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/*
* 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) 2020 Blender Foundation.
* All rights reserved.
*/
#include "usd_reader_mesh_base.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "BKE_lib_id.h"
#include "BKE_main.h"
#include "BKE_mesh.h"
#include "BKE_object.h"
#include <pxr/usd/usdGeom/imageable.h>
#include <iostream>
namespace blender::io::usd {
std::map<pxr::SdfPath, Mesh *> USDMeshReaderBase::s_prototype_meshes;
USDMeshReaderBase::USDMeshReaderBase(const pxr::UsdPrim &prim, const USDImporterContext &context)
: USDXformableReader(prim, context)
{
}
USDMeshReaderBase::~USDMeshReaderBase()
{
}
void USDMeshReaderBase::create_object(Main *bmain, double time)
{
if (!this->valid()) {
return;
}
/* Determine mesh visibility.
* TODO(makowalski): Consider optimizations to avoid this expensive call,
* for example, by determining visibility during stage traversal. */
pxr::UsdGeomImageable imageable(this->prim_);
if (!imageable) {
std::cerr << "Warning: Invalid mesh imageable schema for " << this->prim_path_ << std::endl;
return;
}
pxr::TfToken vis_tok = imageable.ComputeVisibility();
if (vis_tok == pxr::UsdGeomTokens->invisible) {
return;
}
std::string obj_name = get_object_name();
if (obj_name.empty()) {
/* Sanity check. */
std::cerr << "Warning: couldn't determine object name for " << this->prim_path() << std::endl;
}
object_ = BKE_object_add_only_object(bmain, OB_MESH, obj_name.c_str());
Mesh *mesh = this->read_mesh(bmain, time);
object_->data = mesh;
if (this->context_.import_params.import_materials) {
assign_materials(bmain, mesh, time);
}
}
Mesh *USDMeshReaderBase::read_mesh(Main *bmain, double time)
{
/* If this prim is an instance proxy and instancing is enabled,
* return the shared mesh created by the instance prototype. */
if (this->context_.import_params.use_instancing && this->context_.proto_readers &&
this->prim_.IsInstanceProxy()) {
pxr::UsdPrim proto_prim = this->prim_.GetPrimInMaster();
if (proto_prim) {
pxr::SdfPath proto_path = proto_prim.GetPath();
/* See if the prototype is already been cached. */
std::map<pxr::SdfPath, Mesh *>::const_iterator proto_mesh_iter = s_prototype_meshes.find(
proto_path);
if (proto_mesh_iter != s_prototype_meshes.end()) {
Mesh *cached_mesh = proto_mesh_iter->second;
if (cached_mesh) {
/* Increment the user count before returning. */
id_us_plus(&cached_mesh->id);
}
return cached_mesh;
}
/* No cached mesh. Lookup the reader for the prototype prim. */
ObjectReaderMap::iterator proto_reader_iter = this->context_.proto_readers->find(proto_path);
if (proto_reader_iter != this->context_.proto_readers->end()) {
USDXformableReader *proto_reader = proto_reader_iter->second;
USDMeshReaderBase *proto_mesh_reader = dynamic_cast<USDMeshReaderBase *>(proto_reader);
if (proto_mesh_reader) {
Mesh *proto_mesh = proto_mesh_reader->create_mesh(bmain, time);
if (proto_mesh) {
s_prototype_meshes.insert(std::make_pair(proto_path, proto_mesh));
return proto_mesh;
}
else {
std::cerr << "Couldn't evaluate prototype " << proto_path.GetString()
<< " mesh for instance " << this->prim_path_ << std::endl;
}
}
else {
std::cerr << "Invalid prototype " << proto_path.GetString()
<< " reader type for instance " << this->prim_path_ << std::endl;
}
}
}
}
/* Not sharing the prototype mesh, so create unique mesh data. */
return create_mesh(bmain, time);
}
} // namespace blender::io::usd
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