Alembic: read/write generated coordinates of meshes

Read and write generated coordinates (also known as "original
coordinates", "reference coordinates", or "orcos") from and to Alembic.
A custom geometry property named "Pref" is used for (hopefully)
interoperability with Maya and Houdini. For now it's only guaranteed for
Blender-to-Blender.

Export: writing generated coordinates is optional (on by default).

Import: generated coordinates are always read whenever the reading of
vertex data is enabled.

Manifest Task: T88081

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/io/alembic/intern/abc_reader_mesh.cc b/source/blender/io/alembic/intern/abc_reader_mesh.cc
index 8133f615080..11b6c1c18ca 100644
--- a/source/blender/io/alembic/intern/abc_reader_mesh.cc
+++ b/source/blender/io/alembic/intern/abc_reader_mesh.cc
@@ -439,6 +439,7 @@ static void read_mesh_sample(const std::string &iobject_full_name,
 
   if ((settings->read_flag & MOD_MESHSEQ_READ_VERT) != 0) {
     read_mverts(config, abc_mesh_data);
+    read_generated_coordinates(schema.getArbGeomParams(), config, selector);
   }
 
   if ((settings->read_flag & MOD_MESHSEQ_READ_POLY) != 0) {
@@ -558,7 +559,7 @@ void AbcMeshReader::readObjectData(Main *bmain, const Alembic::Abc::ISampleSelec
     /* XXX fixme after 2.80; mesh->flag isn't copied by BKE_mesh_nomain_to_mesh() */
     /* read_mesh can be freed by BKE_mesh_nomain_to_mesh(), so get the flag before that happens. */
     short autosmooth = (read_mesh->flag & ME_AUTOSMOOTH);
-    BKE_mesh_nomain_to_mesh(read_mesh, mesh, m_object, &CD_MASK_MESH, true);
+    BKE_mesh_nomain_to_mesh(read_mesh, mesh, m_object, &CD_MASK_EVERYTHING, true);
     mesh->flag |= autosmooth;
   }
 
@@ -868,7 +869,7 @@ void AbcSubDReader::readObjectData(Main *bmain, const Alembic::Abc::ISampleSelec
 
   Mesh *read_mesh = this->read_mesh(mesh, sample_sel, MOD_MESHSEQ_READ_ALL, nullptr);
   if (read_mesh != mesh) {
-    BKE_mesh_nomain_to_mesh(read_mesh, mesh, m_object, &CD_MASK_MESH, true);
+    BKE_mesh_nomain_to_mesh(read_mesh, mesh, m_object, &CD_MASK_EVERYTHING, true);
   }
 
   ISubDSchema::Sample sample;