OSPRay v2.6.0

• Added new intensityQuantity type OSP_INTENSITY_QUANTITY_SCALE
  for the hdri and sunSky light source. For the future this is the
  only supported quantity for these lights, the value
  OSP_INTENSITY_QUANTITY_RADIANCE is deprecated. When
  OSP_INTENSITY_QUANTITY_SCALE is used for sunSky the default
  value of intensity is 0.025 to match the old behaviour
• The MPI module is included in the releases packages. An
  MPICH-ABI compatible build is provided
  for Linux that can be run with the Intel oneAPI HPC Toolki, MPICH,
  and other MPICH-ABI compatible MPI distributions. The Windows
  release is built against MPI provided in the Intel oneAPI HPC
  Toolkit
• OSPRay now requires minimum Open VKL v0.13.0 to bring the
  following improvements:
  • Support half precision float (fp16) voxel data in strutured
    volumes (regular and spherical) and VDB volume
  • Supporting tricubic filtering via VKL_FILTER_TRICUBIC filter
    for VDB volume
  • Fixed artifacts for isosurfaces of unstructured volumes
  • Performance improvements for isosurfaces when multiple
    isovalues are selected
  • Better, adaptive sampling of AMR volumes
• The mpiOffload and mpiDistributed devices now support picking.
  Picking in the distributed device will return the globally closest
  object on the rank that owns that object. Other ranks will report
  no hit
• Messages issued from ISPC code use the same reporting path as the C++
  code, thus now the whole OSPRay console output can be consistently
  filtered with log levels
• Open VKL and Embree internal errors are now correctly mapped to
  their corresponding OSPRay errors
• Fix behavior of committing the framebuffer in distributed rendering
  to match that of local rendering