/usr/include/oce/BVH_LinearBuilder.hxx is in liboce-foundation-dev 0.17.2-2.
This file is owned by root:root, with mode 0o644.
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// Created by: Danila ULYANOV
// Copyright (c) 2013-2014 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 _BVH_LinearBuilder_Header
#define _BVH_LinearBuilder_Header
#include <BVH_Builder.hxx>
typedef std::pair<Standard_Integer, Standard_Integer> BVH_EncodedLink;
//! Performs fast BVH construction using LBVH building approach.
//! Algorithm uses spatial Morton codes to reduce the BVH construction
//! problem to a sorting problem (radix sort -- O(N) complexity). This
//! Linear Bounding Volume Hierarchy (LBVH) builder produces BVH trees
//! of lower quality compared to SAH-based BVH builders but it is over
//! an order of magnitude faster (up to 3M triangles per second).
//!
//! For more details see:
//! C. Lauterbach, M. Garland, S. Sengupta, D. Luebke, and D. Manocha.
//! Fast BVH construction on GPUs. Eurographics, 2009.
template<class T, int N>
class BVH_LinearBuilder : public BVH_Builder<T, N>
{
public:
typedef typename BVH::VectorType<T, N>::Type BVH_VecNt;
public:
//! Creates binned LBVH builder.
BVH_LinearBuilder (const Standard_Integer theLeafNodeSize = 5,
const Standard_Integer theMaxTreeDepth = 32);
//! Releases resources of LBVH builder.
virtual ~BVH_LinearBuilder();
//! Builds BVH.
void Build (BVH_Set<T, N>* theSet,
BVH_Tree<T, N>* theBVH,
const BVH_Box<T, N>& theBox);
protected:
//! Emits hierarchy from sorted Morton codes.
Standard_Integer EmitHierachy (BVH_Tree<T, N>* theBVH,
const Standard_Integer theBit,
const Standard_Integer theShift,
std::vector<BVH_EncodedLink>::iterator theStart,
std::vector<BVH_EncodedLink>::iterator theFinal);
};
#include <BVH_LinearBuilder.lxx>
#endif // _BVH_LinearBuilder_Header
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