code: public void add(MultiVertexGeometryImpl src, int beginIndex, int endIndex) {
  		int endIndexC = endIndex < 0 ? src.getPointCount() : endIndex;
  		if (beginIndex < 0 || beginIndex > src.getPointCount()
  				|| endIndexC < beginIndex)
  			throw new IllegalArgumentException();
  
  		if (beginIndex == endIndexC)
  			return;
  
  		mergeVertexDescription(src.getDescription());
  		int count = endIndexC - beginIndex;
  		int oldPointCount = m_pointCount;
  		resize(m_pointCount + count);
  		_verifyAllStreams();
  		for (int iattrib = 0, nattrib = src.getDescription()
  				.getAttributeCount(); iattrib < nattrib; iattrib++) {
  			int semantics = src.getDescription()._getSemanticsImpl(iattrib);
  			int ncomps = VertexDescription.getComponentCount(semantics);
  			AttributeStreamBase stream = getAttributeStreamRef(semantics);
  			AttributeStreamBase srcStream = src
  					.getAttributeStreamRef(semantics);
  			stream.insertRange(oldPointCount * ncomps, srcStream, beginIndex
  					* ncomps, count * ncomps, true, 1, oldPointCount * ncomps);
  		}
  	}
docs: Appends points from another MultiVertexGeometryImpl at the end of this
  one.
  
  @param src
  The source MultiVertexGeometryImpl