BVH_model.h

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#ifndef COAL_BVH_MODEL_H
#define COAL_BVH_MODEL_H
 
#include "coal/fwd.hh"
#include "coal/collision_object.h"
#include "coal/BVH/BVH_internal.h"
#include "coal/BV/BV_node.h"
 
#include <vector>
#include <memory>
#include <iostream>
 
namespace coal {
 
 
class ConvexBase;
 
template <typename BV>
class BVFitter;
template <typename BV>
class BVSplitter;
 
class COAL_DLLAPI BVHModelBase : public CollisionGeometry {
 public:
  std::shared_ptr<std::vector<Vec3s>> vertices;
 
  std::shared_ptr<std::vector<Triangle>> tri_indices;
 
  std::shared_ptr<std::vector<Vec3s>> prev_vertices;
 
  unsigned int num_tris;
 
  unsigned int num_vertices;
 
  BVHBuildState build_state;
 
  shared_ptr<ConvexBase> convex;
 
  BVHModelType getModelType() const {
    if (num_tris && num_vertices)
      return BVH_MODEL_TRIANGLES;
    else if (num_vertices)
      return BVH_MODEL_POINTCLOUD;
    else
      return BVH_MODEL_UNKNOWN;
  }
 
  BVHModelBase();
 
  BVHModelBase(const BVHModelBase& other);
 
  virtual ~BVHModelBase() {}
 
  OBJECT_TYPE getObjectType() const { return OT_BVH; }
 
  void computeLocalAABB();
 
  int beginModel(unsigned int num_tris = 0, unsigned int num_vertices = 0);
 
  int addVertex(const Vec3s& p);
 
  int addVertices(const MatrixX3s& points);
 
  int addTriangles(const Matrixx3i& triangles);
 
  int addTriangle(const Vec3s& p1, const Vec3s& p2, const Vec3s& p3);
 
  int addSubModel(const std::vector<Vec3s>& ps,
                  const std::vector<Triangle>& ts);
 
  int addSubModel(const std::vector<Vec3s>& ps);
 
  int endModel();
 
  int beginReplaceModel();
 
  int replaceVertex(const Vec3s& p);
 
  int replaceTriangle(const Vec3s& p1, const Vec3s& p2, const Vec3s& p3);
 
  int replaceSubModel(const std::vector<Vec3s>& ps);
 
  int endReplaceModel(bool refit = true, bool bottomup = true);
 
  int beginUpdateModel();
 
  int updateVertex(const Vec3s& p);
 
  int updateTriangle(const Vec3s& p1, const Vec3s& p2, const Vec3s& p3);
 
  int updateSubModel(const std::vector<Vec3s>& ps);
 
  int endUpdateModel(bool refit = true, bool bottomup = true);
 
  void buildConvexRepresentation(bool share_memory);
 
  bool buildConvexHull(bool keepTriangle, const char* qhullCommand = NULL);
 
  virtual int memUsage(const bool msg = false) const = 0;
 
  virtual void makeParentRelative() = 0;
 
  Vec3s computeCOM() const {
    CoalScalar vol = 0;
    Vec3s com(0, 0, 0);
    if (!(vertices.get())) {
      std::cerr << "BVH Error in `computeCOM`! The BVHModel does not contain "
                   "vertices."
                << std::endl;
      return com;
    }
    const std::vector<Vec3s>& vertices_ = *vertices;
    if (!(tri_indices.get())) {
      std::cerr << "BVH Error in `computeCOM`! The BVHModel does not contain "
                   "triangles."
                << std::endl;
      return com;
    }
    const std::vector<Triangle>& tri_indices_ = *tri_indices;
 
    for (unsigned int i = 0; i < num_tris; ++i) {
      const Triangle& tri = tri_indices_[i];
      CoalScalar d_six_vol =
          (vertices_[tri[0]].cross(vertices_[tri[1]])).dot(vertices_[tri[2]]);
      vol += d_six_vol;
      com += (vertices_[tri[0]] + vertices_[tri[1]] + vertices_[tri[2]]) *
             d_six_vol;
    }
 
    return com / (vol * 4);
  }
 
  CoalScalar computeVolume() const {
    CoalScalar vol = 0;
    if (!(vertices.get())) {
      std::cerr << "BVH Error in `computeCOM`! The BVHModel does not contain "
                   "vertices."
                << std::endl;
      return vol;
    }
    const std::vector<Vec3s>& vertices_ = *vertices;
    if (!(tri_indices.get())) {
      std::cerr << "BVH Error in `computeCOM`! The BVHModel does not contain "
                   "triangles."
                << std::endl;
      return vol;
    }
    const std::vector<Triangle>& tri_indices_ = *tri_indices;
    for (unsigned int i = 0; i < num_tris; ++i) {
      const Triangle& tri = tri_indices_[i];
      CoalScalar d_six_vol =
          (vertices_[tri[0]].cross(vertices_[tri[1]])).dot(vertices_[tri[2]]);
      vol += d_six_vol;
    }
 
    return vol / 6;
  }
 
  Matrix3s computeMomentofInertia() const {
    Matrix3s C = Matrix3s::Zero();
 
    Matrix3s C_canonical;
    C_canonical << 1 / 60.0, 1 / 120.0, 1 / 120.0, 1 / 120.0, 1 / 60.0,
        1 / 120.0, 1 / 120.0, 1 / 120.0, 1 / 60.0;
 
    if (!(vertices.get())) {
      std::cerr << "BVH Error in `computeMomentofInertia`! The BVHModel does "
                   "not contain vertices."
                << std::endl;
      return C;
    }
    const std::vector<Vec3s>& vertices_ = *vertices;
    if (!(vertices.get())) {
      std::cerr << "BVH Error in `computeMomentofInertia`! The BVHModel does "
                   "not contain vertices."
                << std::endl;
      return C;
    }
    const std::vector<Triangle>& tri_indices_ = *tri_indices;
    for (unsigned int i = 0; i < num_tris; ++i) {
      const Triangle& tri = tri_indices_[i];
      const Vec3s& v1 = vertices_[tri[0]];
      const Vec3s& v2 = vertices_[tri[1]];
      const Vec3s& v3 = vertices_[tri[2]];
      Matrix3s A;
      A << v1.transpose(), v2.transpose(), v3.transpose();
      C += A.derived().transpose() * C_canonical * A * (v1.cross(v2)).dot(v3);
    }
 
    return C.trace() * Matrix3s::Identity() - C;
  }
 
 protected:
  virtual void deleteBVs() = 0;
  virtual bool allocateBVs() = 0;
 
  virtual int buildTree() = 0;
 
  virtual int refitTree(bool bottomup) = 0;
 
  unsigned int num_tris_allocated;
  unsigned int num_vertices_allocated;
  unsigned int num_vertex_updated;  
 
 protected:
  virtual bool isEqual(const CollisionGeometry& other) const;
};
 
template <typename BV>
class COAL_DLLAPI BVHModel : public BVHModelBase {
  typedef BVHModelBase Base;
 
 public:
  using bv_node_vector_t =
      std::vector<BVNode<BV>, Eigen::aligned_allocator<BVNode<BV>>>;
 
  shared_ptr<BVSplitter<BV>> bv_splitter;
 
  shared_ptr<BVFitter<BV>> bv_fitter;
 
  BVHModel();
 
  BVHModel(const BVHModel& other);
 
  virtual BVHModel<BV>* clone() const { return new BVHModel(*this); }
 
  ~BVHModel() {}
 
 
  const BVNode<BV>& getBV(unsigned int i) const {
    assert(i < num_bvs);
    return (*bvs)[i];
  }
 
  BVNode<BV>& getBV(unsigned int i) {
    assert(i < num_bvs);
    return (*bvs)[i];
  }
 
  unsigned int getNumBVs() const { return num_bvs; }
 
  NODE_TYPE getNodeType() const { return BV_UNKNOWN; }
 
  int memUsage(const bool msg) const;
 
  void makeParentRelative() {
    Matrix3s I(Matrix3s::Identity());
    makeParentRelativeRecurse(0, I, Vec3s::Zero());
  }
 
 protected:
  void deleteBVs();
  bool allocateBVs();
 
  unsigned int num_bvs_allocated;
  std::shared_ptr<std::vector<unsigned int>> primitive_indices;
 
  std::shared_ptr<bv_node_vector_t> bvs;
 
  unsigned int num_bvs;
 
  int buildTree();
 
  int refitTree(bool bottomup);
 
  int refitTree_topdown();
 
  int refitTree_bottomup();
 
  int recursiveBuildTree(int bv_id, unsigned int first_primitive,
                         unsigned int num_primitives);
 
  int recursiveRefitTree_bottomup(int bv_id);
 
  void makeParentRelativeRecurse(int bv_id, Matrix3s& parent_axes,
                                 const Vec3s& parent_c) {
    bv_node_vector_t& bvs_ = *bvs;
    if (!bvs_[static_cast<size_t>(bv_id)].isLeaf()) {
      makeParentRelativeRecurse(bvs_[static_cast<size_t>(bv_id)].first_child,
                                parent_axes,
                                bvs_[static_cast<size_t>(bv_id)].getCenter());
 
      makeParentRelativeRecurse(
          bvs_[static_cast<size_t>(bv_id)].first_child + 1, parent_axes,
          bvs_[static_cast<size_t>(bv_id)].getCenter());
    }
 
    bvs_[static_cast<size_t>(bv_id)].bv =
        translate(bvs_[static_cast<size_t>(bv_id)].bv, -parent_c);
  }
 
 private:
  virtual bool isEqual(const CollisionGeometry& _other) const {
    const BVHModel* other_ptr = dynamic_cast<const BVHModel*>(&_other);
    if (other_ptr == nullptr) return false;
    const BVHModel& other = *other_ptr;
 
    bool res = Base::isEqual(other);
    if (!res) return false;
 
    // unsigned int other_num_primitives = 0;
    // if(other.primitive_indices)
    // {
 
    //   switch(other.getModelType())
    //   {
    //     case BVH_MODEL_TRIANGLES:
    //       other_num_primitives = num_tris;
    //       break;
    //     case BVH_MODEL_POINTCLOUD:
    //       other_num_primitives = num_vertices;
    //       break;
    //     default:
    //       ;
    //   }
    // }
 
    //    unsigned int num_primitives = 0;
    //    if(primitive_indices)
    //    {
    //
    //      switch(other.getModelType())
    //      {
    //        case BVH_MODEL_TRIANGLES:
    //          num_primitives = num_tris;
    //          break;
    //        case BVH_MODEL_POINTCLOUD:
    //          num_primitives = num_vertices;
    //          break;
    //        default:
    //          ;
    //      }
    //    }
    //
    //    if(num_primitives != other_num_primitives)
    //      return false;
    //
    //    for(int k = 0; k < num_primitives; ++k)
    //    {
    //      if(primitive_indices[k] != other.primitive_indices[k])
    //        return false;
    //    }
 
    if (num_bvs != other.num_bvs) return false;
 
    if ((!(bvs.get()) && other.bvs.get()) || (bvs.get() && !(other.bvs.get())))
      return false;
    if (bvs.get() && other.bvs.get()) {
      const bv_node_vector_t& bvs_ = *bvs;
      const bv_node_vector_t& other_bvs_ = *(other.bvs);
      for (unsigned int k = 0; k < num_bvs; ++k) {
        if (bvs_[k] != other_bvs_[k]) return false;
      }
    }
 
    return true;
  }
};
 
 
template <>
void BVHModel<OBB>::makeParentRelativeRecurse(int bv_id, Matrix3s& parent_axes,
                                              const Vec3s& parent_c);
 
template <>
void BVHModel<RSS>::makeParentRelativeRecurse(int bv_id, Matrix3s& parent_axes,
                                              const Vec3s& parent_c);
 
template <>
void BVHModel<OBBRSS>::makeParentRelativeRecurse(int bv_id,
                                                 Matrix3s& parent_axes,
                                                 const Vec3s& parent_c);
 
template <>
NODE_TYPE BVHModel<AABB>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<OBB>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<RSS>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<kIOS>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<OBBRSS>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<KDOP<16>>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<KDOP<18>>::getNodeType() const;
 
template <>
NODE_TYPE BVHModel<KDOP<24>>::getNodeType() const;
 
}  // namespace coal
 
#endif