diff options
author | Sybren A. Stüvel <sybren@blender.org> | 2020-06-19 17:36:10 +0300 |
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committer | Sybren A. Stüvel <sybren@blender.org> | 2020-06-30 12:38:46 +0300 |
commit | 2917df21adc8a1ce0423349909db61d22a38d451 (patch) | |
tree | 35b8ccdf0078fda4f186821b016701f46cb42c86 /source/blender/io/alembic/exporter/abc_writer_mball.h | |
parent | a2b7c84ae8eadf5983ee42091ce4e33315ca83ce (diff) |
Alembic: new exporter based on the USD exporter structure
The Alembic exporter has been restructured by leverages the
`AbstractHierarchyIterator` introduced by the USD exporter. The produced
Alembic files have not changed much (details below), as the Alembic
writing code has simply been moved from the old exporter to the new. How
the export hierarchy is handled changed a lot, though, and also the way
in which transforms are computed. As a result, T71395 is fixed.
Differences between the old and new exporter, in terms of the produced
Alembic file:
- Duplicated objects now have a unique numerical suffix.
- Matrices are computed differently, namely by simply computing the
evaluated transform of the object relative to the evaluated transform
of its export-parent. This fixes {T71395}, but otherwise should
produce the same result as before (but with simpler code).
Compared to the old Alembic exporter, Subdivision modifiers are now
disabled in a cleaner, more efficient way (they are disabled when
exporting with the "Apply Subdivisions" option is unchecked). Previously
the exporter would move to a new frame, disable the modifier, evaluate
the object, and enable the modifier again. This is now done before
exporting starts, and modifiers are only restored when exporting ends.
Some issues with the old Alembic exporter that have NOT been fixed in
this patch:
- Exporting NURBS patches and curves (see T49114 for example).
- Exporting flattened hierarchy in combination with dupli-objects. This
seems to be broken in the old Alembic exporter as well, but nobody
reported this yet.
Differential Revision: https://developer.blender.org/D7664
Reviewed By: Sergey
Diffstat (limited to 'source/blender/io/alembic/exporter/abc_writer_mball.h')
-rw-r--r-- | source/blender/io/alembic/exporter/abc_writer_mball.h | 31 |
1 files changed, 8 insertions, 23 deletions
diff --git a/source/blender/io/alembic/exporter/abc_writer_mball.h b/source/blender/io/alembic/exporter/abc_writer_mball.h index d632f0bd410..90d8c4d4b15 100644 --- a/source/blender/io/alembic/exporter/abc_writer_mball.h +++ b/source/blender/io/alembic/exporter/abc_writer_mball.h @@ -20,39 +20,24 @@ */ #include "abc_writer_mesh.h" -#include "abc_writer_object.h" - -struct Main; -struct Object; namespace blender { namespace io { namespace alembic { -/* AbcMBallWriter converts the metaballs to meshes at every frame, - * and defers to AbcGenericMeshWriter to perform the writing - * to the Alembic file. Only the basis balls are exported, as this - * results in the entire shape as one mesh. */ -class AbcMBallWriter : public AbcGenericMeshWriter { - Main *m_bmain; - +class ABCMetaballWriter : public ABCGenericMeshWriter { public: - explicit AbcMBallWriter(Main *bmain, - Object *ob, - AbcTransformWriter *parent, - uint32_t time_sampling, - ExportSettings &settings); - - ~AbcMBallWriter(); - - static bool isBasisBall(Scene *scene, Object *ob); + explicit ABCMetaballWriter(const ABCWriterConstructorArgs &args); protected: - Mesh *getEvaluatedMesh(Scene *scene_eval, Object *ob_eval, bool &r_needsfree) override; - void freeEvaluatedMesh(struct Mesh *mesh) override; + virtual Mesh *get_export_mesh(Object *object_eval, bool &r_needsfree) override; + virtual void free_export_mesh(Mesh *mesh) override; + virtual bool is_supported(const HierarchyContext *context) const override; + virtual bool check_is_animated(const HierarchyContext &context) const override; + virtual bool export_as_subdivision_surface(Object *ob_eval) const override; private: - bool isAnimated() const override; + bool is_basis_ball(Scene *scene, Object *ob) const; }; } // namespace alembic |