/// <summary>
/// Create the handle corresponding to the "Axis" IfcRepresentation for a structural member objects, if possible.
/// </summary>
/// <param name="exporterIFC">The ExporterIFC class.</param>
/// <param name="element">The structural member element.</param>
/// <param name="catId">The structural member category id.</param>
/// <param name="axisInfo">The optional structural member axis information.</param>
/// <param name="offsetTransform">The optional offset transform applied to the "Body" representation.</param>
/// <returns>The handle, or null if not created.</returns>
public static IFCAnyHandle CreateStructuralMemberAxis(ExporterIFC exporterIFC, Element element, ElementId catId, StructuralMemberAxisInfo axisInfo, Transform newTransformLCS)
{
if (axisInfo == null)
{
return(null);
}
// This Axis should have been transformed into its ECS position previously (in GetStructuralMemberAxisTransform())
Curve curve = axisInfo.Axis;
Transform offset = Transform.Identity;
if (newTransformLCS != null)
{
// We need to flip the Left-handed transform to the right-hand one as IFC only support right-handed coordinate system
if (newTransformLCS.Determinant < 0)
{
XYZ orig = newTransformLCS.Origin;
newTransformLCS.Origin = XYZ.Zero;
offset = FlipYTrf().Multiply(newTransformLCS);
offset.Origin = orig;
}
else
{
offset = newTransformLCS;
}
}
// Calculate the transformation matrix to tranform the original Axis Curve at its ECS into the new ECS assigned in the offset
curve = curve.CreateTransformed(offset.Inverse.Multiply(axisInfo.LCSAsTransform));
IDictionary <IFCFuzzyXYZ, IFCAnyHandle> cachePoints = new Dictionary <IFCFuzzyXYZ, IFCAnyHandle>();
IFCAnyHandle ifcCurveHnd;
try
{
ifcCurveHnd = GeometryUtil.CreateIFCCurveFromRevitCurve(exporterIFC.GetFile(), exporterIFC, curve, true, cachePoints);
}
catch
{
ifcCurveHnd = GeometryUtil.OutdatedCreateIFCCurveFromRevitCurve(exporterIFC.GetFile(), exporterIFC, curve, true, cachePoints);
}
IList <IFCAnyHandle> axis_items = new List <IFCAnyHandle>();
if (!(IFCAnyHandleUtil.IsNullOrHasNoValue(ifcCurveHnd)))
{
axis_items.Add(ifcCurveHnd);
}
if (axis_items.Count > 0)
{
string identifierOpt = "Axis"; // This is by IFC2x2+ convention.
string representationTypeOpt = "Curve3D"; // This is by IFC2x2+ convention.
IFCAnyHandle axisRep = RepresentationUtil.CreateShapeRepresentation(exporterIFC, element, catId, exporterIFC.Get3DContextHandle(identifierOpt),
identifierOpt, representationTypeOpt, axis_items);
return(axisRep);
}
return(null);
}