Fixed several issues with joints and skinning being imported to Unreal incorrectly. Added support for material import for skeletal meshes. Added baking support for skeletal meshes.

Corrected a bug in the Texture Mask Paint tool that corrupted the display of the mask.

Fix an issue with the Curve state where pressing the T/R/E keys with the transform handle hidden would jump out of the state into a move tool. Pressing these keys now shows the handle and switches it to the desired mode when in edit mode, and consumes the key without exiting the state otherwise.

Fix issues with translating black-boxed shader HDAs to USD.

The Blendshapes 2.0 SOP now supports double precision float attributes when Cache Input Deltas is disabled.

The Blendshapes 2.0 SOP now supports double precision float attributes when Cache Input Deltas is disabled.

Fixed an issue in the POP Steer Obstacle DOP which could cause incorrect "references to nodes outside the subnet" warnings when saving an HDA containing this node.

Fixed bug in the Edit SOP where we used the world origin instead of computing a local origin for the oriented bounding box local frame in the degenerate case of a covariance matrix with a single eigenvalue.

Fixed an issue with running HQueue clones on Windows machines.

Added a new constructor for hou.AgentClip which loads a clip from a skeleton primitive on a USD stage.

Float ramps: improve the stability of editing ramps with Bezier interpolation that have many points.

Fix crash when hitting Esc key while the DeltaMush SOP is cooking in some situations.

Fixed a bug where Coordinate System LOP would use render camera's aspect ratio instead of projection camera's.

Fixed making black-boxed asset for MaterialX shader VOP HDAs.

Fixed an issue where the Unpack USD SOP did not allow enabling the Name Attribute parameter without also enabling the Path Attribute parameter.

Fixed several potential crashes with unpacking packed USD primitives, when standard attributes from the primitive's schema had an incorrect number of values (e.g. the 'velocities' attribute for point-based prims).

Fixed a bug with Gas Resize Field DOP's handling of sliced fields.

Fix a bug in the Curve state where saving during playback would revert the moved point position back to the position stored in the HUD Handle when playback was started. The state now tells the HUD to force an update during playback when points are moved to ensure it stays up to date.

Fixed a bug in the Extract Transform SOP that could cause the non-uniform scale mode to hang.

Fixed several potential crashes with unpacking packed USD primitives, when standard attributes from the primitive's schema had an incorrect number of values (e.g. the 'velocities' attribute for point-based prims).

• Fixed crash caused by previous backport of 5.4 fixes.
• Prevent potential loop if we loose the session while cooking/instanting.

Fix a bug in the Curve state with the xform handle active causing the T/R/E keys to exit the state and enter a move tool instead of switching the mode on the xform handle.