...
DisplayChannels now have an optional "shadowthreshold" control that can be used to tweak shadow pass AOVs where shadows could be cut off in darker areas. The default value of 0.01 gives the same result as before and you can lower that value to make missing shadows re-appear. Warning: Setting this threshold too low may create fireflies
A new algorithm for deformation motion blurring volumes is now used by default. The advantages of the new "Eulerian" motion blur versus the previous method ("Reves") are vastly reduced preprocessing time, reduced memory consumption, and lack of (or at least greatly reduced) bias. The downsides are slightly slower convergence time, and the requirement that the velocity data exists throughout all regions of the volume along the intended path of motion. The new Attribute "volume" "int temporalmethod" can be used to revert to the previous behavior (by setting the value to 1).
- Two new volume attributes have been added to simplify the retiming of volume velocity data. Attribute "volume" "float fps" specifies an inverse scale on the velocity values computed by the PxrVolume shader, and can be used instead of the velocity multiplier on that shader. Attribute "volume" "float shutteroffset" specifies how the velocity should be applied to the volume relative to the current shutter: a value of 1 means that the volume positions are at shutter open, and the velocity is applied to move those positions to shutter close; a value of -1 means that the volume positions are at shutter close, and the velocity is applied to move those positions from shutter open.
...