Fixed distributed sim tracker.py for python 3

Fixed distributed sim tracker.py for python 3

Fixed distributed sim tracker.py for python 3

Fixed distributed sim tracker.py for python 3

Updated the USD library to incorporate some Hydra optimizations for large scenes, and to fix a bug with layer flattening prims with animated asset path attributes.

Updated the USD library to incorporate some Hydra optimizations for large scenes, and to fix a bug with layer flattening prims with animated asset path attributes.

Updated the USD library to incorporate some Hydra optimizations for large scenes, and to fix a bug with layer flattening prims with animated asset path attributes.

Updated the USD library to incorporate some Hydra optimizations for large scenes, and to fix a bug with layer flattening prims with animated asset path attributes.

Fixed hou.ChannelEditorGraph.selectedKeyframes() that was returning keyframes with invalid acceleration.

Fixed hou.ChannelEditorGraph.selectedKeyframes() that was returning keyframes with invalid acceleration.

Fixed hou.ChannelEditorGraph.selectedKeyframes() that was returning keyframes with invalid acceleration.

Fixed hou.ChannelEditorGraph.selectedKeyframes() that was returning keyframes with invalid acceleration.

Fixed hou.ChannelEditorGraph.selectedKeyframes() that was returning keyframes with invalid acceleration.

Number of times the Start Here window opens and each button on Start Here window is clicked is recorded for analysis when Anonymous Usage Statistics is on.

SOP Import now supports the 'usdvisibility' attribute for packed primitives, for controlling the resulting USD prim's visibility. Previously, only the 'viewportlod' intrinsic was supported for packed prims, while all other prim types used the 'usdvisibility' attribute.

Number of times the Start Here window opens and each button on Start Here window is clicked is recorded for analysis when Anonymous Usage Statistics is on.

Number of times the Start Here window opens and each button on Start Here window is clicked is recorded for analysis when Anonymous Usage Statistics is on.

Number of times the Start Here window opens and each button on Start Here window is clicked is recorded for analysis when Anonymous Usage Statistics is on.

Number of times the Start Here window opens and each button on Start Here window is clicked is recorded for analysis when Anonymous Usage Statistics is on.

SOP Import now supports the 'usdvisibility' attribute for packed primitives, for controlling the resulting USD prim's visibility. Previously, only the 'viewportlod' intrinsic was supported for packed prims, while all other prim types used the 'usdvisibility' attribute.

SOP Import now supports the 'usdvisibility' attribute for packed primitives, for controlling the resulting USD prim's visibility. Previously, only the 'viewportlod' intrinsic was supported for packed prims, while all other prim types used the 'usdvisibility' attribute.

SOP Import now supports the 'usdvisibility' attribute for packed primitives, for controlling the resulting USD prim's visibility. Previously, only the 'viewportlod' intrinsic was supported for packed prims, while all other prim types used the 'usdvisibility' attribute.

SOP Import now supports the 'usdvisibility' attribute for packed primitives, for controlling the resulting USD prim's visibility. Previously, only the 'viewportlod' intrinsic was supported for packed prims, while all other prim types used the 'usdvisibility' attribute.

SOP Import is now significantly faster when creating indexed primvars from SOP string attributes.

Fix a crash with polyextrude with degenerate open polygons.