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Sweeping along a 3d polyline - twist of a profile

Hi,

 

I use AutoCad 2011 and would like to sweep a bridge cross section along a road axis - a 3d polyline generated in AutoCad Civil 3d 2013 -, but I'm not satisfied with the outcome, since the profile is obviously twisted during solid generation - the inclination of generated cross sections is not correct (3.8% instead of 3.5%)... Off course I disabled the twist and bank in command parameters. Is this an error or is it normal? If anyone can help I will really apreciate it...

 

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