Helper class that implements Hierarchical Digital Differential Analyzers for ray intersections against a generic volume.  
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template<typename TreeT, typename RayT, int ChildNodeLevel>
class openvdb::v12_0::math::VolumeHDDA< TreeT, RayT, ChildNodeLevel >
Helper class that implements Hierarchical Digital Differential Analyzers for ray intersections against a generic volume. 
The template argument ChildNodeLevel specifies the entry upper node level used for the hierarchical ray-marching. The final lowest level is always the leaf node level, i.e. not the voxel level! 
template<typename TreeT, typename RayT, int ChildNodeLevel> 
template<typename AccessorT, typename ListT> 
  
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          | void hits | ( | RayT & | ray, |  
          |  |  | AccessorT & | acc, |  
          |  |  | ListT & | times ) |  | inline | 
 
ListType is a list of RayType::TimeSpan and is required to have the two methods: clear() and push_back(). Thus, it could be std::vector<typename RayType::TimeSpan> or std::deque<typename RayType::TimeSpan>.