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Saturday, May 20, 2006

Export to DWG Known Issues

This is a compiled list of DWG export problems. Hopefully this list will see some of these issues ironed out in subsequent releases. If you have any further issues that you think should be listed or comments on how some of these issues have effected your productively please post them.

1. Elements that have used the linework tool on certain category families do not get exported.

2. When the linework tool is used on an underlay to show the roof and the underlay is turned off, in the resulting export the roof hatch is typically exported also...

3. White, no pattern fills created in annotation families or any family for that matter export to AutoCAD and print as solid black making the annotations unreadable. FIXED

4. Elements in sub-categories are not exported to their subcategories even though they have been mapped to a seperate layer in the export layers file. THIS ISSUE HAS BEEN RESOLVED WITH A LATER BUILD OF REVIT. ELEMENTS ARE STILL EXPORTED TO THEIR CATEGORY LAYER AS BLOCKS, HOWEVER PARTS OF THESE BLOCKS CAN BE TURNED OFF USING THE SUBCATEGORIES. FIXED

5. Crop Region translations when exporting sheets directly correspond to those in Revit. The issue being is that an AutoCAD viewport crops text and annotations where is Revits doesn't...

6. When Override host layers is enabled for walls etc, the resulting export places these lines using an unpredictable color which doesn't correspond with the export layers file. Typically Color 10 or Color 50 so these need to be assigned in your CTB file.

7. Dimension and text should create new styles upon export rather than using the STANDARD style as this creates issues with older versions of AutoCAD commonly used by clients and consultants.

8. When loaded generic models are used as an in-place floor when a callout of them is exported the entire floor comes across in the result export. This is an issue as if the setting is used to export out to a single sheet often this floor then overlaps the other details on the sheet making them appear incorrectly.

9. Linetype translations are still unpredictable. Often the linetypes used in revit don't translate through into the export. A solid line is the result. For instance overrides applied using a filter to select specific wall types to display in a particular manner.

10. The penultimate would be for an exported titleblock to export with attributes created for the parameters. Some of our clients have database systems they use for managing drawings (checking in and out etc) that link with these attributes. As the various consultants do not currently use Revit the only deliverables are DWG and DWF/PDF. As such these resultant exports need to be perfect and useable in order to work appropriately within a system such as this.

11. Text leaders somtimes get exported with an uncontrollable overridden color. Color 10 or Color 50...

Feel free to add comments

10 comments:

David Duarte said...

the PCP file should reflect Revit’s lineweights EXACTLY

And it should support special characters (like stacked fractions). Right now if you export to dwg, stacked fractions (and the text they share a block with) get erased.

Chris said...

Interesting, I've never even tried to use the PCP file and always considered it pretty much useless...

But good point.

David Duarte said...

At the moment it is useless. If we could generate a useful CTB file from the given PCP file then our consultants could plot Revit generated DWG files that look like a Revit product, but the linewieghts (and other factors) don't translate right yet.

Rusty Gesner said...

We've tried converting the PCP to CTB and the lineweights come out correctly, but all the colors plot in greyscale (translated colors)even when I edit the CTB file and set them to black (setting it up similarly to our standard CTB files) all settings.

Chad Smith said...

There are also still issues with some linework not exporting from elevation views.
And in plan views, fill patterns (in particular on roofs) sometimes get exported when they aren't visible.

Chris said...

I find the roof patterns get exported when you've used the linework tool on the roof to show it dashed over... Its rather annoying.

If you spend the time continually resolving your layers export file in revit and set it up to match your lineweights and styles for your office standard ctb file you can get a pretty good print that gets close to matching the revit print.

I do find however that ever now and again you'll get a strange colour exported to a line, this is usually because its not defined in the layers export file and needs to be added.

HTH.

Anonymous said...

3. White, no pattern fills created in annotation families or any family for that matter export to AutoCAD and print as solid black making the annotations unreadable. FIXED

In relation to this - I am operating on Revit 9.1 and this problem still occurs. When I use a white solid filled region and export it to Cad it still shows as a solid fill that prints black.

Chris said...

Anonymous,

You just answered your own statement.

The devil is in the detail...

White "NO PATTERN" fills export and print fine.

White "SOLID FILL" fills export and print black.

HTH.

Anonymous said...

I can not find an option for NO Pattern, So I use Solid White fill, Transpartent and get a black box where my filled region is.

How do I get the No Pattern option

Chris said...

You need to use a masking region, not a filled region. A masking region is a solid white fill but its handled differently with exporting.