O2BVHAssembly.h

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// Copyright 2019-2026 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef ALICEO2_CADSUPPORT_O2BVHASSEMBLY_
#define ALICEO2_CADSUPPORT_O2BVHASSEMBLY_
 
#include "TGeoShapeAssembly.h"
 
class TGeoVolumeAssembly;
 
namespace o2
{
namespace cad
{
 
class O2BVHAssembly : public TGeoShapeAssembly
{
 public:
  O2BVHAssembly();
  explicit O2BVHAssembly(TGeoVolumeAssembly* volume);
  ~O2BVHAssembly() override;
 
  O2BVHAssembly(const O2BVHAssembly&) = delete;
  O2BVHAssembly& operator=(const O2BVHAssembly&) = delete;
 
  void BuildBVH();
  int GetNbuilt() const { return fNbuilt; }
  size_t GetBVHMemory() const;
 
  // ---- the accelerated part of the TGeoShapeAssembly contract ----------------------------
  Bool_t Contains(const Double_t* point) const override;
  Double_t DistFromOutside(const Double_t* point, const Double_t* dir, Int_t iact = 1,
                           Double_t step = TGeoShape::Big(), Double_t* safe = nullptr) const override;
  Double_t Safety(const Double_t* point, Bool_t in = kTRUE) const override;
 
  // ---- the reference twins: same answer, all daughters, index order ----------------------
  Bool_t Contains_Loop(const Double_t* point) const;
  Double_t DistFromOutside_Loop(const Double_t* point, const Double_t* dir,
                                Double_t step = TGeoShape::Big()) const;
  Double_t Safety_Loop(const Double_t* point, Bool_t in = kTRUE) const;
 
  static O2BVHAssembly* MakeBVHAssembly(TGeoVolumeAssembly* volume);
 
 private:
  void EnsureBuilt() const;
 
  void* fBVH = nullptr; 
  int fNbuilt = -1;     
  int fTreeDepth = 0;   
 
  ClassDefOverride(O2BVHAssembly, 1) // BVH-accelerated assembly shape
};
 
} // namespace cad
} // namespace o2
 
#endif