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The following settings are recommended up to CoCreate Modeling 16.5 and CATIA V5R24 (V5-6R2014) (Dassault).

OneSpace Designer – System

Components of an assembly should have names no longer than 16 characters.
System accuracy should be set prior to modelling.
Recommended values are 10-6 mm, 10-5 mm, 10-4 mm.
The smallest extent value (e.g. edge length) can be set under:
SystemSetting ->Advisor/Check Setting -> min Edge
All Advisor Checks (voids, nonmanifold, knife edge, min edge) should be active while modeling the part.
Complete body checks should be done frequently during design and prior to export to STEP.

OneSpace Designer - STEP Preprocessor

When invoking the STEP export choose as option target system e.g. (CATIA IBM) or CATIA (debis) or Pro/ENGINEER.
If, in case of an assembly export, the option Assemblystructur/Shared Parts is set ON, individual colors of instances cannot be exported.
If the target system cannot process assembly structure information or geometric transformation, then you should select NO to suppress this information.
Hybrid models must be exported with multiple products. You can also use the Structure Browser to make your selection. If you try to specify a part by clicking in a viewpart, you will select only faces or edges instead of the whole part.

STEP File

CATIA V5 (Dassault) - STEP Postprocessor

To import a STEP File please choose File -> Open... and select STEP file.
Recommended settings in the STEP import options (Tools -> Options... -> Compatibility) :
It is recommended to set the Continuity Optimization for Curves and Surfaces for the C2 continuity on Automatic Optimization.
STEP Assemblies created with the MAPPED_ITEM approach are not supported yet by the CATIA V5 translator.
The import logfiles "filename.rpt" and "filename.err" gives further information.
Validation properties are supported.

CATIA V5 (Dassault) – System