warp.volume\_lookup\_f
======================

.. function:: warp._src.lang.volume_lookup_f(id: uint64, i: int32, j: int32, k: int32) -> float

   .. hlist::
      :columns: 8

      * Kernel
      * Python

   Query the value of voxel with coordinates ``i``, ``j``, ``k``.
   
   If the voxel at this index does not exist, this function returns the background value.