Method open

src/IECoreScene/NParticleReader.cpp:102–175

}

bool NParticleReader::open()
{
	if( !m_iffFile || m_iffFileName!=fileName() )
	{
		m_iffFile = new IFFFile( fileName().c_str() );

		IFFFile::Chunk *root = m_iffFile->root();
		IFFFile::Chunk::ChunkIterator headerIt = root->childrenBegin();

		if ( !headerIt->isGroup() || headerIt->groupName().id() != kCACH )
		{
			m_header.valid = false;
			return false;
		}

		IFFFile::Chunk::ChunkIterator child = headerIt->childrenBegin();
		for ( ; child != headerIt->childrenEnd(); child++ )
		{
			if ( child->type().id() == kVRSN )
			{
				child->read( m_header.version );
			}
			else if ( child->type().id() == kSTIM )
			{
				child->read( m_header.startTime );
			}
			else if ( child->type().id() == kETIM )
			{
				child->read( m_header.endTime );
			}
		}

		m_frames->writable().clear();
		frameToRootChildren.clear();

		// single frame per file
		if ( m_header.startTime == m_header.endTime && (headerIt+1)->groupName().id() == kMYCH )
		{
			frameToRootChildren[m_header.startTime] = headerIt + 1;
			m_frames->writable().push_back( m_header.startTime );
		}
		// multiple frames per file
		else
		{
			IFFFile::Chunk::ChunkIterator bodyIt = headerIt;
			for ( ; bodyIt != root->childrenEnd(); bodyIt++ )
			{
				if ( bodyIt->groupName().id() == kMYCH )
				{
					// check children for TIME
					IFFFile::Chunk::ChunkIterator bodyChild = bodyIt->childrenBegin();
					for ( ; bodyChild != bodyIt->childrenEnd(); bodyChild++ )
					{
						if ( bodyChild->type().id() == kTIME )
						{
							int time = 0;
							bodyChild->read( time );
							frameToRootChildren[time] = bodyIt;