• Added support for temporally varying volumes with associated API changes for
  sampling, gradients, and hit iteration. This feature can be used to enable
  motion blurred rendering
• Structured regular volumes:
  • Support for temporally structured and temporally unstructured (TUV)
    input data
  • Improved nominalDeltaT for interval iteration
  • Interval iterator robustness improvements for axis-aligned rays
  • Sampling performance improvements
• VDB volumes:
  • Multi-attribute support (including three-component float grids)
  • Interval iterator robustness improvements for axis-aligned rays
  • Performance improvements for scalar sampling
  • Now restricting volumes to exactly four levels
  • Allowing leaf nodes on the lowest level only
• Unstructured volumes:
  • Improved nominalDeltaT for interval iteration
• vdb_util updates:
  • Support for loading multi-attribute .vdb files (float and Vec3s
    grids)
  • Fix order of rotation matrix coefficients loaded from .vdb files
• vklExamples additions demonstrating:
  • Motion blurred rendering on temporally structured and temporally
    unstructured volumes (structuredRegular only)
  • Support for vdb multi-attribute volumes
  • Hit iterator time support
• Superbuild updates to:
  • Embree 3.12.2
  • rkcommon 1.6.0
  • ISPC 1.15.0
  • OpenVDB 8.0.0
• Minimum rkcommon version is now 1.6.0