# Ogre::SceneQuery Class Reference

A class for performing queries on a scene. More...

`#include <OgreSceneQuery.h>`

Inheritance diagram for Ogre::SceneQuery:

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

| SceneQuery (SceneManager *mgr)
| Standard constructor, should be called by SceneManager.
virtual | ~SceneQuery ()
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

SceneManager * | mParentSceneMgr
unsigned long | mQueryMask
std::set< WorldFragmentType > | mSupportedWorldFragments
WorldFragmentType | mWorldFragmentType

## Detailed Description

A class for performing queries on a scene.

Remarks:
  This is an abstract class for performing a query on a scene, i.e. to retrieve a list of objects and/or world geometry sections which are potentially intersecting a given region. Note the use of the word 'potentially': the results of a scene query are generated based on bounding volumes, and as such are not correct at a triangle level; the user of the SceneQuery is expected to filter the results further if greater accuracy is required.

  Different SceneManagers will implement these queries in different ways to exploit their particular scene organisation, and thus will provide their own concrete subclasses. In fact, these subclasses will be derived from subclasses of this class rather than directly because there will be region-type classes in between.

  These queries could have just been implemented as methods on the SceneManager, however, they are wrapped up as objects to allow 'compilation' of queries if deemed appropriate by the implementation; i.e. each concrete subclass may precalculate information (such as fixed scene partitions involved in the query) to speed up the repeated use of the query.

  You should never try to create a SceneQuery object yourself, they should be created using the SceneManager interfaces for the type of query required, e.g. SceneManager::createSphereSceneQuery.

Definition at line 64 of file OgreSceneQuery.h.

## Member Enumeration Documentation

enum Ogre::SceneQuery::WorldFragmentType

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::SceneQuery::SceneQuery | ( | SceneManager * | mgr | ) |

| Standard constructor, should be called by SceneManager.

virtual Ogre::SceneQuery::~SceneQuery | ( |  | ) | `[virtual]`

## Member Function Documentation

virtual unsigned long Ogre::SceneQuery::getQueryMask | ( | void |  | ) | const`[virtual]`

| Returns the current mask for this query.

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

| 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]`

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

virtual void Ogre::SceneQuery::setQueryMask | ( | unsigned long | mask | ) | `[virtual]`

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::SceneQuery::setWorldFragmentType | ( | enum WorldFragmentType | wft | ) | `[virtual]`

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

SceneManager* Ogre::SceneQuery::mParentSceneMgr `[protected]`

| Definition at line 113 of file OgreSceneQuery.h.

unsigned long Ogre::SceneQuery::mQueryMask `[protected]`

| Definition at line 114 of file OgreSceneQuery.h.

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

| Definition at line 115 of file OgreSceneQuery.h.

WorldFragmentType Ogre::SceneQuery::mWorldFragmentType `[protected]`

| Definition at line 116 of file OgreSceneQuery.h.

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

- OgreSceneQuery.h

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Feb 12 13:03:22 2006