Gabriele Cosmo
203 lines
7.9 KiB
C++
203 lines
7.9 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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// 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 a 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 extent uses G4Transform3D, thus takes into account
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// scaling and reflection, if any.
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// Author: Evgueni Tcherniaev (CERN), 25.05.2016 - Initial version
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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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using G4ThreeVectorList = std::vector<G4ThreeVector>;
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using G4Polygon3D = std::vector<G4Point3D>;
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using G4Segment3D = std::pair<G4Point3D,G4Point3D>;
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/**
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* @brief G4BoundingEnvelope is a helper class to facilitate calculation of
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* the extent of a solid within the limits defined by a G4VoxelLimits object.
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* Calculation of the extent takes into account scaling and reflection, if any.
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*/
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class G4BoundingEnvelope
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{
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public:
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/**
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* Constructor from an axis aligned bounding box (AABB).
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* @param[in] pMin Lower boundary point.
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* @param[in] pMax Higher boundary point.
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*/
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G4BoundingEnvelope(const G4ThreeVector& pMin,
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const G4ThreeVector& pMax);
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/**
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* Constructor from a sequence of convex polygons, the polygons should have
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* equal numbers of vertices except first and last polygons which may
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* consist of a single vertex.
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* @param[in] polygons The list of polygons.
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*/
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G4BoundingEnvelope(const std::vector<const G4ThreeVectorList*>& polygons);
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/**
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* Constructor from AABB and a sequence of polygons.
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* @param[in] pMin Lower boundary point.
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* @param[in] pMax Higher boundary point.
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* @param[in] polygons The list of polygons.
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*/
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G4BoundingEnvelope(const G4ThreeVector& pMin,
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const G4ThreeVector& pMax,
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const std::vector<const G4ThreeVectorList*>& polygons);
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/**
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* Default Destructor.
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*/
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~G4BoundingEnvelope() = default;
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/**
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* Analyses the position of the bounding box relative to the voxel.
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* It returns "true" in the case where the value of the extent can be
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* figured out directly from the dimensions of the bounding box, or
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* it is clear that the bounding box and the voxel do not intersect.
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* The reply "false" means that further calculations are needed.
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* @param[in] pAxis The axis along which compute the extent.
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* @param[in] pVoxelLimits The limiting space dictated by voxels.
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* @param[in] pTransform3D Internal transformation applied to the envelope.
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* @param[out] pMin The minimum extent value.
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* @param[out] pMax The maximum extent value.
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* @returns True if the envelope is intersected by the extent region.
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*/
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G4bool BoundingBoxVsVoxelLimits(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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/**
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* Calculates the minimum and maximum extent of the bounding envelope,
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* when under the specified transform, and within the specified limits.
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* @param[in] pAxis The axis along which compute the extent.
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* @param[in] pVoxelLimits The limiting space dictated by voxels.
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* @param[in] pTransform3D Internal transformation applied to the envelope.
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* @param[out] pMin The minimum extent value.
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* @param[out] pMax The maximum extent value.
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* @returns True if the envelope is intersected by the extent region.
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*/
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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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private:
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/**
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* Checks the correctness of the AABB (axis aligned bounding box).
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*/
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void CheckBoundingBox();
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/**
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* Checks the correctness of the sequence of convex polygonal bases.
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*/
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void CheckBoundingPolygons();
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/**
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* Finds the max scale factor of the transformation.
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*/
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G4double FindScaleFactor(const G4Transform3D& pTransform3D) const;
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/**
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* Creates a list of transformed polygons.
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*/
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void TransformVertices(const G4Transform3D& pTransform3D,
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std::vector<G4Point3D>& pVertices,
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std::vector<std::pair<G4int,G4int>>& pBases) const;
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/**
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* Finds the bounding box of a prism.
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*/
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void GetPrismAABB(const G4Polygon3D& pBaseA,
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const G4Polygon3D& pBaseB,
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G4Segment3D& pAABB) const;
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/**
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* Creates a list of edges of a prism.
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*/
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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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/**
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* Creates a list of planes bounding a prism.
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*/
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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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/**
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* Clips a set of edges by G4VoxelLimits.
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*/
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G4bool ClipEdgesByVoxel(const std::vector<G4Segment3D>& pEdges,
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const G4VoxelLimits& pLimits,
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G4Segment3D& pExtent) const;
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/**
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* Clips G4VoxelLimits by set of planes bounding a prism.
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*/
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void ClipVoxelByPlanes(G4int pBits,
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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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private:
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/** Original bounding box. */
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G4ThreeVector fMin, fMax;
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/** Reference to the original sequence of polygonal bases. */
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const std::vector<const G4ThreeVectorList*>* fPolygons = nullptr;
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};
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#endif
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