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Forums >> Community >> Newbies >> Exporting DWG issues
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Joined: Thu, Mar 12, 2015
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Hi!I'm using Revit 2014 and I have an issue with exporting small objects. When I export to DWG a sheet with a view placed in it (with a view scale of 1:100) everything is ok. All objects appear and nothing is missingWhen I export the same sheet with the same view but this time with scale 1:500 some elements went missing. Probably in the export process Revit omits small object (I guess)I've attached two screenshots to illustrate the problem.Do you have any idea what could be the problem and how to solve it. Is there some kind of a setting which controls the precision/scale thing.Thanks guys!
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Joined: Tue, May 16, 2006
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There is no problem here. When lines are too small, Revit will not display them. That is really not a problem. Just because you can zoom in and see them in CAD desn't mean they need to be there.
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Are you seriuos about what you've just written?!
It is not normal. They are part of the project and they HAVE to be there. This way Revit makes my drawing inaccurate.
After all it is exporting to DWG file - it has to be 100000% the same as the model in Revit.
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We are talking about different issues her. Revit is very accurate! Revit is not CAD and does not work the same way and never should. When you export to CAD, you are creating a 2D document and Revi's 2D rules apply. Here is an explanation from your HELP>
"Adjust the view scale to control the precision/performance ratio.
When you export to 2D DWG or DXF, you export a scaled 2D view of the model. The view scale you apply determines whether the resulting view is exported for precision or for performance. For example, if your model contains 2 lines that are 1/4" apart and the view scale is 100, the lines will be considered to be within tolerance, and the exported DWG will contain a single line (exported for performance). If the view scale is 20, the exported DWG will contain separate lines (exported for precision)."
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How can I choose the precision or the performance? Why Revit decide it itselfs?
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You haven't told us why this is a problem for you. If you want to modify the DWG in CAD views at a larger scale, then export at that scale. If you ever hand drafted, you would understand that 2D linework is dependent on view scale. Two lines drawn 1" apart at 1/16"=1'-0" results in one line! Computers distort the way you think about this because you can zoom in.
Revit is much better than CAD in our fields because it is model based and accurate to 1/256". But it works completely different than CAD. Revit works more with vectors wheras lines in CAD have x/y/z endpoints descriped to the .xxxxx? precision. Because of that, "parallel" lines in CAD may not be parallel in Revit. This 'inaccuracy' causes problems for users that import CAD and try to dimension it. Revit is more concerned about vectors but the x/y/z of the vector endpoints will only be as precise as Revit's limits.
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Hello,
I've been working both with ArchiCAD and Revit for years now. ArchiCAD never omits any data no matter of the scale you are exporting to. After all you are exporting to another vector program. It’s okay if Revit omits date during this performance-precision thing but only when you are exporting to pdf or you are printing directly (just because you physically won't be able to see this small object or it will be printed like a small black dot). But when you are transferring information from Revit to AutoCAD file format it sound a little bit strange the program to determine what you will or won’t see.
What would you do if you have for example one big industrial building – 200 x 450 meters? This building will fit to A0 only if the scale is 1:500. Then the client want the whole building in .DWG and the only way to export a proper version of your model (which contains everything you and your team have drawn with every tiny detail in it) is to make another view with scale 1:100 because this way Revit won’t omit information.
It’s ridiculous ... don’t you think?
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Joined: Tue, May 16, 2006
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thunderwidth,
If you want the whole building then export it as a model view which is full scale! That is how Revit really works - full scale. VIEWS are just views and you can set those up in CAD at any scale, just like you do in Revit.
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Finaly, I found out a solution. The problem was that in family, in visability, the Coarse was not ticked. As far as I ticked it, everything is ok.
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Thanks for reposting.
Revit is a complicated program and with some user issues, we can't always point to what may be causing a problem for the user because we just don't have all of the information. I would have never come up with this being a family issue from your original question. My assumption was the missing linework was there and not being exported but now we know it wasn't there....
A good learning experience for all that may read this post.
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