Basic Alembic support

All in all, this patch adds an Alembic importer, an Alembic exporter,
and a new CacheFile data block which, for now, wraps around an Alembic
archive. This data block is made available through a new modifier ("Mesh
Sequence Cache") as well as a new constraint ("Transform Cache") to
somewhat properly support respectively geometric and transformation data
streaming from alembic caches.

A more in-depth documentation is to be found on the wiki, as well as a
 guide to compile alembic: https://wiki.blender.org/index.php/
User:Kevindietrich/AlembicBasicIo.

Many thanks to everyone involved in this little project, and huge shout
out to "cgstrive" for the thorough testings with Maya, 3ds Max, Houdini
and Realflow as well as @fjuhec, @jensverwiebe and @jasperge for the
custom builds and compile fixes.

Reviewers: sergey, campbellbarton, mont29

Reviewed By: sergey, campbellbarton, mont29

Differential Revision: https://developer.blender.org/D2060

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/bpath.c b/source/blender/blenkernel/intern/bpath.c
index a708c59fa97..487b8ffa2b5 100644
--- a/source/blender/blenkernel/intern/bpath.c
+++ b/source/blender/blenkernel/intern/bpath.c
@@ -48,6 +48,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "DNA_brush_types.h"
+#include "DNA_cachefile_types.h"
 #include "DNA_image_types.h"
 #include "DNA_mesh_types.h"
 #include "DNA_modifier_types.h"
@@ -653,6 +654,12 @@ void BKE_bpath_traverse_id(Main *bmain, ID *id, BPathVisitor visit_cb, const int
 			rewrite_path_fixed(clip->name, visit_cb, absbase, bpath_user_data);
 			break;
 		}
+		case ID_CF:
+		{
+			CacheFile *cache_file = (CacheFile *)id;
+			rewrite_path_fixed(cache_file->filepath, visit_cb, absbase, bpath_user_data);
+			break;
+		}
 		default:
 			/* Nothing to do for other IDs that don't contain file paths. */
 			break;