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IGES import and export
Level Mapping is not working on export
When using IGES export, level mapping (layers) is not supported.
Additional transform nodes are created for trimmed surfaces
When using IGES export, trimmed surfaces can be exported with extra transform nodes.
Non-planar planes not imported
Some systems, namely CATIA V5, write out non-planar plane entities. This is not currently supported by our IGES import.