Blender Git Loki

USD Import: don't merge instance Xforms.

Fixed bug to disallow merging instance Xforms when instancing
is enabled, because this prevents instance readers from being
created for such Xforms.

USD Import: format fixes.

USD Import: unit conversion scale option.

Added Apply Unit Conversion Scale option to scale
the scene by the USD stage's meters-per-unit value,
which is applied in addition to the value specified
by the Scale option.

USD import: revert removing instancing option.

Reverting previous commit that removed instancing
functionality.

Merge branch 'usd-importer-T81257-merge' of https://gitlab-master.nvidia.com/omniverse/blender into nv-usd-importer

USD Export: spurious error message.

Calling BLI_dir_create_recursive() with a path that has a
trailing slash generates an error message that the directory
couldn't be created, even though the creation is successful.
The error message appears to be spurious, but I changed the
code to use a path with no trailing slash, to avoid this.

USD export: export UDIM textures.

Extended the texture export function to handle copying
sequnces of tiled images for UDIM textures. Also, split
the texture export code into several functions for
organization and readability.

USD exporter: null guard in create_data_writer().

Guard against dereferencing null data_writer.

USD import format fix.

USD import: remove unneeded rows in options UI.

Per suggestion from Hans Goudey in his review, removing
unnecessary instantiation of rows in the USD import options
UI layout.

USD import: enable options property split.

Per suggestion from Hans Goudey in his review, enabling
property split for import options UI.

USD import: fixed Cycles USD preview render.

Added call to update the material nodegraph when importing
USD Preview shaders, to fix issues where materials were
rendering black in Cycles.

USD Import: fixed option property description.

USD Import: fixed option property description.

USD import: format fixes.

UDS import property UI improvements.

Now hiding the Experimental section if importing
materials is disabled. Hiding the Import Material Blend
option if Import USD Preview is disabled. Import Material
Blend is now enabled by default.

USD import: incorrect file selection action.

Changed file selection action to FILE_OPENFILE.

USD import option property improvements.

Improvments to USD import option property names and tooltips,
per suggestions from Hans Goudey in his review.

USD import: use __func__ for MEM_callocN() names.

Per suggestion from Hans Goudey in his review, I replaced
hard-coded names with the __func__ macro for MED_callocN()
name arguments, to help ensure names do not become obsolete
in the future.

USD IO: removed unnecessary format change.