"Create Drawing" not working for some views.

[Owuraqu]

Good morning. When I try to create some elevation drawings I get “An unkwown error occurred” report. Only one elevation (West Elevation) has been successful. I had same problem with creating some of the sections but when I deleted and created the section views again it worked but for the other three elevations it doesn’t work even after deleting and recreating them except the West Elevation. I even uninstalled and updated BB to yesterday’s version but same error surfaces. Find
ifc file.

[Moult]

@aothms what's the easiest way to help you debug these types of issues? I've isolated it to this file (containing only the terrain and a wall - if you remove one or the other, it works, but when both are together, they fail) and test script:

wallterrain.ifc.txt

import ifcopenshell
import ifcopenshell.geom
import multiprocessing

ifc = ifcopenshell.open("/home/dion/tmp/svgcreationbug/wallterrain.ifc")

svg_settings = ifcopenshell.geom.settings(
    DISABLE_TRIANGULATION=True, STRICT_TOLERANCE=True, INCLUDE_CURVES=True
)
svg_buffer = ifcopenshell.geom.serializers.buffer()
serialiser = ifcopenshell.geom.serializers.svg(svg_buffer, svg_settings)
serialiser.setFile(ifc)
serialiser.setWithoutStoreys(True)
serialiser.setPolygonal(True)
serialiser.setUseHlrPoly(True)
# Objects with more than these edges are rendered as wireframe instead of HLR for optimisation
serialiser.setProfileThreshold(10000)
serialiser.setUseNamespace(True)
serialiser.setAlwaysProject(True)
serialiser.setAutoElevation(False)
serialiser.setAutoSection(False)
serialiser.setPrintSpaceNames(False)
serialiser.setPrintSpaceAreas(False)
serialiser.setDrawDoorArcs(False)
serialiser.setNoCSS(True)
serialiser.setElevationRefGuid('2vdjFQTKTB98l6RJP4va8z')
serialiser.setScale(0.01)
serialiser.setSubtractionSettings(ifcopenshell.ifcopenshell_wrapper.ALWAYS)
serialiser.setUsePrefiltering(True)
serialiser.setUnifyInputs(True)
serialiser.setSegmentProjection(True)

geom_settings = ifcopenshell.geom.settings(
    DISABLE_TRIANGULATION=True, STRICT_TOLERANCE=True, INCLUDE_CURVES=True
)
geom_settings.set_context_ids([8275])
it = ifcopenshell.geom.iterator(
    geom_settings, 
    ifc, 
    multiprocessing.cpu_count(), 
    # 8253 (Terrain), 8309 (Wall), 8339 (Camera)
    include={ifc.by_id(i) for i in [8253, 8309, 8339]}
)

def yield_from_iterator(it):
    if it.initialize():
        while True:
            yield it.get()
            if not it.next():
                break

for elem in yield_from_iterator(it):
    serialiser.write(elem)
serialiser.finalize()
print(svg_buffer.get_value())

[Owuraqu]

Okay I will try and delete the terrain from the model as @Moult and @aothms tries to get this resolved. Thank you @Moult.