Offset horizontally or vertically? What version are you using?
Allen
Allen Jessup
CAD Manager - Designer
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Change it to static, offset as you wish then change the original back to dynamic. (The offset isn't dynamic but creating and sampling another surface would get a dynamic profile)
neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2025 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760
Why try to turn a Profile into a polyline? A polyline can't represent the curves in a Profile, so if you have any vertical curves, the polyline would have to be tesselated.
Why not just copy the Profile? (Select the Profile, right-click -> Edit Geometry, then use "Copy Profile" in the Profile Geometry tools.) Then raise/lower the copy by the desired amount. This also gives you the benefit of being able to put Labels on your offset Profile.
Not that I don't agree that you should stick with Civil 3D objects as much as possible and I don't know the OPs intentions. But your suggestion runs into the same problem as you would with a Surface. Raising or lowering is not an offset.
Since most design is based on a height above ground of some other reference. Raising or lowering a copy would be appropriate. But in a case where an actual offset is required (can't think of an example myself) then is doesn't work.
Allen
Allen Jessup
CAD Manager - Designer
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I presumed the OP wanted to "offest" by raising or lowering which won't obviously be a true offset but sometimes is adequate for the purpose- perhaps he/she will clarify the intent
neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2025 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760
I agree. As I said I couldn't think of any reason why you would need a true offset. But the OP may have more imagination than I do of his bosses may be crazier than those I've worked for!
Allen
Allen Jessup
CAD Manager - Designer
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