  This paper introduces a reactive navigation framework for mobile robots in
3-dimensional (3D) space. The proposed approach does not rely on the global map
information and achieves fast navigation by employing a tentacle based sampling
and their heuristic evaluations on-the-fly. This reactive nature of the
approach comes from the prior arrangement of navigation points on tentacles
(parametric contours) to sample the navigation space. These tentacles are
evaluated at each time-step, based on heuristic features such as closeness to
the goal, previous tentacle preferences and nearby obstacles in a
robot-centered 3D grid. Then, the navigable sampling point on the selected
tentacle is passed to a controller for the motion execution. The proposed
framework does not only extend its 2D tentacle-based counterparts into 3D, but
also introduces offline and online parameters, whose tuning provides
versatility and adaptability of the algorithm to work in unknown environments.
To demonstrate the superior performance of the proposed algorithm over a
state-of-art method, the statistical results from physics-based simulations on
various maps are presented. The video of the work is available at
https://youtu.be/rrF7wHCz-0M.
