/// <summary>
/// This is the method that actually does the work.
/// </summary>
/// <param name="DA">The DA object is used to retrieve from inputs and store in outputs.</param>
protected override void SolveInstance(IGH_DataAccess DA)
{
IMesh mesh = new IMesh();
double length = 1;
List <int> eKeys = new List <int>();
DA.GetData(0, ref mesh);
DA.GetDataList(1, eKeys);
DA.GetData(2, ref length);
IMesh dM = IModifier.ExtrudeTwoDimensionalElements(mesh, eKeys, length);
DA.SetData(0, dM);
}