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...
Standard_Boolean	Intersect (const OpenGl_Vec4 &theMinPt, const OpenGl_Vec4 &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 OpenGl_Mat4 &	ProjectionMatrix () const
	Returns current projection matrix. More...
const OpenGl_Mat4 &	WorldViewMatrix () const
	Returns current world view transformation matrix. More...
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_ShortReal	SignedPlanePointDistance (const OpenGl_Vec4 &theNormal, const OpenGl_Vec4 &thePnt)
	Calculates signed distance from plane to point. More...

Protected Attributes
OpenGl_Vec4	myClipPlanes [PlanesNB]
	Plane equations. More...
OpenGl_Vec4	myClipVerts [ClipVerticesNB]
	Vertices. More...
Standard_ShortReal	myMaxClipProjectionPts [PlanesNB]
	Max view volume's vertices projections onto its normals. More...
Standard_ShortReal	myMinClipProjectionPts [PlanesNB]
	Min view volume's vertices projections onto its normals. More...
Standard_ShortReal	myMaxOrthoProjectionPts [3]
	Max view volume's vertices projections onto normalized dimensions of AABB. More...
Standard_ShortReal	myMinOrthoProjectionPts [3]
	Min view volume's vertices projections onto normalized dimensions of AABB. More...
Standard_Boolean	myIsProjectionParallel
OpenGl_Mat4	myProjectionMat
OpenGl_Mat4	myWorldViewMat
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

protected

Enumerates planes of view volume.

Enumerator
Plane_Top
Plane_Bottom
Plane_Left
Plane_Right
Plane_Near
Plane_Far
PlanesNB

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

(

)

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

Member Function Documentation

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.

Standard_Boolean OpenGl_BVHTreeSelector::Intersect	(	const OpenGl_Vec4 &	theMinPt,
		const OpenGl_Vec4 &	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.

const OpenGl_Mat4& OpenGl_BVHTreeSelector::ProjectionMatrix ( ) const

inline

Returns current projection matrix.

void OpenGl_BVHTreeSelector::SetViewVolume

(

const Handle< Graphic3d_Camera > &

theCamera

)

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

Standard_ShortReal OpenGl_BVHTreeSelector::SignedPlanePointDistance ( const OpenGl_Vec4 &  theNormal, const OpenGl_Vec4 &  thePnt  )

protected

Calculates signed distance from plane to point.

Parameters

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

const OpenGl_Mat4& OpenGl_BVHTreeSelector::WorldViewMatrix ( ) const

inline

Returns current world view transformation matrix.

const Graphic3d_WorldViewProjState& OpenGl_BVHTreeSelector::WorldViewProjState ( ) const

inline

Returns state of current world view projection transformation matrices.

Field Documentation

OpenGl_Vec4 OpenGl_BVHTreeSelector::myClipPlanes[PlanesNB]

protected

Plane equations.

OpenGl_Vec4 OpenGl_BVHTreeSelector::myClipVerts[ClipVerticesNB]

protected

Vertices.

Standard_Boolean OpenGl_BVHTreeSelector::myIsProjectionParallel

protected

Standard_ShortReal OpenGl_BVHTreeSelector::myMaxClipProjectionPts[PlanesNB]

protected

Max view volume's vertices projections onto its normals.

Standard_ShortReal OpenGl_BVHTreeSelector::myMaxOrthoProjectionPts[3]

protected

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

Standard_ShortReal OpenGl_BVHTreeSelector::myMinClipProjectionPts[PlanesNB]

protected

Min view volume's vertices projections onto its normals.

Standard_ShortReal OpenGl_BVHTreeSelector::myMinOrthoProjectionPts[3]

protected

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

OpenGl_Mat4 OpenGl_BVHTreeSelector::myProjectionMat

protected

OpenGl_Mat4 OpenGl_BVHTreeSelector::myWorldViewMat

protected

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