Blender Git Loki

USD: nicer structure for tests/gtests/usd/CMakeLists.txt

This structure makes it easier to add new test source files, and avoids
using a temporary variable.

Merge branch 'master' into greasepencil-object

add accessor functions for inlined node tree

add clusters to inlined node tree dot export

Fix crash caused by copy pasting!

Fix FXAA alpha issue.

We just take the full RGBA color instead of packing the luma in alpha.

USD: clarified ownership of objects returned by create_xxxx_writer()

USD: renamed should_visit_duplilink() to should_visit_dupli_object()

change cluster usage in dot exporter

USD: clarification of NULL-safety of `get_object_(data_)name`

USD: explicit typedef for `ExportGraph::mapped_type`

Cleanup: Naming conventions, code clarity mentionned in review

USD: clearer explanation of when to override `get_object_data_path()`

USD: clearer explanation of when to override `get_id_name()`

USD: add `_` suffix to non-public member variables

USD: changed C++ to C comments

USD: separate typedef `DupliAndDuplicator`

USD: clarified TODO in AbstractHierarchyWriter

USD: added comment to explain 'instance'

USD: rewrapped comment (change in clang-format config?)