::mParentSceneMgr [protected, inherited]
 

Definition at line 113 of file OgreSceneQuery.h.

unsigned long Ogre::SceneQuery::mQueryMask [protected, inherited]
 

Definition at line 114 of file OgreSceneQuery.h.

Ray Ogre::RaySceneQuery::mRay [protected]
 

Definition at line 356 of file OgreSceneQuery.h.

bool Ogre::RaySceneQuery::mSortByDistance [protected]
 

Definition at line 357 of file OgreSceneQuery.h.

std::set<WorldFragmentType> Ogre::SceneQuery::mSupportedWorldFragments [protected, inherited]
 

Definition at line 115 of file OgreSceneQuery.h.

WorldFragmentType Ogre::SceneQuery::mWorldFragmentType [protected, inherited]
 

Definition at line 116 of file OgreSceneQuery.h.

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

Copyright © 2000-2005 by The OGRE Team
Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Feb 12 13:03:28 2006