warp.volume\_sample\_grad\_f
============================

.. function:: warp._src.lang.volume_sample_grad_f(id: uint64, uvw: vec3f, sampling_mode: int32, grad: vec3f) -> float

   .. hlist::
      :columns: 8

      * Kernel
      * Python
      * Differentiable

   Sample the :class:`warp.float32` volume given by ``id`` and its gradient at the
   index-space point ``uvw``.
   
   ``grad`` receives the gradient of the sampled value with respect to the index-space coordinates
   ``uvw`` (a :class:`warp.vec3`, zero for :attr:`warp.Volume.CLOSEST`). In kernels,
   ``volume_sample_grad_f()`` is equivalent to :func:`~warp.volume_sample_grad` with ``dtype=float``.
   
   :returns: The sampled :class:`warp.float32` value.
   
   See :func:`~warp.volume_sample_grad` for a usage example.