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, 3 insertions, 0 deletions

diff --git a/source/blender/depsgraph/DEG_depsgraph_build.h b/source/blender/depsgraph/DEG_depsgraph_build.h
index 49b648c7dae..0209e94debe 100644
--- a/source/blender/depsgraph/DEG_depsgraph_build.h
+++ b/source/blender/depsgraph/DEG_depsgraph_build.h
@@ -79,6 +79,7 @@ void DEG_scene_graph_free(struct Scene *scene);
  */
 struct DepsNodeHandle;
 
+struct CacheFile;
 struct Object;
 
 typedef enum eDepsSceneComponentType {
@@ -100,11 +101,13 @@ typedef enum eDepsObjectComponentType {
 	
 	DEG_OB_COMP_EVAL_PARTICLES,    /* Particle Systems Component */
 	DEG_OB_COMP_SHADING,           /* Material Shading Component */
+	DEG_OB_COMP_CACHE,             /* Cache Component */
 } eDepsObjectComponentType;
 
 void DEG_add_scene_relation(struct DepsNodeHandle *node, struct Scene *scene, eDepsSceneComponentType component, const char *description);
 void DEG_add_object_relation(struct DepsNodeHandle *node, struct Object *ob, eDepsObjectComponentType component, const char *description);
 void DEG_add_bone_relation(struct DepsNodeHandle *handle, struct Object *ob, const char *bone_name, eDepsObjectComponentType component, const char *description);
+void DEG_add_object_cache_relation(struct DepsNodeHandle *handle, struct CacheFile *cache_file, eDepsObjectComponentType component, const char *description);
 
 /* TODO(sergey): Remove once all geometry update is granular. */
 void DEG_add_special_eval_flag(struct Depsgraph *graph, struct ID *id, short flag);