message: Update MPI docs with new parameters
diff: @@ -174,6 +174,8 @@ aggregate their data to the OSPRay process for rendering.
  The model used by the distributed device takes three additional
  parameters, to allow users to express their data distribution to OSPRay.
  All models should be disjoint to ensure correct sort-last compositing.
  +Geometries used in the distributed MPI renderer can make use of the scivis
  +renderer's OBJMaterial.
  ------ ------------- ---------------------------------------------------------
  Type Name Description
  @@ -202,6 +204,9 @@ currently only supports ambient occlusion (on the local data only, with
  optional ghost data). To compute correct ambient occlusion across the
  distributed data the application is responsible for replicating ghost
  data and specifying the ghost models and models as described above.
  +Note that shadows and ambient occlusion are computed on the local geometries,
  +in the `model` and the corresponding `ghostModel` in the ghost model array,
  +if any where set.
  -------------------- ----------- -------- -----------------------------------
  Type Name Default Description
  @@ -218,8 +223,19 @@ data and specifying the ghost models and models as described above.
  ghost model shadows only its
  corresponding model
  + OSPLight[] lights [data] array with handles of the
  + [lights]
  +
  int aoSamples 0 number of rays per sample to
  compute ambient occlusion
  +
  + bool aoTransparencyEnabled false whether object transparency
  + is respected when computing
  + ambient occlusion (slower)
  +
  + bool oneSidedLighting true if true, backfacing
  + surfaces (wrt. light source)
  + receive no illumination
  -------------------- ----------- -------- -----------------------------------
  : Parameters for the `mpi_raycast` renderer.
  