/usr/include/oce/OpenGl_BVHTreeSelector.hxx is in liboce-visualization-dev 0.18.2-2build1.
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// Created by: Varvara POSKONINA
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#ifndef _OpenGl_BVHTreeSelector_HeaderFile
#define _OpenGl_BVHTreeSelector_HeaderFile
#include <Graphic3d_Camera.hxx>
#include <OpenGl_Vec.hxx>
//! 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.
class OpenGl_BVHTreeSelector
{
public:
//! Creates an empty selector object with parallel projection type by default.
Standard_EXPORT OpenGl_BVHTreeSelector();
//! Retrieves view volume's planes equations and its vertices from projection and modelview matrices.
Standard_EXPORT void SetViewVolume (const Handle(Graphic3d_Camera)& theCamera);
//! Detects if AABB overlaps view volume using separating axis theorem (SAT).
//! @param theMinPt [in] maximum point of AABB.
//! @param theMaxPt [in] minimum point of AABB.
//! @return Standard_True, if AABB is in viewing area, Standard_False otherwise.
Standard_EXPORT Standard_Boolean Intersect (const OpenGl_Vec4& theMinPt,
const OpenGl_Vec4& theMaxPt) const;
//! 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_EXPORT void CacheClipPtsProjections();
//! Returnes the state of projection matrix previously saved in selector.
Standard_EXPORT const Standard_Size ProjectionState() { return myProjectionState; }
//! Returnes the link for changing the state of projection matrix.
Standard_EXPORT Standard_Size& ChangeProjectionState() { return myProjectionState; }
//! Returnes the state of model view matrix previously saved in selector.
Standard_EXPORT const Standard_Size ModelViewState() { return myModelViewState; }
//! Returnes the link for changing the state of model view matrix.
Standard_EXPORT Standard_Size& ChangeModelViewState() { return myModelViewState; }
protected:
//! Calculates signed distance from plane to point.
//! @param theNormal [in] the plane's normal.
//! @param thePnt [in]
Standard_EXPORT Standard_ShortReal SignedPlanePointDistance (const OpenGl_Vec4& theNormal,
const OpenGl_Vec4& thePnt);
protected:
//! Enumerates planes of view volume.
enum
{
Plane_Top,
Plane_Bottom,
Plane_Left,
Plane_Right,
Plane_Near,
Plane_Far,
PlanesNB
};
//! Enumerates vertices of view volume.
enum
{
ClipVert_LeftTopNear,
ClipVert_LeftBottomNear,
ClipVert_RightTopNear,
ClipVert_RightBottomNear,
ClipVert_LeftTopFar,
ClipVert_LeftBottomFar,
ClipVert_RightTopFar,
ClipVert_RightBottomFar,
ClipVerticesNB
};
protected:
OpenGl_Vec4 myClipPlanes[PlanesNB]; //!< Plane equations
OpenGl_Vec4 myClipVerts[ClipVerticesNB]; //!< Vertices
// for caching clip points projections onto viewing area normals once per traverse
// ORDER: TOP, BOTTOM, LEFT, RIGHT, NEAR, FAR
Standard_ShortReal myMaxClipProjectionPts[PlanesNB]; //!< Max view volume's vertices projections onto its normals
Standard_ShortReal myMinClipProjectionPts[PlanesNB]; //!< Min view volume's vertices projections onto its normals
// for caching clip points projections onto AABB normals once per traverse
// ORDER: E0, E1, E2
Standard_ShortReal myMaxOrthoProjectionPts[3]; //!< Max view volume's vertices projections onto normalized dimensions of AABB
Standard_ShortReal myMinOrthoProjectionPts[3]; //!< Min view volume's vertices projections onto normalized dimensions of AABB
Standard_Boolean myIsProjectionParallel;
Standard_Size myProjectionState; //! Caches the state of projection matrix to prevent unnecessary updates.
Standard_Size myModelViewState; //! Caches the state of model view matrix to prevent unnecessary updates.
};
#endif // _OpenGl_BVHTreeSelector_HeaderFile
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