One of the biggest causes of Drawing Flattener to fail is "Extreme Coordinates" in the AutoCAD model. AutoCAD has problems doing some calculations as models move farther away from 0,0,0. This is because of limitations due to 32-bit systems. Errors produced by this may never even be noticed due to how AutoCAD handles these types of coordinates, but when throwing a tool such as Drawing Flattener on top of AutoCAD, the issues with "Extreme Coordinates" can come to light. From more informantion on other applications and how they are affected by this, go to the See Also section and review the "Large Coordinates Cause Model Instability Or Degraded Performance".
Using AutoCAD's 2006 through 2008, it is recommended to stay within about 100,000 or so from 0,0,0. It has been seen were a component is more then that distance away from 0,0,0 and still worked, but it is a good baseline. The most common issues to see in Drawing Flattener from this are the model failing to flatten, nothing from the model space appear, or the model appearing odd, such as at a different angle then what it should be. Using AutoCAD 2009, the range from 0,0,0 has been increased, but going out to the millions of units is usually still not recommended.
AutoPLANT V8i Drawing Flattener usually can get past the Extreme Coordinates issue. It has been changed a bit from the previous releases to actually take the viewport's model that it is flattening and temporarily move it closer to the 0,0,0 in model space. After it has flattened the viewport, it then moves the model back and goes to the next viewport. This has effectively decreased the issues brought about with Extreme Coordinates for Drawing Flattener, but it is only available for the V8i release.
Product TechNotes and FAQs
Plant TechNotes And FAQs
Large Coordinates Cause Model Instability Or Degraded Performance
Bentley Technical Support KnowledgeBase
Bentley LEARN Server
Bentley's Technical Support Group requests that you please confine any comments you have on this Wiki entry to this "Comments or Corrections?" section. THANK YOU!