Blender Git Loki

ISD Import: Fixed compiler warnings.

removed second map find, formatted code

minor refactoring of conversion table names

fix for incorrect conversion map

Large refactor to use string attributes for enums instead of ints

Add documentation explaining reason for removing code

Do not set attribute values for defaultTime explicitly

Changed gradient type to proper cycles naming

Added comments for future context

Fixed variable typo

Added a bound check for vertex deform groups

Author UsdGeomBasisCurve widths as diameter instead of radius

Fixed case without a proper return value.

Cherry pick of Tangent Animation's USD Exporter.

Tangent's original commit message:
Initial open source push of internal usd export improvements.

USD Importer: dependency graph update crash.

Fixed occasional random crash due to simultaneous update
to the dependency graph from multiple threads. A typical
collision might happen when the USD import job thread
is creating a material while the window manager in the
main thread is processing event notifiers. The current
fix is to remove the ND_FRAME flag from the call to
WM_jobs_timer(), which prevents ED_update_for_newframe()
from being called from wm_event_do_notifiers().

USD import: uniform interpolation normals.

Added logic to import USD normals with uniform interpolation
(i.e., per-face normals) as Blender loop normals.

USD import: convert UsdGeomImageables only.

Currently, the importer converts every node in the USD
to a Blender Empty object by default, including nodes
that aren't of UsdGeomImageable type, such as materials
and shaders. This can unnecessarily bloat the Blender
scene with nodes that are not immediately useful. I've
added logic to restrict conversion to nodes that are
UsdGeomImageables, and this can have a dramatic effect
in some cases. For exmaple, the number of nodes imported
in the Attic scene is reduced from 1,025 to 238 with
this change.

USD import: xform cache constraint parenting bug.

USD_get_transform() was not taking the object's parent
transform into account. Now following the same logic
as in the corresponding Alembic implementation,
ABC_get_transform(), to fix this.

USD Import: Visible Prims Only flag.

Added new option to prune primitives by visibility.
If this option is enabled, invisible prims will
be excluded from the traversal. This only applies
to prims with a non-animating visibility attribute.
Prims with animating visibility will always be imported.

Apply orientation when importing USD normals.

Also added check to ensure normal and loop counts match.