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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 "abc_axis_conversion.h"
#include "abc_writer_transform.h"
#include "DNA_curve_types.h"
#include "DNA_object_types.h"
#include "BLI_listbase.h"
#include "BKE_curve.h"
using Alembic::AbcGeom::FloatArraySample;
using Alembic::AbcGeom::OBoolProperty;
using Alembic::AbcGeom::OCompoundProperty;
using Alembic::AbcGeom::ONuPatch;
using Alembic::AbcGeom::ONuPatchSchema;
AbcNurbsWriter::AbcNurbsWriter(Object *ob,
AbcTransformWriter *parent,
uint32_t time_sampling,
ExportSettings &settings)
: AbcObjectWriter(ob, time_sampling, settings, parent)
{
m_is_animated = isAnimated();
/* if the object is static, use the default static time sampling */
if (!m_is_animated) {
m_time_sampling = 0;
}
Curve *curve = static_cast<Curve *>(m_object->data);
size_t numNurbs = BLI_listbase_count(&curve->nurb);
for (size_t i = 0; i < numNurbs; i++) {
std::stringstream str;
str << m_name << '_' << i;
while (parent->alembicXform().getChildHeader(str.str())) {
str << "_";
}
ONuPatch nurbs(parent->alembicXform(), str.str().c_str(), m_time_sampling);
m_nurbs_schema.push_back(nurbs.getSchema());
}
}
bool AbcNurbsWriter::isAnimated() const
{
/* check if object has shape keys */
Curve *cu = static_cast<Curve *>(m_object->data);
return (cu->key != NULL);
}
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()
{
/* we have already stored a sample for this object. */
if (!m_first_frame && !m_is_animated) {
return;
}
if (!ELEM(m_object->type, OB_SURF, OB_CURVE)) {
return;
}
Curve *curve = static_cast<Curve *>(m_object->data);
ListBase *nulb;
if (m_object->runtime.curve_cache->deformed_nurbs.first != NULL) {
nulb = &m_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 = m_nurbs_schema[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);
}
m_nurbs_schema[count].set(sample);
}
}
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