Method doOperation

src/IECoreScene/ParticleReader.cpp:160–202

}

ObjectPtr ParticleReader::doOperation( const CompoundObject * operands )
{
	vector<string> attributes;
	particleAttributes( attributes );
	PointsPrimitivePtr result = new PointsPrimitive( numParticles() );
	// because of percentage filtering we don't really know the number of points until we've loaded an attribute.
	// we start off with numParticles() in case there aren't any varying attributes in the cache at all, but replace it
	// below as soon as we have a revised (percentage filtered) value.
	bool haveNumPoints = false;
	for( vector<string>::const_iterator it = attributes.begin(); it!=attributes.end(); it++ )
	{
		DataPtr d = readAttribute( *it );

		if ( testTypedData<TypeTraits::IsVectorTypedData>( d.get() ) )
		{
			size_t s = despatchTypedData< TypedDataSize, TypeTraits::IsVectorTypedData >( d.get() );
			if( !haveNumPoints )
			{
				result->setNumPoints( s );
				haveNumPoints = true;
			}
			if( s==result->getNumPoints() )
			{
				string primVarName = *it;
				if( convertPrimVarNames() && primVarName == positionPrimVarName() )
				{
					// Current attribute is the position. Use "P" instead.
					primVarName = "P";
				}
				result->variables.insert( PrimitiveVariableMap::value_type( primVarName, PrimitiveVariable( PrimitiveVariable::Vertex, d ) ) );
			}
			else
			{
				msg( Msg::Warning, "ParticleReader::doOperation", format( "Ignoring attribute \"%s\" due to insufficient elements (expected %d but found %d)." ) % *it % result->getNumPoints() % s );
			}
		}
		else if ( testTypedData<TypeTraits::IsSimpleTypedData>( d.get() ) )
		{
			result->variables.insert( PrimitiveVariableMap::value_type( *it, PrimitiveVariable( PrimitiveVariable::Constant, d ) ) );
		}
	}
	return result;
}

float ParticleReader::particlePercentage() const
{