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   Ok, this is an issue that has been giving me an immense amount of 
trouble, I'll try to explain it the best I can...

I was given a 
set of topographic data comprised of polylines, the size and complexity 
of the file was such that it is impossible for me to import it into 
Revit and be able to edit (grade) the surface once I created a 
toposurface. 

So... the solution I came up with that by all means
 should work was to make all the necessary grading changes in AutoCad 
before importing the file into Revit and creating the toposurface. This 
way once the toposurface is generated in Revit it will already have all 
of the grading and places for the building pads in place and all I would
 have to do is drop my buildings on top of it. 

This is where I 
cannot figure out what is going wrong...I make the necessary grading 
changes in AutoCad and everything looks fine...but once I import the 
file into Revit and create the toposurface it gets all messed up...
To
 illustrate this I will include screen shots of both the AutoCad file 
and the Revit file.

AutoCad image: 

http://www.freeimagehosting.net/image.php?8768acfaf3.jpg

Revit image:

http://www.freeimagehosting.net/image.php?8b5d5f0e96.jpg

Any help or suggestions on how to solve this 
issue would be greatly appriciated!

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Schwarz04 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27.Mar.2010 Location: United States Status: Offline Points: 3	Topic: AutoCad to Revit problem Posted: 27.Mar.2010 at 20:34
	Ok, this is an issue that has been giving me an immense amount of trouble, I'll try to explain it the best I can... I was given a set of topographic data comprised of polylines, the size and complexity of the file was such that it is impossible for me to import it into Revit and be able to edit (grade) the surface once I created a toposurface. So... the solution I came up with that by all means should work was to make all the necessary grading changes in AutoCad before importing the file into Revit and creating the toposurface. This way once the toposurface is generated in Revit it will already have all of the grading and places for the building pads in place and all I would have to do is drop my buildings on top of it. This is where I cannot figure out what is going wrong...I make the necessary grading changes in AutoCad and everything looks fine...but once I import the file into Revit and create the toposurface it gets all messed up... To illustrate this I will include screen shots of both the AutoCad file and the Revit file. AutoCad image: http://www.freeimagehosting.net/image.php?8768acfaf3.jpg Revit image: http://www.freeimagehosting.net/image.php?8b5d5f0e96.jpg Any help or suggestions on how to solve this issue would be greatly appriciated!

CarlB Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 16.Oct.2009 Location: United States Status: Offline Points: 321	Posted: 28.Mar.2010 at 03:56
	From the screenshots it looks like the Autocad data is merely polylines with elevation, not a defined "surface". I assume Revit tries to make a surface from this info and doesn't know how to interpret the abrupt contour changes around the cutout area. Don't know ow to fix it but can guess- -create as surface from the polylines first, using something like "edgesurf" -or, do all your grading in Revit. Reduce the file size first by weeding" the contours (lisp routine)

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AutoCad to Revit problem

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