New:
- Arnold procedural: Ornatrix objects that generate strands are exported into the groom as hair instead of as the splines they convert to
- Arnold procedural: Surface Comb parameters are exported at the groom's sample time, so they take part in motion blur
- Arnold procedural: a warning is shown when rendering through the procedural without Remember Roots enabled in Guides From Mesh and Hair From Guides
- Rotate: added Twist Bias, concentrating the twist towards the root or the tip
- Comb brush now works in orthographic views
- Resolve Collisions is faster on animated meshes, keeping its collision scene between evaluations
- USD hair export writes point velocities and strand ids

Fixed:
- Hair geometry not updating in Arnold IPR
- Arnold strand channel names truncated to 11 characters
- Arnold Color attribute not exported automatically
- Relative procedural groom file paths resolved against the current directory instead of the exported scene's directory
- Mesh From Strands Inherit mapping producing guide mesh coordinates instead of the strands' UVs
- Stacked Frizz modifiers with an Amount ramp making animated strands jump between frames
- Edit Guides comb strokes started with no guide under the brush combing backwards when looking up at hair away from the world origin
- Edit Guides Create brush clicks moving the root of the first guide
- Edit Guides changes tracked by surface position losing their shape changes when saved
- Guides From Mesh roots changing order on a deforming mesh
- Hair below a Filter staying on the first frame of a deforming distribution mesh
- Ground Strands Attach Roots twisting guides that have a per-strand rotation
- Change Width with a texture multiplier giving zero width on hair without texture coordinates
- Resolve Collisions strands never recovering after their root was pinched or while stuck in a collision
- Clump index channel giving unclumped hairs index 0
- Graft groom without operators, such as the Empty scalp, using the whole distribution mesh as its graft surface until fitted
- USD import of animated hair files