Issue - Overlaid DWGs not displaying properly.

[robert.sanders]

Hi, i'm currently working on a project where the Architect is using Microstation and we're doing the structure in Revit 2008 (20070404_1700).

For some reason when i overlay the dwgs the lines aren't displaying in their correct positions and appear fragmented. That's to say that they are actually in the correct location (ie When 'Picking' lines they display in a different(correct) position to what the overlay is displaying). I've included an image below that shows the arch overlay in red and the 'picked' lines in white.

I've tried, exploding, auditing, purging, wblock and a few other methods but haven't had any luck at all. Has anyone else come across this problem? Any possible solutions? I'm waiting to recieve the original dgns as the arch sends them out already converted to dwg. Possibly it's some export setting?

Anyway, anyway help would be muchly appreciated.

Thanks

Robert Sanders.

Ps forgot to say that none of the lines displayed below are complex polylines or anything like that, they're just straight up pure and simple circles. (circles seems to be the most effected).

[robert.sanders]

*bump?*

anyone?

[Phil Palmer]

It could be due to the Revit origin being miles away from where it actually should be.
We have experienced that before where a user had imported the dwg files with their origin miles away from where revit likes it. He then had similar issues with selecting dwg underlay graohics for picking or snapping to.

[Jshaver]

I have seen this issue afew times and I feel that it is a bug in Revit.
In my experience I have found that Revits tolerance is to blame. If the AutoCad lines are not 100% vertical Revit Autocorrects them upon importing. This is very problematic especially when trying to layout grids. I was getting a similar effect when zooming in/out in views where the cad import was present. The lines seamed to shift back and fourth. Binding and exploding did help some but when Revit straightens out elements the imported file is no longer accurate.

I.E. if the arch grids are off .01 degrees revit will straighten the grids but not correct the column/wall locations.

[dbaldacchino]

Does this happen on other PCs too? Could be a display driver or other driver issue.

One time someone installed a bluetooth mouse and driver and Revit wwent haywire. You would select something and the highlighted object would appear some distance away. We uninstalled the driver and it returned to normal. Let us know if it's a specific issue happening on one PC only or all.

[dhurtubise]

I would go the drivers way. It looks more like a display isue. Try turning OpenGl on or off. Maybe even Overlay Planes.
You will find those under Settings Options

[david_peterson]

My guess is the origin of the Acad file. If you more that say 1000' from 0,0 it won't look right and nothing will line up. Put the corner of the acad file at 0,0 and you'll be fine. It's a pain, and kinda sucks you can't do campus master plans. I tried inserting one once and I couldn't get anything to line up.