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# irr::scene::ISceneCollisionManager Class Reference

The Scene Collision Manager provides methods for performing collision tests and picking on scene nodes. More...

`#include <ISceneCollisionManager.h>`

Inheritance diagram for irr::scene::ISceneCollisionManager:

List of all members.

## Public Member Functions

virtual bool | getCollisionPoint (const core::line3d< f32 > &ray, ITriangleSelector *selector, core::vector3df &outCollisionPoint, core::triangle3df &outTriangle, const ISceneNode *&outNode)=0
| Finds the nearest collision point of a line and lots of triangles, if there is one.

virtual core::vector3df

getCollisionResultPosition (ITriangleSelector *selector, const core::vector3df &ellipsoidPosition, const core::vector3df &ellipsoidRadius, const core::vector3df &ellipsoidDirectionAndSpeed, core::triangle3df &triout, core::vector3df &hitPosition, bool &outFalling, const ISceneNode *&outNode, f32 slidingSpeed=0.0005f, const core::vector3df &gravityDirectionAndSpeed=core::vector3df(0.0f, 0.0f, 0.0f))=0

| Collides a moving ellipsoid with a 3d world with gravity and returns the resulting new position of the ellipsoid.
virtual core::line3d< f32 > | getRayFromScreenCoordinates (const core::position2d< s32 > &pos, ICameraSceneNode *camera=0)=0
| Returns a 3d ray which would go through the 2d screen coodinates.
virtual ISceneNode * | getSceneNodeAndCollisionPointFromRay (core::line3df ray, core::vector3df &outCollisionPoint, core::triangle3df &outTriangle, s32 idBitMask=0, ISceneNode *collisionRootNode=0, bool noDebugObjects=false)=0
| Perform a ray/box and ray/triangle collision check on a heirarchy of scene nodes.
virtual ISceneNode * | getSceneNodeFromCameraBB (ICameraSceneNode *camera, s32 idBitMask=0, bool bNoDebugObjects=false)=0
| Get the scene node, which the given camera is looking at and whose id matches the bitmask.
virtual ISceneNode * | getSceneNodeFromRayBB (const core::line3d< f32 > &ray, s32 idBitMask=0, bool bNoDebugObjects=false, ISceneNode *root=0)=0
| Returns the nearest scene node which collides with a 3d ray and whose id matches a bitmask.
virtual ISceneNode * | getSceneNodeFromScreenCoordinatesBB (const core::position2d< s32 > &pos, s32 idBitMask=0, bool bNoDebugObjects=false, ISceneNode *root=0)=0
| Gets the scene node, which is currently visible under the given screencoordinates, viewed from the currently active camera.
virtual core::position2d< s32 > | getScreenCoordinatesFrom3DPosition (const core::vector3df &pos, ICameraSceneNode *camera=0)=0
| Calculates 2d screen position from a 3d position.

## Detailed Description

The Scene Collision Manager provides methods for performing collision tests and picking on scene nodes.

Definition at line 24 of file ISceneCollisionManager.h.

## Member Function Documentation

virtual bool irr::scene::ISceneCollisionManager::getCollisionPoint | ( | const core::line3d< f32 > & | ray,
|  | ITriangleSelector * | selector,
|  | core::vector3df & | outCollisionPoint,
|  | core::triangle3df & | outTriangle,
|  | const ISceneNode *& | outNode |
| ) |  |  | `[pure virtual]`

Finds the nearest collision point of a line and lots of triangles, if there is one.

Parameters:

  | ray,: | Line with which collisions are tested.
  | selector,: | TriangleSelector containing the triangles. It can be created for example using ISceneManager::createTriangleSelector() or ISceneManager::createTriangleOctreeSelector().
  | outCollisionPoint,: | If a collision is detected, this will contain the position of the nearest collision to the line-start.
  | outTriangle,: | If a collision is detected, this will contain the triangle with which the ray collided.
  | outNode,: | If a collision is detected, this will contain the scene node associated with the triangle that was hit.

Returns:
  True if a collision was detected and false if not.

virtual core::vector3df irr::scene::ISceneCollisionManager::getCollisionResultPosition | ( | ITriangleSelector * | selector,
|  | const core::vector3df & | ellipsoidPosition,
|  | const core::vector3df & | ellipsoidRadius,
|  | const core::vector3df & | ellipsoidDirectionAndSpeed,
|  | core::triangle3df & | triout,
|  | core::vector3df & | hitPosition,
|  | bool & | outFalling,
|  | const ISceneNode *& | outNode,
|  | f32 | slidingSpeed = `0.0005f`,
|  | const core::vector3df & | gravityDirectionAndSpeed = `core::vector3df(0.0f, 0.0f, 0.0f)` |
| ) |  |  | `[pure virtual]`

Collides a moving ellipsoid with a 3d world with gravity and returns the resulting new position of the ellipsoid.

This can be used for moving a character in a 3d world: The character will slide at walls and is able to walk up stairs. The method used how to calculate the collision result position is based on the paper "Improved Collision detection and Response" by Kasper Fauerby.

Parameters:

  | selector,: | TriangleSelector containing the triangles of the world. It can be created for example using ISceneManager::createTriangleSelector() or ISceneManager::createTriangleOctreeSelector().
  | ellipsoidPosition,: | Position of the ellipsoid.
  | ellipsoidRadius,: | Radius of the ellipsoid.
  | ellipsoidDirectionAndSpeed,: | Direction and speed of the movement of the ellipsoid.
  | triout,: | Optional parameter where the last triangle causing a collision is stored, if there is a collision.
  | hitPosition,: | Return value for the position of the collision
  | outFalling,: | Is set to true if the ellipsoid is falling down, caused by gravity.
  | outNode,: | the node with which the ellipoid collided (if any)
  | slidingSpeed,: | DOCUMENTATION NEEDED.
  | gravityDirectionAndSpeed,: | Direction and force of gravity.

Returns:
  New position of the ellipsoid.

virtual core::line3d<f32> irr::scene::ISceneCollisionManager::getRayFromScreenCoordinates | ( | const core::position2d< s32 > & | pos,
|  | ICameraSceneNode * | camera = `0` |
| ) |  |  | `[pure virtual]`

Returns a 3d ray which would go through the 2d screen coodinates.

Parameters:

  | pos,: | Screen coordinates in pixels.
  | camera,: | Camera from which the ray starts. If null, the active camera is used.

Returns:
  Ray starting from the position of the camera and ending at a length of the far value of the camera at a position which would be behind the 2d screen coodinates.

virtual ISceneNode* irr::scene::ISceneCollisionManager::getSceneNodeAndCollisionPointFromRay | ( | core::line3df | ray,
|  | core::vector3df & | outCollisionPoint,
|  | core::triangle3df & | outTriangle,
|  | s32 | idBitMask = `0`,
|  | ISceneNode * | collisionRootNode = `0`,
|  | bool | noDebugObjects = `false` |
| ) |  |  | `[pure virtual]`

Perform a ray/box and ray/triangle collision check on a heirarchy of scene nodes.

This checks all scene nodes under the specified one, first by ray/bounding box, and then by accurate ray/triangle collision, finding the nearest collision, and the scene node containg it. It returns the node hit, and (via output parameters) the position of the collision, and the triangle that was hit.

All scene nodes in the hierarchy tree under the specified node are checked. Only nodes that are visible, with an ID that matches at least one bit in the supplied bitmask, and which have a triangle selector are considered as candidates for being hit. You do not have to build a meta triangle selector; the individual triangle selectors of each candidate scene node are used automatically.

Parameters:

  | ray,: | Line with which collisions are tested.
  | outCollisionPoint,: | If a collision is detected, this will contain the position of the nearest collision.
  | outTriangle,: | If a collision is detected, this will contain the triangle with which the ray collided.
  | idBitMask,: | Only scene nodes with an id which matches at least one of the bits contained in this mask will be tested. However, if this parameter is 0, then all nodes are checked.
  | collisionRootNode,: | the scene node at which to begin checking. Only this node and its children will be checked. If you want to check the entire scene, pass 0, and the root scene node will be used (this is the default).
  | noDebugObjects,: | when true, debug objects are not considered viable targets. Debug objects are scene nodes with IsDebugObject() = true.

Returns:
  Returns the scene node containing the hit triangle nearest to ray.start. If no collision is detected, then 0 is returned.

virtual ISceneNode* irr::scene::ISceneCollisionManager::getSceneNodeFromCameraBB | ( | ICameraSceneNode * | camera,
|  | s32 | idBitMask = `0`,
|  | bool | bNoDebugObjects = `false` |
| ) |  |  | `[pure virtual]`

Get the scene node, which the given camera is looking at and whose id matches the bitmask.

A ray is simply casted from the position of the camera to the view target position, and all scene nodes are tested against this ray. The collision tests are done using a bounding box for each scene node.

Parameters:

  | camera,: | Camera from which the ray is casted.
  | idBitMask,: | Only scene nodes with an id which matches at least one of the bits contained in this mask will be tested. However, if this parameter is 0, then all nodes are checked. feature is disabled. Please note that the default node id of -1 will match with every bitmask != 0
  | bNoDebugObjects,: | Doesn't take debug objects into account when true. These are scene nodes with IsDebugObject() = true.

Returns:
  Scene node nearest to the camera, which collides with the ray and matches the idBitMask, if the mask is not null. If no scene node is found, 0 is returned.

virtual ISceneNode* irr::scene::ISceneCollisionManager::getSceneNodeFromRayBB | ( | const core::line3d< f32 > & | ray,
|  | s32 | idBitMask = `0`,
|  | bool | bNoDebugObjects = `false`,
|  | ISceneNode * | root = `0` |
| ) |  |  | `[pure virtual]`

Returns the nearest scene node which collides with a 3d ray and whose id matches a bitmask.

The collision tests are done using a bounding box for each scene node. The recursive search can be limited be specifying a scene node.

Parameters:

  | ray | Line with which collisions are tested.
  | idBitMask | Only scene nodes with an id which matches at least one of the bits contained in this mask will be tested. However, if this parameter is 0, then all nodes are checked.
  | bNoDebugObjects,: | Doesn't take debug objects into account when true. These are scene nodes with IsDebugObject() = true.
  | root | If different from 0, the search is limited to the children of this node.

Returns:
  Scene node nearest to ray.start, which collides with the ray and matches the idBitMask, if the mask is not null. If no scene node is found, 0 is returned.

virtual ISceneNode* irr::scene::ISceneCollisionManager::getSceneNodeFromScreenCoordinatesBB | ( | const core::position2d< s32 > & | pos,
|  | s32 | idBitMask = `0`,
|  | bool | bNoDebugObjects = `false`,
|  | ISceneNode * | root = `0` |
| ) |  |  | `[pure virtual]`

Gets the scene node, which is currently visible under the given screencoordinates, viewed from the currently active camera.

The collision tests are done using a bounding box for each scene node. You can limit the recursive search so just all children of the specified root are tested.

Parameters:

  | pos,: | Position in pixel screen coordinates, under which the returned scene node will be.
  | idBitMask,: | Only scene nodes with an id with bits set like in this mask will be tested. If the BitMask is 0, this feature is disabled. Please note that the default node id of -1 will match with every bitmask != 0
  | bNoDebugObjects,: | Doesn't take debug objects into account when true. These are scene nodes with IsDebugObject() = true.
  | root | If different from 0, the search is limited to the children of this node.

Returns:
  Visible scene node under screen coordinates with matching bits in its id. If there is no scene node under this position, 0 is returned.

virtual core::position2d<s32> irr::scene::ISceneCollisionManager::getScreenCoordinatesFrom3DPosition | ( | const core::vector3df & | pos,
|  | ICameraSceneNode * | camera = `0` |
| ) |  |  | `[pure virtual]`

Calculates 2d screen position from a 3d position.

Parameters:

  | pos,: | 3D position in world space to be transformed into 2d.
  | camera,: | Camera to be used. If null, the currently active camera is used.

Returns:
  2d screen coordinates which a object in the 3d world would have if it would be rendered to the screen. If the 3d position is behind the camera, it is set to (-10000,-10000). In most cases you can ignore this fact, because if you use this method for drawing a decorator over a 3d object, it will be clipped by the screen borders.

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

- ISceneCollisionManager.h

| The Irrlicht Engine Documentation © 2003-2010 by Nikolaus Gebhardt. Generated on Sun Oct 24 12:42:07 2010 by Doxygen (1.6.2)