usd_writer_metaball.cc

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
#include "usd_writer_metaball.hh"
#include "usd_exporter_context.hh"
 
#include "BKE_lib_id.hh"
#include "BKE_mball.hh"
#include "BKE_mesh.hh"
#include "BKE_object.hh"
 
#include "DEG_depsgraph_query.hh"
 
#include "DNA_mesh_types.h"
 
namespace blender::io::usd {
 
USDMetaballWriter::USDMetaballWriter(const USDExporterContext &ctx) : USDGenericMeshWriter(ctx) {}
 
bool USDMetaballWriter::is_supported(const HierarchyContext *context) const
{
  Scene *scene = DEG_get_input_scene(usd_export_context_.depsgraph);
  return is_basis_ball(scene, context->object) && USDGenericMeshWriter::is_supported(context);
}
 
bool USDMetaballWriter::check_is_animated(const HierarchyContext & /*context*/) const
{
  /* We assume that metaballs are always animated, as the current object may
   * not be animated but another ball in the same group may be. */
  return true;
}
 
Mesh *USDMetaballWriter::get_export_mesh(Object *object_eval, bool &r_needsfree)
{
  Mesh *mesh_eval = BKE_object_get_evaluated_mesh(object_eval);
  if (mesh_eval != nullptr) {
    /* Mesh_eval only exists when generative modifiers are in use. */
    r_needsfree = false;
    return mesh_eval;
  }
  r_needsfree = true;
  return BKE_mesh_new_from_object(usd_export_context_.depsgraph, object_eval, false, false);
}
 
void USDMetaballWriter::free_export_mesh(Mesh *mesh)
{
  BKE_id_free(nullptr, mesh);
}
 
bool USDMetaballWriter::is_basis_ball(Scene *scene, Object *ob) const
{
  const Object *basis_ob = BKE_mball_basis_find(scene, ob);
  return ob == basis_ob;
}
 
}  // namespace blender::io::usd