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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.
*/
/** \file
* \ingroup balembic
*/
#include "abc_writer_nurbs.h"
#include "intern/abc_axis_conversion.h"
#include "DNA_curve_types.h"
#include "DNA_object_types.h"
#include "BLI_listbase.h"
#include "BKE_curve.h"
#include "CLG_log.h"
static CLG_LogRef LOG = {"io.alembic"};
namespace blender {
namespace io {
namespace alembic {
using Alembic::Abc::OObject;
using Alembic::AbcGeom::FloatArraySample;
using Alembic::AbcGeom::OBoolProperty;
using Alembic::AbcGeom::OCompoundProperty;
using Alembic::AbcGeom::ONuPatch;
using Alembic::AbcGeom::ONuPatchSchema;
ABCNurbsWriter::ABCNurbsWriter(const ABCWriterConstructorArgs &args) : ABCAbstractWriter(args)
{
}
void ABCNurbsWriter::create_alembic_objects(const HierarchyContext *context)
{
Curve *curve = static_cast<Curve *>(context->object->data);
size_t num_nurbs = BLI_listbase_count(&curve->nurb);
OObject abc_parent = args_.abc_parent;
const char *abc_parent_path = abc_parent.getFullName().c_str();
for (size_t i = 0; i < num_nurbs; i++) {
std::stringstream patch_name_stream;
patch_name_stream << args_.abc_name << '_' << i;
while (abc_parent.getChildHeader(patch_name_stream.str())) {
patch_name_stream << "_";
}
std::string patch_name = patch_name_stream.str();
CLOG_INFO(&LOG, 2, "exporting %s/%s", abc_parent_path, patch_name.c_str());
ONuPatch nurbs(abc_parent, patch_name, timesample_index_);
abc_nurbs_.push_back(nurbs);
abc_nurbs_schemas_.push_back(nurbs.getSchema());
}
}
OObject ABCNurbsWriter::get_alembic_object() const
{
if (abc_nurbs_.empty()) {
return OObject();
}
/* For parenting purposes within the Alembic file, all NURBS patches are equal, so just use the
* first one. */
return abc_nurbs_[0];
}
bool ABCNurbsWriter::check_is_animated(const HierarchyContext &context) const
{
/* Check if object has shape keys. */
Curve *cu = static_cast<Curve *>(context.object->data);
return (cu->key != NULL);
}
bool ABCNurbsWriter::is_supported(const HierarchyContext *context) const
{
return ELEM(context->object->type, OB_SURF, OB_CURVE);
}
static void get_knots(std::vector<float> &knots, const int num_knots, float *nu_knots)
{
if (num_knots <= 1) {
return;
}
/* Add an extra knot at the beginning and end of the array since most apps
* require/expect them. */
knots.reserve(num_knots + 2);
knots.push_back(0.0f);
for (int i = 0; i < num_knots; i++) {
knots.push_back(nu_knots[i]);
}
knots[0] = 2.0f * knots[1] - knots[2];
knots.push_back(2.0f * knots[num_knots] - knots[num_knots - 1]);
}
void ABCNurbsWriter::do_write(HierarchyContext &context)
{
Curve *curve = static_cast<Curve *>(context.object->data);
ListBase *nulb;
if (context.object->runtime.curve_cache->deformed_nurbs.first != NULL) {
nulb = &context.object->runtime.curve_cache->deformed_nurbs;
}
else {
nulb = BKE_curve_nurbs_get(curve);
}
size_t count = 0;
for (Nurb *nu = static_cast<Nurb *>(nulb->first); nu; nu = nu->next, count++) {
std::vector<float> knotsU;
get_knots(knotsU, KNOTSU(nu), nu->knotsu);
std::vector<float> knotsV;
get_knots(knotsV, KNOTSV(nu), nu->knotsv);
const int size = nu->pntsu * nu->pntsv;
std::vector<Imath::V3f> positions(size);
std::vector<float> weights(size);
const BPoint *bp = nu->bp;
for (int i = 0; i < size; i++, bp++) {
copy_yup_from_zup(positions[i].getValue(), bp->vec);
weights[i] = bp->vec[3];
}
ONuPatchSchema::Sample sample;
sample.setUOrder(nu->orderu + 1);
sample.setVOrder(nu->orderv + 1);
sample.setPositions(positions);
sample.setPositionWeights(weights);
sample.setUKnot(FloatArraySample(knotsU));
sample.setVKnot(FloatArraySample(knotsV));
sample.setNu(nu->pntsu);
sample.setNv(nu->pntsv);
/* TODO(kevin): to accommodate other software we should duplicate control
* points to indicate that a NURBS is cyclic. */
OCompoundProperty user_props = abc_nurbs_schemas_[count].getUserProperties();
if ((nu->flagu & CU_NURB_ENDPOINT) != 0) {
OBoolProperty prop(user_props, "endpoint_u");
prop.set(true);
}
if ((nu->flagv & CU_NURB_ENDPOINT) != 0) {
OBoolProperty prop(user_props, "endpoint_v");
prop.set(true);
}
if ((nu->flagu & CU_NURB_CYCLIC) != 0) {
OBoolProperty prop(user_props, "cyclic_u");
prop.set(true);
}
if ((nu->flagv & CU_NURB_CYCLIC) != 0) {
OBoolProperty prop(user_props, "cyclic_v");
prop.set(true);
}
abc_nurbs_schemas_[count].set(sample);
}
}
} // namespace alembic
} // namespace io
} // namespace blender
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