Blender Git Loki

Merging latest nv-usd-importer branch.

USD import: light unit conversion improvements.

Extended the logic to convert from nits to scale by the
light surface area. Also, added an option to scale the
radius of spot and local lights.

USD import: scale camera properties.

Applying scene scale to camera clipping and focus distance.

USD import: reverting scaling of light properties.

Reverting applying scaling to light size properties.

USD export: format fixes.

USD export: convert to cm option.

New option to set the USD units to centimeters and scale the
scene by 100 to convert from meters.

USD import: convert from nits on by default.

Enabling the Convert Light Units from Nits option
by default.

USD import: format fixes.

Merging latest from branch nv-usd-importer.

USD import: creater readers for untyped prims.

Added code to handle less common case where the USD prim
has no type specified (seen in some legacy USDs). We still
want to import such prims in order to access their descendents.

USD import: fix crash on missing MDL material.

Added early return in MDL conversion code if no
valid MDL is found.

USD import: light unit conversion.

Added option to convert light units from nits.

USD Import: apply scale to light size properties.

Apply the scene scale value to light radius, width
and height properties.

Merging latest usd-importer-T81257-merge branch.

USD import: z-up conversion for constraint.

Added logic to handle z-up conversion when creating
the USDStageReader handle for the transform cache
constraint.

USD import: remove Convert to Z Up option.

Removing the z-up conversion option, per suggestion
from reviewers.

USD import: root object xform logic fix.

Fixed logic for determining if a USDXformReader object
is the root of a transform hierarchy. The previous
implementation did not work for USDXformReader instances
created for transform cache contraints, since in that case
parent readers aren't set. Also, now checking if the
prim is a root xform in the USDXformReader constructor,
to avoid repeating this check every time the matrix
is computed.

USD Import: don't modify import params.

Fixed the unit conversion code to avoid changing the
import params scale member, to keep the params identical
to what the user specified. Also updated the USDXformReader
logic to use the scale value stored in the settings, to take
into account the unit scale factor.

USD Import: prune empty Scopes.

No longer instantiating readers for Scopes if
no readers are created for the Scope's descendents.

USD import: fixed typo in reader merging code.