OSPRay v2.2.0

• Support for texture transformation in SciVis OBJ material
• Add transformations for volume textures; volume texture lookups are
  now with local object coordinates (not world coordinates anymore)
• Changed behavior: if solely a texture is given, then the default
  value of the corresponding parameter is not multiplied
• Support for better antialiasing using a set of different pixel
  filters (e.g, box, Gaussian, ...). The size of the pixel filter is
  defined by the used filter type. Previously OSPRay implicitly used a
  box filter with a size of 1, for better results the default filter
  is now OSP_PIXELFILTER_GAUSS
• Support stereo3d mode for panoramic camera
• Add new camera stereoMode OSP_STEREO_TOP_BOTTOM (with left eye
  at top half of the image)
• Added support for random light sampling to the pathtracer, the
  number of sampled light sources per path vertex is defined by the
  lightSamples parameter
• Support ring light by extending spot with innerRadius
• Fixed nonphysical behavior of the spot and sphere light sources
  • for area lights (when radius > 0) surfaces close to the light
    will be darker
  • the spot now has an angular falloff, such that a disk light is
    a proper lambertian area light, which leads to darker regions
    perpendicular to its direction (thus barely visible with a
    typically small openingAngle)
• Support for Open VKL v0.10.0 and its new sampler object API, thus
  this is now the required minimum version
• Added support for particle and VDB volumes
• Move from ospcommon to rkcommon v1.4.2
• New minimum ISPC version is 1.10.0
• Status and error callbacks now support a user pointer
• Enabled C++ wrappers (ospray_cpp) to work with non-rkcommon math
  types
  • Note that while the C API remains the same, the C++ wrappers
    will require some application updates to account for these
    changes
• Fix bug where ospGetCurrentDevice would crash if used before
  ospInit
• Allow NULL handles to be passed to ospDeviceRetain and
  ospDeviceRelease
• ISPC generated headers containing the exported functions for
  OSPRay's ISPC types and functions are now distributed with the SDK
• Add CarPaint flakeColor parameter, defaults to current Aluminium
• Fixed Debug build (which were producing different images)
• The path tracer now also regards the renderer materialist when
  creating geometry lights