IfcMappedItem geometry

[seghier]

I have problem with finding how to get IfcMappedItem geometry like beam, door, window, column ...etc

else if (item is IIfcMappedItem mappedItem)
{
    geometryTypes.Add("MappedItem");

    // Add empty entries for the MappedItem itself to keep lists synchronized
    // We add these now because this function MUST add an entry to every list.
    basePlanes.Add(elementPlane);
    startPoints.Add(elementPlane.Origin);
    profileCurves.Add(null);
    extrusionDepths.Add(0);
    extrusionDirections.Add(Vector3d.Zero);
    polylines.Add(null, path); // *** FIX: Added 'path' argument for DataTree
    boundingBoxCorners.Add(Point3d.Origin);
    boundingBoxDimensions.Add(Vector3d.Zero);
    rectangleXDims.Add(0);
    rectangleYDims.Add(0);

    log.Add("Found MappedItem, now investigating its source representation...");

    // --- NEW LOGGING: Check if the source is valid ---
    if (mappedItem.MappingSource == null || mappedItem.MappingSource.MappedRepresentation == null || !mappedItem.MappingSource.MappedRepresentation.Items.Any())
    {
        log.Add("!!! CRITICAL: MappedItem source or its geometry items are null or empty. Cannot create geometry.");
        return; 
    }
    log.Add($"... Source is valid, containing {mappedItem.MappingSource.MappedRepresentation.Items.Count()} items.");

    // Get the mapping transformation
    Transform mappingTransform = Transform.Identity;
    if (mappedItem.MappingTarget is IIfcCartesianTransformationOperator3D transform3D)
    {
        mappingTransform = ConvertCartesianTransformation3D(transform3D, scale);
        log.Add($"... Calculated 3D mapping transform. IsIdentity: {mappingTransform.IsIdentity}");
    }
    else if (mappedItem.MappingTarget is IIfcCartesianTransformationOperator2D transform2D)
    {
        mappingTransform = ConvertCartesianTransformation2D(transform2D, scale);
        log.Add($"... Calculated 2D mapping transform. IsIdentity: {mappingTransform.IsIdentity}");
    }

    // Store the original collections' counts to apply transformation to newly added items
    int originalProfileCount = profileCurves.Count;
    int originalPolylineBranches = polylines.BranchCount; // Corrected to BranchCount

    // Process the source geometry that is being instanced
    foreach (var mappedItemRep in mappedItem.MappingSource.MappedRepresentation.Items)
    {
        // --- NEW LOGGING: What is the type of the source geometry? ---
        log.Add($"  -> Processing source item of type: {mappedItemRep.GetType().Name}");
        ExtractGeometryData((IIfcGeometricRepresentationItem)mappedItemRep, scale, element, path,
            log, elementIds, geometryTypes, profileCurves, extrusionDepths,
            extrusionDirections, basePlanes, startPoints, polylines,
            boundingBoxCorners, boundingBoxDimensions, rectangleXDims, rectangleYDims);
    }

    // --- NEW LOGGING: Check if any geometry was actually created ---
    int newProfiles = profileCurves.Count - originalProfileCount;
    int newPolylineBranches = polylines.BranchCount - originalPolylineBranches;
    log.Add($"... Finished processing source. Found {newProfiles} new profiles and {newPolylineBranches} new polyline branches.");

    // Apply mapping transformation to newly added geometry if any was created
    if (newProfiles > 0 || newPolylineBranches > 0)
    {
        ApplyTransformationToNewGeometry(mappingTransform, originalProfileCount, originalPolylineBranches,
            profileCurves, polylines, basePlanes, startPoints, boundingBoxCorners);
        log.Add("... Successfully applied mapping transformation to new geometry.");
    }
    else
    {
        log.Add("... No new geometry was created from the source, so no transformation was applied.");
    }
}

[andyward]

What exactly is the problem you're seeing?

[seghier]

I get the properties, materials, types but the geometry itself is missing
I think because it is block instance or mesh?

[martin1cerny]

Can you write it as a minimal test? Did you try to debug and navigate the data structures?