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Revit surfaces aren't very accurate -- they're meant to provide a "pretty picture" in the Revit model. I wouldn't want to use it as the basis for design.
Don Ireland
Engineering Design Technician
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Brian,
He wants to go the other direction: from Revit to C3D.
I don't doubt that it's possible. But knowing that I'd never want to do so, I've never investigated how. But since the bulk of the effort will be done in Revit, I'd suggest posting in the Revit forum (link below) and ask about exporting a Topo surface for use in C3D.
http://forums.autodesk.com/t5/Revit/ct-p/2003
Don Ireland
Engineering Design Technician
If a reply solves your issue, please remember to click on "Accept as Solution". This will help other users looking to solve a similar issue. Thank you.
Please do not send a PM asking for assistance. That's what the forums are for. This allows everyone to benefit from the question asked and the answers given.
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