• Beta support for Intel Xe GPUs (Intel Arc™ GPUs a Intel Data Center GPU Flex and Max Series), exploiting ray tracing hardware support. Implementation is based on the SYCL cross-platform programming language implemented by Intel oneAPI Data Parallel C++ (DPC++).
  Note that the following features are not implemented yet or are not working correctly on the new gpu device:
  • Multiple volumes in the scene
  • Clipping
  • Motion blur
  • Subdivision surfaces
  • Progress reporting via ospGetProgress or canceling the frame via ospCancel
  • Picking via ospPick
  • Adaptive accumulation via OSP_FB_VARIANCE and varianceThreshold
  • Framebuffer channels OSP_FB_ID_* (id buffers)
  • Experimental support for shared device-only data, works only for structuredRegular volume
  • Further known issues
    • Some delay on start-up or when changing the scene, because kernel code is JIT compiled and specialized. JIT compilation can be cached by setting environment variable SYCL_CACHE_PERSISTENT=1, then consecutive starts or rendering the same scene configuration is without delay
    • For some combination of compiler, GPU driver and scene the rendered images might show artifacts (e.g., vertical lines or small blocks)
    • Multidevice does not support OSPImageOperations for denoising or tone mapping
• Add implicit indexing for mesh geometry
• Add support for transferring ownership of temporary buffers: ospNewSharedData accepts an optional deleter callback
• Optimizations for MPI module, supported by new integrated performance tracing framework
• Optimize scivis gradient shading
• Main thread does not set FTZ/DAZ anymore for denormals handling
• Compute intersection epsilon for Mesh to avoid rendering artifacts due to self-intersection
• Fix energy conservation of Pricipled material under certain parameter combinations
• Fix denoiser to not wipe the alpha channel
• Fix crash in HDRI light
• Fix link order for Debug build on Windows
• The new minimum versions of dependencies:
  • Embree v4.3.0
  • Open VKL v2.0.0
  • Open Image Denoise v2.1.0
  • ISPC v1.21.1
  • rkcommon v1.12.0
• Breaking API changes
  • Renamed OSP_TEXTURE_FILTER_BILINEAR to OSP_TEXTURE_FILTER_LINEAR and OSP_VOLUME_FILTER_TRI[LINEAR|CUBIC] to OSP_VOLUME_FILTER_[LINEAR|CUBIC]
  • Most enums now use storage type uint32
  • gridSpacing of spherical regular volume defaults to full sphere
  • Remove deprecated parameters and API calls
    • error callback signatures without user pointer
    • first argument of ospNewMaterial
    • module name ispc; use cpu
    • volume texture and isosurface geometry: volumetricModel; use OSPVolume volume
    • Transfer function vec2f valueRange; use box1f value
    • hdri and sun-sky lights: intensityQuantity OSP_INTENSITY_QUANTITY_RADIANCE
    • spot light with intensityDistribution: intensityQuantity other than OSP_INTENSITY_QUANTITY_SCALE