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, 1 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_space_types.h b/source/blender/makesdna/DNA_space_types.h
index 4ce0f369ebd..41188c2412f 100644
--- a/source/blender/makesdna/DNA_space_types.h
+++ b/source/blender/makesdna/DNA_space_types.h
@@ -738,6 +738,7 @@ typedef enum eFileSel_File_Types {
 	FILE_TYPE_COLLADA           = (1 << 13),
 	FILE_TYPE_OPERATOR          = (1 << 14), /* from filter_glob operator property */
 	FILE_TYPE_APPLICATIONBUNDLE = (1 << 15),
+	FILE_TYPE_ALEMBIC           = (1 << 16),
 
 	FILE_TYPE_DIR               = (1 << 30),  /* An FS directory (i.e. S_ISDIR on its path is true). */
 	FILE_TYPE_BLENDERLIB        = (1 << 31),