OVisibilityProperty
CreateVisibilityProperty( OObject & iObject,
AbcA::TimeSamplingPtr iTimeSampling )
{
OVisibilityProperty emptyProperty;
if ( iTimeSampling )
{
uint32_t iTimeSamplingID;
iTimeSamplingID = iObject.getArchive().addTimeSampling(
*iTimeSampling );
return CreateVisibilityProperty( iObject, iTimeSamplingID );
}
return emptyProperty;
}
//-*****************************************************************************
//-*****************************************************************************
//-*****************************************************************************
// PARTICLES WRITER
//-*****************************************************************************
//-*****************************************************************************
//-*****************************************************************************
void RunAndWriteParticles
(
OObject &iParent,
const ParticleSystem::Parameters &iParams,
size_t iNumFrames,
chrono_t iFps
)
{
// Make the particle system.
ParticleSystem parts( iParams );
// Create the time sampling type.
TimeSampling ts(iFps, 0.0);
Alembic::Util::uint32_t tsidx = iParent.getArchive().addTimeSampling(ts);
// Create our object.
OPoints partsOut( iParent, "simpleParticles", tsidx );
std::cout << "Created Simple Particles" << std::endl;
// Add attributes
OPointsSchema &pSchema = partsOut.getSchema();
MetaData mdata;
SetGeometryScope( mdata, kVaryingScope );
OV3fArrayProperty velOut( pSchema, "velocity", mdata, tsidx );
OC3fArrayProperty rgbOut( pSchema, "Cs", tsidx );
OFloatArrayProperty ageOut( pSchema, "age", tsidx );
// Get seconds per frame.
chrono_t iSpf = 1.0 / iFps;
// CJH: Until we fix zero-array-property bug, loop a few frames.
for ( int preRoll = 0; preRoll < 100; ++preRoll )
{
parts.timeStep( iSpf );
if ( parts.numParticles() > 0 )
{
break;
}
}
ABCA_ASSERT( parts.numParticles() > 0,
"Degenerate particle system" );
// Loop over the frames.
for ( index_t sampIndex = 0;
sampIndex < ( index_t )iNumFrames; ++sampIndex )
{
// First, write the sample.
OPointsSchema::Sample psamp(
V3fArraySample( parts.positionVec() ),
UInt64ArraySample( parts.idVec() ) );
pSchema.set( psamp );
velOut.set( V3fArraySample( parts.velocityVec() ) );
rgbOut.set( C3fArraySample( parts.colorVec() ) );
ageOut.set( FloatArraySample( parts.ageVec() ) );
// Now time step.
parts.timeStep( iSpf );
// Print!
std::cout << "Wrote " << parts.numParticles()
<< " particles to frame: " << sampIndex << std::endl;
}
// End it.
std::cout << "Finished Sim, About to finish writing" << std::endl;
}
