Gabriele Cosmo
182 lines
7.3 KiB
C++
182 lines
7.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id:$
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//
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//
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// class G4BoundingEnvelope
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//
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// Class description:
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//
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// Helper class to facilitate calculation of the extent of a solid
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// within the limits defined by the G4VoxelLimits object.
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//
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// The function CalculateExtent() of a particular solid can create
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// a G4BoundingEnvelope object that bounds the solid and then call
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// CalculateExtent() of the G4BoundingEnvelope object.
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//
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// Calculation of the extent by G4BoundingEnvelope takes into account
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// special parameter "delta" - width of an imagery layer that envelops
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// the object. This value, multiplied by max scale factor, is added
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// to the voxel limits during calculation of the extent.
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//
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// Example of use.
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// In case of G4Box, max possible distance of a point to the border
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// of the box, where the point is still considered as belonging to
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// the surface of the box, is sqrt(0.5)*kCarTolerance (see corner).
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// So, it will be safe to set the extension = kCarTolerance.
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//
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// Alternative solution can be to define G4BoundingEnvelope wide
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// enough to include the surface of the solid and set delta = 0.
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//
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// The class supports the following bouding envelopes:
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// - axis aligned bounding box (AABB);
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// - bounding prism given by two convex polygonal bases;
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// - bounding pyramid given by apex and convex polygonal base;
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// - set of bounding prisms, given by a sequence of convex
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// polygonal bases;
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// History:
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//
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// 2016.05.25 E.Tcherniaev - initial version
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//
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// --------------------------------------------------------------------
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#ifndef G4BOUNDINGENVELOPE_HH
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#define G4BOUNDINGENVELOPE_HH
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#include <vector>
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#include "geomdefs.hh"
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#include "G4ThreeVector.hh"
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#include "G4VoxelLimits.hh"
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#include "G4Transform3D.hh"
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#include "G4Point3D.hh"
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#include "G4Plane3D.hh"
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typedef std::vector<G4ThreeVector> G4ThreeVectorList;
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typedef std::vector<G4Point3D> G4Polygon3D;
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typedef std::pair<G4Point3D,G4Point3D> G4Segment3D;
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class G4BoundingEnvelope
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{
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public:
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G4BoundingEnvelope(const G4ThreeVector& pMin,
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const G4ThreeVector& pMax, G4double delta);
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// Constructor from an axis aligned bounding box (AABB)
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G4BoundingEnvelope(const G4ThreeVectorList& baseA,
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const G4ThreeVectorList& baseB, G4double delta);
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// Constructor from a prism given by two bases, the bases
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// should have equal number of vertices
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G4BoundingEnvelope(const G4ThreeVector& apex,
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const G4ThreeVectorList& base, G4double delta);
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// Constructor from a pyramid given by apex and base
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G4BoundingEnvelope(const std::vector<G4ThreeVectorList*>& polygons,
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G4double delta);
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// Constructor from a sequence of convex polygons, the polygons
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// should have equal numbers of vertices except first and last
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// polygons which may consist of a single vertex
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G4BoundingEnvelope(const G4BoundingEnvelope& rhs);
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// Copy constructor
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G4BoundingEnvelope& operator=(const G4BoundingEnvelope& rhs);
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// Assignment operator
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~G4BoundingEnvelope();
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// Destructor
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G4bool CalculateExtent(const EAxis pAxis,
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const G4VoxelLimits& pVoxelLimits,
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const G4Transform3D& pTransform3D,
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G4double& pMin, G4double& pMax) const;
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// Calculate extent of the envelope
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private:
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void SetDelta(G4double delta);
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// Set the extension
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void SetBoundingBox(const G4ThreeVector& pMin,
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const G4ThreeVector& pMax);
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// Set AABB (axis aligned bounding box)
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void SetBoundingPrism(const G4ThreeVectorList& baseA,
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const G4ThreeVectorList& baseB);
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// Set bounding prism
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void SetBoundingPyramid(const G4ThreeVector& apex,
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const G4ThreeVectorList& base);
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// Set bounding pyramid
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void SetBoundingPolygons(const std::vector<G4ThreeVectorList*>& polygons);
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// Set bounding sequence of convex polygons
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void CleanPolygons();
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// Free allocated memory
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G4VoxelLimits GetAdjustedVoxelLimits(const G4VoxelLimits& pVoxelLimits,
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G4double pDelta) const;
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// Extend voxel limits by scaled surface tolerance
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void TransformVertices(const G4Transform3D& pTransform3D,
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const G4Polygon3D& polyA,
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G4Polygon3D& polyB,
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G4Segment3D& pAABB) const;
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// Transform vertices of a polygon and update AABB (bounding box)
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void CreateListOfEdges(const G4Polygon3D& baseA,
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const G4Polygon3D& baseB,
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std::vector<G4Segment3D>& pEdges) const;
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// Create list of edges of a prism
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void CreateListOfPlanes(const G4Polygon3D& baseA,
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const G4Polygon3D& baseB,
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std::vector<G4Plane3D>& pPlanes) const;
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// Create list of planes bounding a prism
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G4bool ClipEdgesByVoxelLimits(const std::vector<G4Segment3D>& pEdges,
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const G4VoxelLimits& pLimits,
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G4Segment3D& pExtent) const;
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// Clip set of edges by G4VoxelLimits
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void ClipVoxelLimitsByPlanes(const G4VoxelLimits& pLimits,
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const std::vector<G4Plane3D>& pPlanes,
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const G4Segment3D& pAABB,
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G4Segment3D& pExtent) const;
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// Clip G4VoxelLimits by set of planes bounding a convex prism
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private:
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G4double fDelta; // extention
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std::vector<G4Polygon3D*> fBases; // sequence of polygonal bases
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};
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#endif // G4BOUNDINGENVELOPE_HH
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