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, 70 insertions, 0 deletions

diff --git a/source/blender/alembic/intern/abc_points.h b/source/blender/alembic/intern/abc_points.h
new file mode 100644
index 00000000000..51f3103bd8b
--- /dev/null
+++ b/source/blender/alembic/intern/abc_points.h
@@ -0,0 +1,70 @@
+/*
+ * ***** 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.
+ *
+ * The Original Code is Copyright (C) 2016 Kévin Dietrich.
+ * All rights reserved.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ *
+ */
+
+#ifndef __ABC_POINTS_H__
+#define __ABC_POINTS_H__
+
+#include "abc_object.h"
+#include "abc_customdata.h"
+
+class ParticleSystem;
+
+/* ************************************************************************** */
+
+class AbcPointsWriter : public AbcObjectWriter {
+	Alembic::AbcGeom::OPointsSchema m_schema;
+	Alembic::AbcGeom::OPointsSchema::Sample m_sample;
+	ParticleSystem *m_psys;
+
+public:
+	AbcPointsWriter(Scene *scene,
+	                Object *ob,
+	                AbcTransformWriter *parent,
+	                uint32_t time_sampling,
+	                ExportSettings &settings,
+	                ParticleSystem *psys);
+
+	void do_write();
+};
+
+/* ************************************************************************** */
+
+class AbcPointsReader : public AbcObjectReader {
+	Alembic::AbcGeom::IPointsSchema m_schema;
+	Alembic::AbcGeom::IPointsSchema::Sample m_sample;
+
+public:
+	AbcPointsReader(const Alembic::Abc::IObject &object, ImportSettings &settings);
+
+	bool valid() const;
+
+	void readObjectData(Main *bmain, float time);
+};
+
+void read_points_sample(const Alembic::AbcGeom::IPointsSchema &schema,
+                        const Alembic::AbcGeom::ISampleSelector &selector,
+                        CDStreamConfig &config,
+                        float time);
+
+#endif  /* __ABC_POINTS_H__ */