warp.volume\_world\_to\_index\_dir
==================================

.. function:: warp._src.lang.volume_world_to_index_dir(id: uint64, xyz: vec3f) -> vec3f

   .. hlist::
      :columns: 8

      * Kernel
      * Python
      * Differentiable

   Transform a direction ``xyz`` defined in volume world space to the volume's index space given the volume's intrinsic affine transformation.