Export to DWG - small objects missing

[jiri.drahotusky]

Hi,

I'm using Revit 2016/2018. I have an issue with exporting small objects  (about 50 mm - Structural Columns, Walls, Generic models, Curtain Wall Mullions, etc...). When I export to DWG view with a view scale of 1:100, everything is ok. All objects appear and nothing is missing. When I export the same the view but this time with scale 1:200 or higher, some elements went missing. Probably in the export process Revit omits small object.

Do you have any solution or workaround, for example by changing some undocumented system variables in Revit.ini?

Jiri

[ToanDN]

I've gotten the same result so bumping this topic.

[pawel.romaniuk]

Hi @jiri.drahotusky 

Hi @ToanDN

Have you tried as workaround to put some not visible elements inside Revit Family?

[jiri.drahotusky]

Hi Pawel.

Yes, I tried it.

For example, an invisible circle with a radius of about 100 mm. It's works, but this will only help with one family, in this case a steel collumn. The same problem is with the mullions the curtain wall. I can not imagine that I would have to repair hundreds of families because of this behavior. In addition, the same problem is with the wall object if it has a thickness and a length of up to 50 mm (as an auxiliary structure).

See RVT + DWG sample.

[pawel.romaniuk]

Hi @jiri.drahotusky

Placing additional not visible elements inside Revit families helps for Structure Columns:

Scale 1:100

 

1:200

Unfortunately it doesn't work for Curtain Wall Mullions - i will investigate this issue.

@jiri.drahotusky Please take o look on 

Help: Create a Legend

[jiri.drahotusky]

Yes, I know about the insertion of an invisible elements into family. But as I have already written, it is not the system to modify in project all the families smaller than about 50 mm. I expect that all objects to be exported during export to vector data (regardless of the scale). Object disappearance would be understandable when printing, where the line thickness also plays a role.

If this Revit behavior is programmed, I will wait for some better system solution.

Jiri

[Anonymous]

Hello everybody,

I'm experiencing the same problem exporting a curtain wall. I solved exporting in 1:1 scale, unfortunately the hatch follow the scale.

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@jiri.drahotusky wrote:

Hi,

I'm using Revit 2016/2018. I have an issue with exporting small objects  (about 50 mm - Structural Columns, Walls, Generic models, Curtain Wall Mullions, etc...). When I export to DWG view with a view scale of 1:100, everything is ok. All objects appear and nothing is missing. When I export the same the view but this time with scale 1:200 or higher, some elements went missing. Probably in the export process Revit omits small object.

Do you have any solution or workaround, for example by changing some undocumented system variables in Revit.ini?

Jiri

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[ToanDN]

@Anonymous

I've found that model elements smaller than 50 mm disappear when export from a 1:200 view, but detail elements of the same small size remain.  Not sure how it helps for your specific situation.

[jiri.drahotusky]

Hi,

thank you for your answer. With an invisible outline, this is a partial solution. The problem will still be with system families (wall, mullions...).  Jiri

[RobDraw]

You solved your own problem. Export model elements 1:1.

There are always going to be some adjustments when exporting. IMO, if exporting to smaller scales makes objects disappear, don't do it. Annotation objects, like hatches, can be dealt with in another fashion.

[Anonymous · Accepted solution]

A workaround for this:

Go to a 3D view in your Revit file. 

If possible, adjust the visibility setting so that just the missing objects that you need are visible in view.

Export from the 3D view to a dwg/dxf (we'll call this "File 2").

Edit File 2 so that it just contains the parts that are missing from your original dwg/dxf (File 1).

Use the "FLATTEN" command in File 2 to convert the 3D elements to 2D.

Copy and paste the items from File 2 to File 1.

Please mark this as a solution if it works for you.

Thank you.

[jiri.drahotusky]

This is an interesting solution and can save missing objects.

For small drawings, this is useful, with large drawings taking a lot of time.
Thanks for the tip

[lmorales]

We have noticed this happening recently as well (Revit 2018.3, and Revit 2019.x) - if you are able to change the view scale to 1:1 just for the DWG export, it tends to eliminate the issue.