USD: add volume/VDB export

Add support for volume (OpenVDB) USD export:

- Allows to export both static and animated volumes.
- Supports volumes that have OpenVDB data from files or are generated in
  Blender with 'Mesh to Volume' modifier.
- For volumes that have generated data in Blender it also exports
  corresponding .vdb files. Those files are saved in a new folder named
  "volumes".
- Slightly changes the USD export UI panel. "Relative Texture Paths"
  becomes "Relative Paths" (and has separate UI box) as the
  functionality will now apply to both textures and volumes. Disabling
  of this option due to "Materials" checkbox being turned off has been
  removed.

Reviewed By: sybren, makowalski

Differential Revision: https://developer.blender.org/D14193

Manifest Task: T95407

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/io/alembic/exporter/abc_export_capi.cc b/source/blender/io/alembic/exporter/abc_export_capi.cc
index c1ff7df0c37..edaf53b3efa 100644
--- a/source/blender/io/alembic/exporter/abc_export_capi.cc
+++ b/source/blender/io/alembic/exporter/abc_export_capi.cc
@@ -115,7 +115,7 @@ static void export_startjob(void *customdata,
     return;
   }
 
-  ABCHierarchyIterator iter(data->depsgraph, abc_archive.get(), data->params);
+  ABCHierarchyIterator iter(data->bmain, data->depsgraph, abc_archive.get(), data->params);
 
   if (export_animation) {
     CLOG_INFO(&LOG, 2, "Exporting animation");