Multiple override graphic settings in one transaction

Revit API
2

Hi,
you need to create a instance of graphics overrides and then just use another overload of SetElementOverrides which takes elementId and OverrideGraphicSettings as inputs.

sth like

ogs = OverrideGraphicSettings()
ogs.SetProjectionFillColor(R,G,B)
ogs.SetProjectionLineColor(R,G,B)
ogs.SetProjectionFillPatternId(pattern.Id)
ogs.SetSurfaceTransparency(100)
ogs.SetHalftone(True)

t = Transaction(doc, 'transparenthalftone')
t.Start()
for i in selection:
    doc.ActiveView.SetElementOverrides(i.Id, ogs)
t.Commit()

In your code → only the last override would be applied

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