128eb6cbe9
Previously fluid simulation and Alembic modifiers had a dedicated function to query the velocity for motion blur. Now use a more generic system where those modifiers output a velocity attribute. Advantages: * Geometry and particle nodes can output velocity through the same mechanism, or read the attribute coming from earlier modifiers. * The velocity can be preserved through modifiers like subdivision surface or auto smooth. * USD and Alembic previously only output velocity from fluid simulation, now they work with velocity from other sources too. * Simplifies the code for renderers like Cycles and exporters like Alembic and USD. This breaks compatibility: * External renderers and exporters accessing these velocities through the Python API now need to use the attribute instead. * Existing modifier node setups that create an attribute named "velocity" will render differently with motion blur. Differential Revision: https://developer.blender.org/D12305
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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/** \file
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* \ingroup balembic
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*/
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#include "abc_writer_abstract.h"
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#include "intern/abc_customdata.h"
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#include <Alembic/AbcGeom/OPolyMesh.h>
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#include <Alembic/AbcGeom/OSubD.h>
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struct ModifierData;
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namespace blender::io::alembic {
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/* Writer for Alembic geometry. Does not assume the object is a mesh object. */
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class ABCGenericMeshWriter : public ABCAbstractWriter {
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private:
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/* Either poly-mesh or subdivision-surface is used, depending on is_subd_.
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* References to the schema must be kept, or Alembic will not properly write. */
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Alembic::AbcGeom::OPolyMesh abc_poly_mesh_;
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Alembic::AbcGeom::OPolyMeshSchema abc_poly_mesh_schema_;
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Alembic::AbcGeom::OSubD abc_subdiv_;
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Alembic::AbcGeom::OSubDSchema abc_subdiv_schema_;
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/* Determines whether a poly mesh or a subdivision surface is exported.
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* The value is set by an export option but only true if there is a subdivision modifier on the
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* exported object. */
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bool is_subd_;
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ModifierData *subsurf_modifier_;
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CDStreamConfig m_custom_data_config;
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public:
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explicit ABCGenericMeshWriter(const ABCWriterConstructorArgs &args);
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virtual void create_alembic_objects(const HierarchyContext *context) override;
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virtual Alembic::Abc::OObject get_alembic_object() const override;
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Alembic::Abc::OCompoundProperty abc_prop_for_custom_props() override;
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protected:
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virtual bool is_supported(const HierarchyContext *context) const override;
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virtual void do_write(HierarchyContext &context) override;
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virtual Mesh *get_export_mesh(Object *object_eval, bool &r_needsfree) = 0;
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virtual void free_export_mesh(Mesh *mesh);
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virtual bool export_as_subdivision_surface(Object *ob_eval) const;
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private:
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void write_mesh(HierarchyContext &context, Mesh *mesh);
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void write_subd(HierarchyContext &context, Mesh *mesh);
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template<typename Schema> void write_face_sets(Object *object, Mesh *mesh, Schema &schema);
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void write_arb_geo_params(Mesh *me);
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bool get_velocities(Mesh *mesh, std::vector<Imath::V3f> &vels);
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void get_geo_groups(Object *object,
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Mesh *mesh,
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std::map<std::string, std::vector<int32_t>> &geo_groups);
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};
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/* Writer for Alembic geometry of Blender Mesh objects. */
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class ABCMeshWriter : public ABCGenericMeshWriter {
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public:
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ABCMeshWriter(const ABCWriterConstructorArgs &args);
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protected:
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virtual Mesh *get_export_mesh(Object *object_eval, bool &r_needsfree) override;
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};
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} // namespace blender::io::alembic
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