Just discovered this last week from a project which the accuracy is set to the highest. I used to rely on Revit’s precision and trust the dimensions Revit gives me. The elements were drawn exact. I can set the precision with rounding 0 decimal places.
If I reset the precision to 12 decimal places (maximum Revit can allow), I expect Revit will give dimensions exactly as before with 12 zero after the decimal point. However I am disappointed that Revit is giving the wrong values.
OK. Let’s reset the precision with rounding 11 decimal places.
Everything is back to normal. Now I have learned a lesson. Don’t be a precision freak!
Also Steve Stafford has written something about this in his Revitoped blog. Thanks Steve for sharing. http://revitoped.blogspot.com/2014/01/accuracy.html