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, 73 insertions, 0 deletions

diff --git a/source/blender/alembic/intern/abc_transform.h b/source/blender/alembic/intern/abc_transform.h
new file mode 100644
index 00000000000..6a3aae216f2
--- /dev/null
+++ b/source/blender/alembic/intern/abc_transform.h
@@ -0,0 +1,73 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Esteban Tovagliari, Cedric Paille, Kevin Dietrich
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __ABC_TRANSFORM_H__
+#define __ABC_TRANSFORM_H__
+
+#include "abc_object.h"
+
+#include <Alembic/AbcGeom/All.h>
+
+/* ************************************************************************** */
+
+class AbcTransformWriter : public AbcObjectWriter {
+	Alembic::AbcGeom::OXform m_xform;
+	Alembic::AbcGeom::OXformSchema m_schema;
+	Alembic::AbcGeom::XformSample m_sample;
+	Alembic::AbcGeom::OVisibilityProperty m_visibility;
+	Alembic::Abc::M44d m_matrix;
+
+	bool m_is_animated;
+	Object *m_parent;
+	bool m_visible;
+
+public:
+	AbcTransformWriter(Object *ob,
+	                   const Alembic::AbcGeom::OObject &abc_parent,
+	                   AbcTransformWriter *parent,
+	                   unsigned int time_sampling,
+	                   ExportSettings &settings);
+
+	Alembic::AbcGeom::OXform &alembicXform() { return m_xform;}
+	virtual Imath::Box3d bounds();
+	void setParent(Object *p) { m_parent = p; }
+
+private:
+	virtual void do_write();
+
+	bool hasAnimation(Object *ob) const;
+};
+
+/* ************************************************************************** */
+
+class AbcEmptyReader : public AbcObjectReader {
+	Alembic::AbcGeom::IXformSchema m_schema;
+
+public:
+	AbcEmptyReader(const Alembic::Abc::IObject &object, ImportSettings &settings);
+
+	bool valid() const;
+
+	void readObjectData(Main *bmain, float time);
+};
+
+#endif  /* __ABC_TRANSFORM_H__ */