ExtRemesher.h

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name of NVIDIA CORPORATION nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2022 NVIDIA Corporation. All rights reserved.
 
 
#ifndef EXT_REMESHER_H
#define EXT_REMESHER_H
 
#include "foundation/PxBounds3.h"
#include "foundation/PxArray.h"
 
namespace physx
{
    namespace Ext
    {
 
        // ------------------------------------------------------------------------------
 
        class Remesher {
        public:
 
            Remesher() {}
            ~Remesher() {}
 
            void remesh(const PxArray<PxVec3>& verts, const PxArray<PxU32>& triIds, PxI32 resolution = 100, PxArray<PxU32> *vertexMap = nullptr);
 
            void clear();
            void readBack(PxArray<PxVec3>& vertices, PxArray<PxU32>& triIds);
 
        private:
            PxArray<PxVec3> vertices;
            PxArray<PxI32> triIds;
 
            void addCell(PxI32 xi, PxI32 yi, PxI32 zi);
            PxI32  getCellNr(PxI32 xi, PxI32 yi, PxI32 zi) const;
            bool cellExists(PxI32 xi, PxI32 yi, PxI32 zi) const;
 
            void removeDuplicateVertices();
            void pruneInternalSurfaces();
            void computeNormals();
            void findTriNeighbors();
 
            void project(const PxArray<PxVec3>& inputVerts, const PxArray<PxU32>& inputTriIds,
                float searchDist, float surfaceDist);
 
            void createVertexMap(const PxArray<PxVec3>& inputVerts, const PxVec3 &gridOrigin, PxF32 &gridSpacing,
                PxArray<PxU32> &vertexMap);
 
            // -------------------------------------------------------------------------------------
            struct Cell
            {
                void init(PxI32 _xi, PxI32 _yi, PxI32 _zi) {
                    this->xi = _xi; this->yi = _yi; this->zi = _zi;
                    this->next = -1;
                }
                PxI32 xi, yi, zi;
                PxI32 next;
            };
 
            PxArray<Cell> cells;
            PxArray<PxI32> firstCell;
            PxArray<PxVec3> normals;
            PxArray<PxI32> triNeighbors;
            PxArray<PxI32> cellOfVertex;
 
            PxArray<PxBounds3> bvhBounds;
            PxArray<PxI32> bvhTris;
        };
    }
}
 
 
#endif