Property lines changed in dwg imports!

[MRV]

I just imported a survey dwg file into my project, and two of the four property lines in the import were changed, from a bearing of N89 57 56W to N90W !!! These were not native Revit lines, but the property lines in the dwg file! This is a huge issue for us, for now we can't rely on the surveyor's dwg files to import into Revit!

Unfortunately this is a limitation with Revit - if the program encounters a line that is almost horizontal, it will make it exactly horizontal. Unfortunately there is no way to modify the precision of imported lines. Development is aware of this issue and they are looking at ways to improve this functionality in future releases. The only workaround, at this point, is to break the line up into smaller segments. Revit will still adjust the lines, but the changes will be less noticeable.

I've always believed that I could trust the import dwg files to be correct, but now I found out that Revit is changing the entity coordinates, and you have no way to know what is changed!!!

[tomnewsom]

O_O !!!!

This is unforgiveable behaviour! Fix it now now now please, autodesk.

[chodosh]

...Unfortunately this is a limitation with Revit - if the program encounters a line that is almost horizontal, it will make it exactly horizontal...

This goes hand in hand with warnings that your "line is slightly off-axis and may cause inaccuracies." Same behvior trend. I have heard of the same issue with arcs created by a trigonometric formula in a family parameter on a very large job...

-LC

[Liz437]

Absolutely unforgiveable!! We have a very large slightly curved building, and generate over 2000 (yes, that’s OVER 2000!!) warnings in each model of ‘line is slightly off axis’ which we can’t get rid of & simply bloat our model. Everyone does not build or design at 90*. This is, for us, a serious problem and deserves some correction. There is no reason that a line ‘slightly off’ vertical or horizontal should generate a problem.

[chodosh]

Over 2000 just for "line is slightly off axis???" How many lines are being corrected, then, if there are that many warnings? Do you see similar things to what MRV originally posted that the lines were auto-correcting to due horizontal?

[Liz437]

Yep, we have an average of around 2000 warnings per project file just of ‘line slightly off axis.’ With 13 project files linking into one another to create the one model you can see where our performance suffers. Nothing we can do about "slightly off axis" other than delete, which, obviously, is not an option, as that would delete essentially our entire project.

The 'break into smaller segments' makes zero sense in our case, as lines would continue to be 'slightly off axis.' We have seen some auto-correct, but really have a very hard time keeping track of those occurrences.