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Previous code was doing N collection syncs when importing N objects
(essentially quadratic complexity in terms of object count). New
code avoids all the intermediate syncs by using
BKE_layer_collection_resync_forbid and
BKE_layer_collection_resync_allow, and then does one
BKE_main_collection_sync + BKE_main_collection_sync_remap for the
whole operation. The things done on the importer objects that are
dependent on the sync happening (marking them selected) are done in a
separate loop after the sync.
Timings: importing Moana USD scene (480k objects) on Windows, VS2022
Release build, AMD Ryzen 5950X: 12344sec -> 10979sec (saves 22 minutes).
Reviewed By: Bastien Montagne
Differential Revision: https://developer.blender.org/D15215
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Both the Alembic and USD libraries use double precision floating
point numbers internally to store time. However the Alembic I/O
code defaulted to floats even though Blender's Scene FPS, which is
generally used for look ups, is stored using a double type. Such
downcasts could lead to imprecise lookups, and would cause
compilation warnings (at least on MSVC).
This modifies the Alembic exporter and importer to make use of
doubles for the current scene time, and only downcasting to float
at the very last steps (e.g. for vertex interpolation). For the
importer, doubles are also used for computing interpolation weights,
as it is based on a time offset.
Although the USD code already used doubles internally, floats were used
at the C API level. Those were replaced as well.
Differential Revision: https://developer.blender.org/D13855
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The constant M_PI_4 is added to GLSL to ensure it works there too.
Differential Revision: https://developer.blender.org/D14288
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Added call to ensure that the USD plugins are registered
when opening a USD cache archive. This is to avoid USD
load errors due to missing USD file format plugins when
opening blender files that contain USD transform cache
constraints and mesh sequence cache modifilers.
Fixes T94396
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Use a shorter/simpler license convention, stops the header taking so
much space.
Follow the SPDX license specification: https://spdx.org/licenses
- C/C++/objc/objc++
- Python
- Shell Scripts
- CMake, GNUmakefile
While most of the source tree has been included
- `./extern/` was left out.
- `./intern/cycles` & `./intern/atomic` are also excluded because they
use different header conventions.
doc/license/SPDX-license-identifiers.txt has been added to list SPDX all
used identifiers.
See P2788 for the script that automated these edits.
Reviewed By: brecht, mont29, sergey
Ref D14069
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This is an initial implementation of a USD importer.
This work is comprised of Tangent Animation's open source USD importer,
combined with features @makowalski had implemented.
The design is very similar to the approach taken in the Alembic
importer. The core functionality resides in a collection of "reader"
classes, each of which is responsible for converting an instance of a
USD prim to the corresponding Blender Object representation.
The flow of control for the conversion can be followed in the
`import_startjob()` and `import_endjob()` functions in `usd_capi.cc`.
The `USDStageReader` class is responsible for traversing the USD stage
and instantiating the appropriate readers.
Reviewed By: sybren, HooglyBoogly
Differential Revision: https://developer.blender.org/D10700
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