OpenGl_BVHTreeSelector Class Reference

BVHTreeSelector class provides a possibility to store parameters of view volume, such as its vertices and equations, and contains methods detecting if given AABB overlaps view volume. More...

#include <OpenGl_BVHTreeSelector.hxx>

Public Member Functions
	OpenGl_BVHTreeSelector ()
	Creates an empty selector object with parallel projection type by default. More...
void	SetViewVolume (const Handle< Graphic3d_Camera > &theCamera)
	Retrieves view volume's planes equations and its vertices from projection and world-view matrices. More...
void	SetViewportSize (const Standard_Integer theViewportWidth, const Standard_Integer theViewportHeight)
Standard_Boolean	Intersect (const OpenGl_Vec3d &theMinPt, const OpenGl_Vec3d &theMaxPt) const
	Detects if AABB overlaps view volume using separating axis theorem (SAT). More...
void	CacheClipPtsProjections ()
	Caches view volume's vertices projections along its normals and AABBs dimensions. Must be called at the beginning of each BVH tree traverse loop. More...
const Handle< Graphic3d_Camera > &	Camera () const
	Return the camera definition. More...
const OpenGl_Mat4d &	ProjectionMatrix () const
	Returns current projection matrix. More...
const OpenGl_Mat4d &	WorldViewMatrix () const
	Returns current world view transformation matrix. More...
Standard_Integer	ViewportWidth () const
Standard_Integer	ViewportHeight () const
const Graphic3d_WorldViewProjState &	WorldViewProjState () const
	Returns state of current world view projection transformation matrices. More...

Protected Types
enum	{   Plane_Top, Plane_Bottom, Plane_Left, Plane_Right,   Plane_Near, Plane_Far, PlanesNB }
	Enumerates planes of view volume. More...
enum	{   ClipVert_LeftTopNear, ClipVert_LeftBottomNear, ClipVert_RightTopNear, ClipVert_RightBottomNear,   ClipVert_LeftTopFar, ClipVert_LeftBottomFar, ClipVert_RightTopFar, ClipVert_RightBottomFar,   ClipVerticesNB }
	Enumerates vertices of view volume. More...

Protected Member Functions
Standard_Real	SignedPlanePointDistance (const OpenGl_Vec4d &theNormal, const OpenGl_Vec4d &thePnt)
	Calculates signed distance from plane to point. More...

Protected Attributes
OpenGl_Vec4d	myClipPlanes [PlanesNB]
	Plane equations. More...
OpenGl_Vec4d	myClipVerts [ClipVerticesNB]
	Vertices. More...
Handle< Graphic3d_Camera >	myCamera
	camera definition More...
Standard_Real	myMaxClipProjectionPts [PlanesNB]
	Max view volume's vertices projections onto its normals. More...
Standard_Real	myMinClipProjectionPts [PlanesNB]
	Min view volume's vertices projections onto its normals. More...
Standard_Real	myMaxOrthoProjectionPts [3]
	Max view volume's vertices projections onto normalized dimensions of AABB. More...
Standard_Real	myMinOrthoProjectionPts [3]
	Min view volume's vertices projections onto normalized dimensions of AABB. More...
Standard_Boolean	myIsProjectionParallel
OpenGl_Mat4d	myProjectionMat
OpenGl_Mat4d	myWorldViewMat
Standard_Integer	myViewportWidth
Standard_Integer	myViewportHeight
Graphic3d_WorldViewProjState	myWorldViewProjState
	State of world view projection matrices. More...

Detailed Description

BVHTreeSelector class provides a possibility to store parameters of view volume, such as its vertices and equations, and contains methods detecting if given AABB overlaps view volume.

Member Enumeration Documentation

anonymous enum

anonymous enum

protected

Enumerates planes of view volume.

Enumerator
Plane_Top
Plane_Bottom
Plane_Left
Plane_Right
Plane_Near
Plane_Far
PlanesNB

anonymous enum

anonymous enum

protected

Enumerates vertices of view volume.

Enumerator
ClipVert_LeftTopNear
ClipVert_LeftBottomNear
ClipVert_RightTopNear
ClipVert_RightBottomNear
ClipVert_LeftTopFar
ClipVert_LeftBottomFar
ClipVert_RightTopFar
ClipVert_RightBottomFar
ClipVerticesNB

Constructor & Destructor Documentation

OpenGl_BVHTreeSelector()

OpenGl_BVHTreeSelector::OpenGl_BVHTreeSelector

(

)

Creates an empty selector object with parallel projection type by default.

Member Function Documentation

CacheClipPtsProjections()

void OpenGl_BVHTreeSelector::CacheClipPtsProjections

(

)

Caches view volume's vertices projections along its normals and AABBs dimensions. Must be called at the beginning of each BVH tree traverse loop.

Camera()

const Handle< Graphic3d_Camera >& OpenGl_BVHTreeSelector::Camera ( ) const

inline

Return the camera definition.

Intersect()

Standard_Boolean OpenGl_BVHTreeSelector::Intersect	(	const OpenGl_Vec3d &	theMinPt,
		const OpenGl_Vec3d &	theMaxPt
	)		const

Detects if AABB overlaps view volume using separating axis theorem (SAT).

Parameters

theMinPt	[in] maximum point of AABB.
theMaxPt	[in] minimum point of AABB.

Returns

Standard_True, if AABB is in viewing area, Standard_False otherwise.

ProjectionMatrix()

const OpenGl_Mat4d& OpenGl_BVHTreeSelector::ProjectionMatrix ( ) const

inline

Returns current projection matrix.

SetViewportSize()

void OpenGl_BVHTreeSelector::SetViewportSize	(	const Standard_Integer	theViewportWidth,
		const Standard_Integer	theViewportHeight
	)

SetViewVolume()

void OpenGl_BVHTreeSelector::SetViewVolume

(

const Handle< Graphic3d_Camera > &

theCamera

)

Retrieves view volume's planes equations and its vertices from projection and world-view matrices.

SignedPlanePointDistance()

Standard_Real OpenGl_BVHTreeSelector::SignedPlanePointDistance ( const OpenGl_Vec4d &  theNormal, const OpenGl_Vec4d &  thePnt  )

protected

Calculates signed distance from plane to point.

Parameters

theNormal	[in] the plane's normal.
thePnt	[in]

ViewportHeight()

Standard_Integer OpenGl_BVHTreeSelector::ViewportHeight ( ) const

inline

ViewportWidth()

Standard_Integer OpenGl_BVHTreeSelector::ViewportWidth ( ) const

inline

WorldViewMatrix()

const OpenGl_Mat4d& OpenGl_BVHTreeSelector::WorldViewMatrix ( ) const

inline

Returns current world view transformation matrix.

WorldViewProjState()

const Graphic3d_WorldViewProjState& OpenGl_BVHTreeSelector::WorldViewProjState ( ) const

inline

Returns state of current world view projection transformation matrices.

Field Documentation

myCamera

Handle< Graphic3d_Camera > OpenGl_BVHTreeSelector::myCamera

protected

camera definition

myClipPlanes

OpenGl_Vec4d OpenGl_BVHTreeSelector::myClipPlanes[PlanesNB]

protected

Plane equations.

myClipVerts

OpenGl_Vec4d OpenGl_BVHTreeSelector::myClipVerts[ClipVerticesNB]

protected

Vertices.

myIsProjectionParallel

Standard_Boolean OpenGl_BVHTreeSelector::myIsProjectionParallel

protected

myMaxClipProjectionPts

Standard_Real OpenGl_BVHTreeSelector::myMaxClipProjectionPts[PlanesNB]

protected

Max view volume's vertices projections onto its normals.

myMaxOrthoProjectionPts

Standard_Real OpenGl_BVHTreeSelector::myMaxOrthoProjectionPts[3]

protected

Max view volume's vertices projections onto normalized dimensions of AABB.

myMinClipProjectionPts

Standard_Real OpenGl_BVHTreeSelector::myMinClipProjectionPts[PlanesNB]

protected

Min view volume's vertices projections onto its normals.

myMinOrthoProjectionPts

Standard_Real OpenGl_BVHTreeSelector::myMinOrthoProjectionPts[3]

protected

Min view volume's vertices projections onto normalized dimensions of AABB.

myProjectionMat

OpenGl_Mat4d OpenGl_BVHTreeSelector::myProjectionMat

protected

myViewportHeight

Standard_Integer OpenGl_BVHTreeSelector::myViewportHeight

protected

myViewportWidth

Standard_Integer OpenGl_BVHTreeSelector::myViewportWidth

protected

myWorldViewMat

OpenGl_Mat4d OpenGl_BVHTreeSelector::myWorldViewMat

protected

myWorldViewProjState

Graphic3d_WorldViewProjState OpenGl_BVHTreeSelector::myWorldViewProjState

protected

State of world view projection matrices.

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

• OpenGl_BVHTreeSelector.hxx