/usr/include/oce/SelectMgr_Frustum.hxx is in liboce-visualization-dev 0.18.2-2build1.
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// Created by: Varvara POSKONINA
// Copyright (c) 2005-2014 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 _SelectMgr_Frustum_HeaderFile
#define _SelectMgr_Frustum_HeaderFile
#include <BVH_Box.hxx>
#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <gp_XYZ.hxx>
#include <SelectMgr_BaseFrustum.hxx>
#include <TColgp_HArray1OfPnt.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
//! This is an internal class containing representation of rectangular selecting frustum, created in case
//! of point and box selection, and algorithms for overlap detection between selecting
//! frustum and sensitive entities. The principle of frustum calculation:
//! - for point selection: on a near view frustum plane rectangular neighborhood of
//! user-picked point is created according to the pixel tolerance
//! given and then this rectangle is projected onto far view frustum
//! plane. This rectangles define the parallel bases of selecting frustum;
//! - for box selection: box points are projected onto near and far view frustum planes.
//! These 2 projected rectangles define parallel bases of selecting frustum.
//! Overlap detection tests are implemented according to the terms of separating axis
//! theorem (SAT).
//! Vertex order:
//! - for triangular frustum: V0_Near, V1_Near, V2_Near,
//! V0_Far, V1_Far, V2_Far;
//! - for rectangular frustum: LeftTopNear, LeftTopFar,
//! LeftBottomNear,LeftBottomFar,
//! RightTopNear, RightTopFar,
//! RightBottomNear, RightBottomFar.
//! Plane order in array:
//! - for triangular frustum: V0V1, V1V2, V0V2, Near, Far;
//! - for rectangular frustum: Top, Bottom, Left, Right, Near, Far.
//! Uncollinear edge directions order:
//! - for rectangular frustum: Horizontal, Vertical,
//! LeftLower, RightLower,
//! LeftUpper, RightUpper;
//! - for triangular frustum: V0_Near - V0_Far, V1_Near - V1_Far, V2_Near - V2_Far,
//! V1_Near - V0_Near, V2_Near - V1_Near, V2_Near - V0_Near.
template <int N>
class SelectMgr_Frustum : public SelectMgr_BaseFrustum
{
public:
SelectMgr_Frustum() : SelectMgr_BaseFrustum() {};
protected:
// SAT Tests for different objects
//! Returns true if selecting volume is overlapped by axis-aligned bounding box
//! with minimum corner at point theMinPt and maximum at point theMaxPt
Standard_Boolean hasOverlap (const SelectMgr_Vec3& theBoxMin,
const SelectMgr_Vec3& theBoxMax,
Standard_Boolean* theInside = NULL);
//! SAT intersection test between defined volume and given point
Standard_Boolean hasOverlap (const gp_Pnt& thePnt);
//! SAT intersection test between defined volume and given segment
Standard_Boolean hasOverlap (const gp_Pnt& thePnt1,
const gp_Pnt& thePnt2);
//! SAT intersection test between frustum given and planar convex polygon represented as ordered point set
Standard_Boolean hasOverlap (const Handle(TColgp_HArray1OfPnt)& theArrayOfPnts,
gp_Vec& theNormal);
//! SAT intersection test between defined volume and given triangle
Standard_Boolean hasOverlap (const gp_Pnt& thePnt1,
const gp_Pnt& thePnt2,
const gp_Pnt& thePnt3,
gp_Vec& theNormal);
private:
//! Checks if AABB and frustum are separated along the given axis
Standard_Boolean isSeparated (const SelectMgr_Vec3& theBoxMin,
const SelectMgr_Vec3& theBoxMax,
const gp_XYZ& theDirect,
Standard_Boolean* theInside) const;
//! Checks if triangle and frustum are separated along the given axis
Standard_Boolean isSeparated (const gp_Pnt& thePnt1,
const gp_Pnt& thePnt2,
const gp_Pnt& thePnt3,
const gp_XYZ& theAxis) const;
protected:
gp_Vec myPlanes[N + 2]; //!< Plane equations
gp_Pnt myVertices[N * 2]; //!< Vertices coordinates
Standard_Real myMaxVertsProjections[N + 2]; //!< Cached projections of vertices onto frustum plane directions
Standard_Real myMinVertsProjections[N + 2]; //!< Cached projections of vertices onto frustum plane directions
Standard_Real myMaxOrthoVertsProjections[3]; //!< Cached projections of vertices onto directions of ortho unit vectors
Standard_Real myMinOrthoVertsProjections[3]; //!< Cached projections of vertices onto directions of ortho unit vectors
gp_Vec myEdgeDirs[6]; //!< Cached edge directions
};
#include <SelectMgr_Frustum.lxx>
#endif // _SelectMgr_Frustum_HeaderFile
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