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 the direction ``xyz`` from world space to the volume's index space using the linear
   part of the volume's affine transform.
   
   For positions, use :func:`~warp.volume_world_to_index` instead.
   
   :param id: The ``id`` of a :class:`warp.Volume`.
   :param xyz: Direction in world space.
   
   :returns: The transformed direction in index space with ``float32`` precision. Translation is not
             applied, and the vector is not renormalized.
   
   See :func:`~warp.volume_index_to_world` for a usage example.

.. function:: warp._src.lang.volume_world_to_index_dir(id: uint64, xyz: vec3d) -> vec3d
   :noindex:

   .. hlist::
      :columns: 8

      * Kernel
      * Python
      * Differentiable

   Transform the direction ``xyz`` from world space to the volume's index space using the linear
   part of the volume's affine transform (float64 precision).
   
   The ``float64`` overload of :func:`~warp.volume_world_to_index_dir`. Behavior and usage match
   the default ``float32`` overload; see it for details and a usage example.