It is for this reason we don't attempt this functionality, but use the MX command Major options HALGN and VALGN to create the alignment/profile objects. This makes it impossible for Autodesk to write this data in a reliable way into the GENIO format and have MX recreate a consistent alignment and profile. One of the primary reasons for this lies in differences between the way Civil 3D and MX calculate and store alignment/profile data. Therein lies a problem the online help introduction states "It should be noted that the Import/Export Extension for GENIO does not aim to provide round-trip support for GENIO and Model File data between Bentley MX and AutoCAD Civil 3D." So, quite logically they try to reimport it into Civil 3D to see what it looks like. The challenge is that they don't have both Civil 3D and MX on their computer and they want to test the file exported from Civil 3D to see if it meets their expectations as a deliverable.
I've been having discussions with customers who use both Civil 3D and MX on their projects and they've uncovered a challenge when using GENIO export as a means to provide a model deliverable from Civil 3D. For example, this means you can put other commands in the same file to draw that data to your screen, or edit it in some way. It is a 'Major Option' in the MX Command Language, it's a means to import and export data from MX models, somewhat akin to LandXML but it's really a command script that drives MX, into which you can embed data. GENIO isn't strictly speaking a file format. You can install an extension for Civil 3D from Autodesk Subscription Center that enables you to import data from Bentley ® MX ® GENIO and 'modelfiles' (MX users will know what they are) and also to export GENIO files. My name is Ian McGregor and I've been involved in Infrastructure Product Management at Autodesk for the past 6 years or so, but I have a long history with MOSS ® and MXROAD ®. Jack's been badgering me to write a guest post on his blog for ages, so at last, here is my first one.
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