broadphase_dynamic_AABB_tree_array.cpp

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#include "coal/broadphase/broadphase_dynamic_AABB_tree_array.h"
 
#ifdef COAL_HAVE_OCTOMAP
#include "coal/octree.h"
#endif
namespace coal {
namespace detail {
namespace dynamic_AABB_tree_array {
 
#if COAL_HAVE_OCTOMAP
 
//==============================================================================
bool collisionRecurse_(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id, const OcTree* tree2, const OcTree::OcTreeNode* root2,
    const AABB& root2_bv, const Transform3s& tf2,
    CollisionCallBackBase* callback) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root1 =
      nodes1 + root1_id;
  if (!root2) {
    if (root1->isLeaf()) {
      CollisionObject* obj1 = static_cast<CollisionObject*>(root1->data);
 
      if (!obj1->collisionGeometry()->isFree()) {
        OBB obb1, obb2;
        convertBV(root1->bv, Transform3s::Identity(), obb1);
        convertBV(root2_bv, tf2, obb2);
 
        if (obb1.overlap(obb2)) {
          Box* box = new Box();
          Transform3s box_tf;
          constructBox(root2_bv, tf2, *box, box_tf);
 
          box->cost_density = tree2->getDefaultOccupancy();
 
          CollisionObject obj2(shared_ptr<CollisionGeometry>(box), box_tf);
          return (*callback)(obj1, &obj2);
        }
      }
    } else {
      if (collisionRecurse_(nodes1, root1->children[0], tree2, nullptr,
                            root2_bv, tf2, callback))
        return true;
      if (collisionRecurse_(nodes1, root1->children[1], tree2, nullptr,
                            root2_bv, tf2, callback))
        return true;
    }
 
    return false;
  } else if (root1->isLeaf() && !tree2->nodeHasChildren(root2)) {
    CollisionObject* obj1 = static_cast<CollisionObject*>(root1->data);
    if (!tree2->isNodeFree(root2) && !obj1->collisionGeometry()->isFree()) {
      OBB obb1, obb2;
      convertBV(root1->bv, Transform3s::Identity(), obb1);
      convertBV(root2_bv, tf2, obb2);
 
      if (obb1.overlap(obb2)) {
        Box* box = new Box();
        Transform3s box_tf;
        constructBox(root2_bv, tf2, *box, box_tf);
 
        box->cost_density = root2->getOccupancy();
        box->threshold_occupied = tree2->getOccupancyThres();
 
        CollisionObject obj2(shared_ptr<CollisionGeometry>(box), box_tf);
        return (*callback)(obj1, &obj2);
      } else
        return false;
    } else
      return false;
  }
 
  OBB obb1, obb2;
  convertBV(root1->bv, Transform3s::Identity(), obb1);
  convertBV(root2_bv, tf2, obb2);
 
  if (tree2->isNodeFree(root2) || !obb1.overlap(obb2)) return false;
 
  if (!tree2->nodeHasChildren(root2) ||
      (!root1->isLeaf() && (root1->bv.size() > root2_bv.size()))) {
    if (collisionRecurse_(nodes1, root1->children[0], tree2, root2, root2_bv,
                          tf2, callback))
      return true;
    if (collisionRecurse_(nodes1, root1->children[1], tree2, root2, root2_bv,
                          tf2, callback))
      return true;
  } else {
    for (unsigned int i = 0; i < 8; ++i) {
      if (tree2->nodeChildExists(root2, i)) {
        const OcTree::OcTreeNode* child = tree2->getNodeChild(root2, i);
        AABB child_bv;
        computeChildBV(root2_bv, i, child_bv);
 
        if (collisionRecurse_(nodes1, root1_id, tree2, child, child_bv, tf2,
                              callback))
          return true;
      } else {
        AABB child_bv;
        computeChildBV(root2_bv, i, child_bv);
        if (collisionRecurse_(nodes1, root1_id, tree2, nullptr, child_bv, tf2,
                              callback))
          return true;
      }
    }
  }
 
  return false;
}
 
//==============================================================================
bool distanceRecurse_(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id, const OcTree* tree2, const OcTree::OcTreeNode* root2,
    const AABB& root2_bv, const Transform3s& tf2,
    DistanceCallBackBase* callback, CoalScalar& min_dist) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root1 =
      nodes1 + root1_id;
  if (root1->isLeaf() && !tree2->nodeHasChildren(root2)) {
    if (tree2->isNodeOccupied(root2)) {
      Box* box = new Box();
      Transform3s box_tf;
      constructBox(root2_bv, tf2, *box, box_tf);
      CollisionObject obj(shared_ptr<CollisionGeometry>(box), box_tf);
      return (*callback)(static_cast<CollisionObject*>(root1->data), &obj,
                         min_dist);
    } else
      return false;
  }
 
  if (!tree2->isNodeOccupied(root2)) return false;
 
  if (!tree2->nodeHasChildren(root2) ||
      (!root1->isLeaf() && (root1->bv.size() > root2_bv.size()))) {
    AABB aabb2;
    convertBV(root2_bv, tf2, aabb2);
 
    CoalScalar d1 = aabb2.distance((nodes1 + root1->children[0])->bv);
    CoalScalar d2 = aabb2.distance((nodes1 + root1->children[1])->bv);
 
    if (d2 < d1) {
      if (d2 < min_dist) {
        if (distanceRecurse_(nodes1, root1->children[1], tree2, root2, root2_bv,
                             tf2, callback, min_dist))
          return true;
      }
 
      if (d1 < min_dist) {
        if (distanceRecurse_(nodes1, root1->children[0], tree2, root2, root2_bv,
                             tf2, callback, min_dist))
          return true;
      }
    } else {
      if (d1 < min_dist) {
        if (distanceRecurse_(nodes1, root1->children[0], tree2, root2, root2_bv,
                             tf2, callback, min_dist))
          return true;
      }
 
      if (d2 < min_dist) {
        if (distanceRecurse_(nodes1, root1->children[1], tree2, root2, root2_bv,
                             tf2, callback, min_dist))
          return true;
      }
    }
  } else {
    for (unsigned int i = 0; i < 8; ++i) {
      if (tree2->nodeChildExists(root2, i)) {
        const OcTree::OcTreeNode* child = tree2->getNodeChild(root2, i);
        AABB child_bv;
        computeChildBV(root2_bv, i, child_bv);
 
        AABB aabb2;
        convertBV(child_bv, tf2, aabb2);
        CoalScalar d = root1->bv.distance(aabb2);
 
        if (d < min_dist) {
          if (distanceRecurse_(nodes1, root1_id, tree2, child, child_bv, tf2,
                               callback, min_dist))
            return true;
        }
      }
    }
  }
 
  return false;
}
 
#endif
 
//==============================================================================
bool collisionRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id,
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes2,
    size_t root2_id, CollisionCallBackBase* callback) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root1 =
      nodes1 + root1_id;
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root2 =
      nodes2 + root2_id;
  if (root1->isLeaf() && root2->isLeaf()) {
    if (!root1->bv.overlap(root2->bv)) return false;
    return (*callback)(static_cast<CollisionObject*>(root1->data),
                       static_cast<CollisionObject*>(root2->data));
  }
 
  if (!root1->bv.overlap(root2->bv)) return false;
 
  if (root2->isLeaf() ||
      (!root1->isLeaf() && (root1->bv.size() > root2->bv.size()))) {
    if (collisionRecurse(nodes1, root1->children[0], nodes2, root2_id,
                         callback))
      return true;
    if (collisionRecurse(nodes1, root1->children[1], nodes2, root2_id,
                         callback))
      return true;
  } else {
    if (collisionRecurse(nodes1, root1_id, nodes2, root2->children[0],
                         callback))
      return true;
    if (collisionRecurse(nodes1, root1_id, nodes2, root2->children[1],
                         callback))
      return true;
  }
  return false;
}
 
//==============================================================================
inline COAL_DLLAPI bool collisionRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes,
    size_t root_id, CollisionObject* query, CollisionCallBackBase* callback) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root = nodes + root_id;
  if (!root->bv.overlap(query->getAABB())) return false;
 
  if (root->isLeaf()) {
    return (*callback)(static_cast<CollisionObject*>(root->data), query);
  }
 
  size_t select_res = implementation_array::select(
      query->getAABB(), root->children[0], root->children[1], nodes);
 
  if (collisionRecurse(nodes, root->children[select_res], query, callback))
    return true;
 
  if (collisionRecurse(nodes, root->children[1 - select_res], query, callback))
    return true;
 
  return false;
}
 
//==============================================================================
bool selfCollisionRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes,
    size_t root_id, CollisionCallBackBase* callback) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root = nodes + root_id;
  if (root->isLeaf()) return false;
 
  if (selfCollisionRecurse(nodes, root->children[0], callback)) return true;
 
  if (selfCollisionRecurse(nodes, root->children[1], callback)) return true;
 
  if (collisionRecurse(nodes, root->children[0], nodes, root->children[1],
                       callback))
    return true;
 
  return false;
}
 
//==============================================================================
bool distanceRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id,
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes2,
    size_t root2_id, DistanceCallBackBase* callback, CoalScalar& min_dist) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root1 =
      nodes1 + root1_id;
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root2 =
      nodes2 + root2_id;
  if (root1->isLeaf() && root2->isLeaf()) {
    CollisionObject* root1_obj = static_cast<CollisionObject*>(root1->data);
    CollisionObject* root2_obj = static_cast<CollisionObject*>(root2->data);
    return (*callback)(root1_obj, root2_obj, min_dist);
  }
 
  if (root2->isLeaf() ||
      (!root1->isLeaf() && (root1->bv.size() > root2->bv.size()))) {
    CoalScalar d1 = root2->bv.distance((nodes1 + root1->children[0])->bv);
    CoalScalar d2 = root2->bv.distance((nodes1 + root1->children[1])->bv);
 
    if (d2 < d1) {
      if (d2 < min_dist) {
        if (distanceRecurse(nodes1, root1->children[1], nodes2, root2_id,
                            callback, min_dist))
          return true;
      }
 
      if (d1 < min_dist) {
        if (distanceRecurse(nodes1, root1->children[0], nodes2, root2_id,
                            callback, min_dist))
          return true;
      }
    } else {
      if (d1 < min_dist) {
        if (distanceRecurse(nodes1, root1->children[0], nodes2, root2_id,
                            callback, min_dist))
          return true;
      }
 
      if (d2 < min_dist) {
        if (distanceRecurse(nodes1, root1->children[1], nodes2, root2_id,
                            callback, min_dist))
          return true;
      }
    }
  } else {
    CoalScalar d1 = root1->bv.distance((nodes2 + root2->children[0])->bv);
    CoalScalar d2 = root1->bv.distance((nodes2 + root2->children[1])->bv);
 
    if (d2 < d1) {
      if (d2 < min_dist) {
        if (distanceRecurse(nodes1, root1_id, nodes2, root2->children[1],
                            callback, min_dist))
          return true;
      }
 
      if (d1 < min_dist) {
        if (distanceRecurse(nodes1, root1_id, nodes2, root2->children[0],
                            callback, min_dist))
          return true;
      }
    } else {
      if (d1 < min_dist) {
        if (distanceRecurse(nodes1, root1_id, nodes2, root2->children[0],
                            callback, min_dist))
          return true;
      }
 
      if (d2 < min_dist) {
        if (distanceRecurse(nodes1, root1_id, nodes2, root2->children[1],
                            callback, min_dist))
          return true;
      }
    }
  }
 
  return false;
}
 
//==============================================================================
bool distanceRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes,
    size_t root_id, CollisionObject* query, DistanceCallBackBase* callback,
    CoalScalar& min_dist) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root = nodes + root_id;
  if (root->isLeaf()) {
    CollisionObject* root_obj = static_cast<CollisionObject*>(root->data);
    return (*callback)(root_obj, query, min_dist);
  }
 
  CoalScalar d1 = query->getAABB().distance((nodes + root->children[0])->bv);
  CoalScalar d2 = query->getAABB().distance((nodes + root->children[1])->bv);
 
  if (d2 < d1) {
    if (d2 < min_dist) {
      if (distanceRecurse(nodes, root->children[1], query, callback, min_dist))
        return true;
    }
 
    if (d1 < min_dist) {
      if (distanceRecurse(nodes, root->children[0], query, callback, min_dist))
        return true;
    }
  } else {
    if (d1 < min_dist) {
      if (distanceRecurse(nodes, root->children[0], query, callback, min_dist))
        return true;
    }
 
    if (d2 < min_dist) {
      if (distanceRecurse(nodes, root->children[1], query, callback, min_dist))
        return true;
    }
  }
 
  return false;
}
 
//==============================================================================
bool selfDistanceRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes,
    size_t root_id, DistanceCallBackBase* callback, CoalScalar& min_dist) {
  DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* root = nodes + root_id;
  if (root->isLeaf()) return false;
 
  if (selfDistanceRecurse(nodes, root->children[0], callback, min_dist))
    return true;
 
  if (selfDistanceRecurse(nodes, root->children[1], callback, min_dist))
    return true;
 
  if (distanceRecurse(nodes, root->children[0], nodes, root->children[1],
                      callback, min_dist))
    return true;
 
  return false;
}
 
#if COAL_HAVE_OCTOMAP
 
//==============================================================================
bool collisionRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id, const OcTree* tree2, const OcTree::OcTreeNode* root2,
    const AABB& root2_bv, const Transform3s& tf2,
    CollisionCallBackBase* callback) {
  if (tf2.rotation().isIdentity())
    return collisionRecurse_(nodes1, root1_id, tree2, root2, root2_bv,
                             tf2.translation(), callback);
  else
    return collisionRecurse_(nodes1, root1_id, tree2, root2, root2_bv, tf2,
                             callback);
}
 
//==============================================================================
bool distanceRecurse(
    DynamicAABBTreeArrayCollisionManager::DynamicAABBNode* nodes1,
    size_t root1_id, const OcTree* tree2, const OcTree::OcTreeNode* root2,
    const AABB& root2_bv, const Transform3s& tf2,
    DistanceCallBackBase* callback, CoalScalar& min_dist) {
  if (tf2.rotation().isIdentity())
    return distanceRecurse_(nodes1, root1_id, tree2, root2, root2_bv,
                            tf2.translation(), callback, min_dist);
  else
    return distanceRecurse_(nodes1, root1_id, tree2, root2, root2_bv, tf2,
                            callback, min_dist);
}
 
#endif
 
}  // namespace dynamic_AABB_tree_array
 
}  // namespace detail
 
//==============================================================================
DynamicAABBTreeArrayCollisionManager::DynamicAABBTreeArrayCollisionManager() {
  tree_topdown_balance_threshold = &dtree.bu_threshold;
  tree_topdown_level = &dtree.topdown_level;
  max_tree_nonbalanced_level = 10;
  tree_incremental_balance_pass = 10;
  *tree_topdown_balance_threshold = 2;
  *tree_topdown_level = 0;
  tree_init_level = 0;
  setup_ = false;
 
  // from experiment, this is the optimal setting
  octree_as_geometry_collide = true;
  octree_as_geometry_distance = false;
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::registerObjects(
    const std::vector<CollisionObject*>& other_objs) {
  if (other_objs.empty()) return;
 
  if (size() > 0) {
    BroadPhaseCollisionManager::registerObjects(other_objs);
  } else {
    DynamicAABBNode* leaves = new DynamicAABBNode[other_objs.size()];
    table.rehash(other_objs.size());
    for (size_t i = 0, size = other_objs.size(); i < size; ++i) {
      leaves[i].bv = other_objs[i]->getAABB();
      leaves[i].parent = dtree.NULL_NODE;
      leaves[i].children[1] = dtree.NULL_NODE;
      leaves[i].data = other_objs[i];
      table[other_objs[i]] = i;
    }
 
    int n_leaves = (int)other_objs.size();
 
    dtree.init(leaves, n_leaves, tree_init_level);
 
    setup_ = true;
  }
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::registerObject(
    CollisionObject* obj) {
  size_t node = dtree.insert(obj->getAABB(), obj);
  table[obj] = node;
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::unregisterObject(
    CollisionObject* obj) {
  size_t node = table[obj];
  table.erase(obj);
  dtree.remove(node);
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::setup() {
  if (!setup_) {
    int num = (int)dtree.size();
    if (num == 0) {
      setup_ = true;
      return;
    }
 
    int height = (int)dtree.getMaxHeight();
 
    if ((CoalScalar)height - std::log((CoalScalar)num) / std::log(2.0) <
        max_tree_nonbalanced_level)
      dtree.balanceIncremental(tree_incremental_balance_pass);
    else
      dtree.balanceTopdown();
 
    setup_ = true;
  }
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::update() {
  for (auto it = table.cbegin(), end = table.cend(); it != end; ++it) {
    const CollisionObject* obj = it->first;
    size_t node = it->second;
    dtree.getNodes()[node].bv = obj->getAABB();
  }
 
  dtree.refit();
  setup_ = false;
 
  setup();
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::update_(
    CollisionObject* updated_obj) {
  const auto it = table.find(updated_obj);
  if (it != table.end()) {
    size_t node = it->second;
    if (!(dtree.getNodes()[node].bv == updated_obj->getAABB()))
      dtree.update(node, updated_obj->getAABB());
  }
  setup_ = false;
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::update(
    CollisionObject* updated_obj) {
  update_(updated_obj);
  setup();
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::update(
    const std::vector<CollisionObject*>& updated_objs) {
  for (size_t i = 0, size = updated_objs.size(); i < size; ++i)
    update_(updated_objs[i]);
  setup();
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::clear() {
  dtree.clear();
  table.clear();
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::getObjects(
    std::vector<CollisionObject*>& objs) const {
  objs.resize(this->size());
  std::transform(
      table.begin(), table.end(), objs.begin(),
      std::bind(&DynamicAABBTable::value_type::first, std::placeholders::_1));
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::collide(
    CollisionObject* obj, CollisionCallBackBase* callback) const {
  callback->init();
  if (size() == 0) return;
  switch (obj->collisionGeometry()->getNodeType()) {
#if COAL_HAVE_OCTOMAP
    case GEOM_OCTREE: {
      if (!octree_as_geometry_collide) {
        const OcTree* octree =
            static_cast<const OcTree*>(obj->collisionGeometryPtr());
        detail::dynamic_AABB_tree_array::collisionRecurse(
            dtree.getNodes(), dtree.getRoot(), octree, octree->getRoot(),
            octree->getRootBV(), obj->getTransform(), callback);
      } else
        detail::dynamic_AABB_tree_array::collisionRecurse(
            dtree.getNodes(), dtree.getRoot(), obj, callback);
    } break;
#endif
    default:
      detail::dynamic_AABB_tree_array::collisionRecurse(
          dtree.getNodes(), dtree.getRoot(), obj, callback);
  }
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::distance(
    CollisionObject* obj, DistanceCallBackBase* callback) const {
  callback->init();
  if (size() == 0) return;
  CoalScalar min_dist = (std::numeric_limits<CoalScalar>::max)();
  switch (obj->collisionGeometry()->getNodeType()) {
#if COAL_HAVE_OCTOMAP
    case GEOM_OCTREE: {
      if (!octree_as_geometry_distance) {
        const OcTree* octree =
            static_cast<const OcTree*>(obj->collisionGeometryPtr());
        detail::dynamic_AABB_tree_array::distanceRecurse(
            dtree.getNodes(), dtree.getRoot(), octree, octree->getRoot(),
            octree->getRootBV(), obj->getTransform(), callback, min_dist);
      } else
        detail::dynamic_AABB_tree_array::distanceRecurse(
            dtree.getNodes(), dtree.getRoot(), obj, callback, min_dist);
    } break;
#endif
    default:
      detail::dynamic_AABB_tree_array::distanceRecurse(
          dtree.getNodes(), dtree.getRoot(), obj, callback, min_dist);
  }
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::collide(
    CollisionCallBackBase* callback) const {
  callback->init();
  if (size() == 0) return;
  detail::dynamic_AABB_tree_array::selfCollisionRecurse(
      dtree.getNodes(), dtree.getRoot(), callback);
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::distance(
    DistanceCallBackBase* callback) const {
  callback->init();
  if (size() == 0) return;
  CoalScalar min_dist = (std::numeric_limits<CoalScalar>::max)();
  detail::dynamic_AABB_tree_array::selfDistanceRecurse(
      dtree.getNodes(), dtree.getRoot(), callback, min_dist);
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::collide(
    BroadPhaseCollisionManager* other_manager_,
    CollisionCallBackBase* callback) const {
  callback->init();
  DynamicAABBTreeArrayCollisionManager* other_manager =
      static_cast<DynamicAABBTreeArrayCollisionManager*>(other_manager_);
  if ((size() == 0) || (other_manager->size() == 0)) return;
  detail::dynamic_AABB_tree_array::collisionRecurse(
      dtree.getNodes(), dtree.getRoot(), other_manager->dtree.getNodes(),
      other_manager->dtree.getRoot(), callback);
}
 
//==============================================================================
void DynamicAABBTreeArrayCollisionManager::distance(
    BroadPhaseCollisionManager* other_manager_,
    DistanceCallBackBase* callback) const {
  callback->init();
  DynamicAABBTreeArrayCollisionManager* other_manager =
      static_cast<DynamicAABBTreeArrayCollisionManager*>(other_manager_);
  if ((size() == 0) || (other_manager->size() == 0)) return;
  CoalScalar min_dist = (std::numeric_limits<CoalScalar>::max)();
  detail::dynamic_AABB_tree_array::distanceRecurse(
      dtree.getNodes(), dtree.getRoot(), other_manager->dtree.getNodes(),
      other_manager->dtree.getRoot(), callback, min_dist);
}
 
//==============================================================================
bool DynamicAABBTreeArrayCollisionManager::empty() const {
  return dtree.empty();
}
 
//==============================================================================
size_t DynamicAABBTreeArrayCollisionManager::size() const {
  return dtree.size();
}
 
//==============================================================================
const detail::implementation_array::HierarchyTree<AABB>&
DynamicAABBTreeArrayCollisionManager::getTree() const {
  return dtree;
}
 
}  // namespace coal