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Each day, we address a staggering number of technical support issues that are the direct result of drawing corruption. Though not a virus per se, corruption in a DWG certainly acts like one, causing poor performance and even the loss of valuable work.
What is drawing corruption? Find out by visiting our Drawing Corruption Explained page.
Fortunately for you, drawing corruption is highly preventable. We highly recommend implementing the steps on this page as an office standard for any drawing anybody in your office receives and opens. Here's how to keep your drawings safe by preventing corruption:
The first and perhaps most important process to incorporate is to separate your sheets out into different DWG files. You undoubtedly already do this for drawings you receive from other firms or consultants such as survey, engineering, and architecture plans (if you don't, you should). But you should also follow the same practice for your own drawings, as well as drawings you receive from colleagues within your own firm. This can include planting, irrigation, and hardscape plans – all of which should be in separate drawings.
Keeping each sheet in a separate drawing is basic insurance against the spreading of drawing corruption. If one of these drawings becomes corrupted, the problem will be isolated to that drawing rather than dispensed across all your other drawings. You can then address the issue in that one drawing without running the risk of losing the rest.
Setting up your sheets correctly will require a few minutes of preparation, which pales in comparison with the hours or days of work you can potentially lose if your entire drawing set succumbs to corruption. For more information and specific instructions, see our sheet setup webinars:
AutoCAD has a built-in detector of Proxy Objects – the root of drawing corruption. It's called the Proxy Information dialog box. We highly, highly recommend enabling this dialog box. With Proxy Information enabled, you'll be able to determine whether a drawing is corrupt right when you open it, which will in turn allow you to do something about it.
You can enable Proxy Information in the CAD Options dialog box, under the Open and Save tab.
In fact, we highly recommend the following settings within the Open and Save tab:
When the Proxy Information dialog box is enabled, it will pop up as soon as you open a corrupt drawing.
The Proxy Information dialog box lists all potentially damaging elements in the drawing you open. You can scroll down using the scroll bar to see how many Proxy Objects the drawing contains.
In this example, the Proxy Information dialog box is showing that a drawing contains 2,447 Proxy Objects from AutoCAD Civil 3D – not a good thing, but definitely a good thing to know.
In all these cases, you won't even be able to see the Proxy Object. It's not adding anything to the drawing; it's just information that you can't even access or use, but it's clogging up your file.
This is the crucial step in the process of preventing drawing corruption. There's no other way around it: If you're not practicing drawing cleanup, you should be.
Cleaning your drawings, or drawing cleanup, has become an imperative step in designing with CAD. It involves locating, isolating, and getting rid of the Proxy Objects, RegApps, DGN linetypes, and other contaminants that cause drawing corruption. We've put some major effort into developing a standard cleanup process for all CAD users, including our Nuke tool.
To clean your drawing, follow our drawing cleanup steps.
If you start a blank drawing or base a new drawing off of a template that you know is clean, you won't need to clean that drawing. The same goes for drawings you receive from within your firm that you know are clean. How do you know if a drawing is clean? You enable the Proxy Information dialog box. Once enabled, this dialog box will pop up in any drawing that contains Proxy Objects. If so, it's time to Nuke!
Here are the drawings you should absolutely clean without question:
As you likely know, landscape and irrigation designers receive a lot of drawing files. At the very least, you probably receive separate drawings for survey, engineering, and architecture for each site you design. These drawings will usually all originate from different firms and different versions of CAD. As a result, they will undoubtedly contain Proxy Objects. You'll know this because you've enabled the Proxy Information dialog box and it lists them.
But really, you should assume any drawing you receive from outside your firm contains some of the bad stuff that causes corruption. You really have nothing to lose; just clean these drawings as soon as you open them.
Even drawings from within your firm – and your own drawings – can become corrupt as they're passed around between designers and/or other firms. If you open any drawing – regardless of where it originated – check the Proxy Information dialog box. If it shows Proxy Objects, it's time to clean the drawing.
Once you're sure all necessary sheets are in separate – and clean – drawings, you can safely Xref them into your main drawing. Haven't used Xrefs before? Think of them as separate sheets of tracing paper, each with a separate set of linework and objects (in the form of CAD blocks) that you lay over each other. Your main drawing will include Xrefs of the survey, engineering, architectural, planting, hardscape, irrigation, and any other sheets you need to reference.
Once you've cleaned your sheets and Xrefed them into your drawing, you'll still need to run the Purge and Audit commands periodically on your working drawings in order to keep them clean.
We have a command-line shortcut for Purge – just type PRG to do a quick multi-purge to an open drawing. This command will remove unused objects and definitions.
An Audit does exactly what the Recover command does – just once the file is already open. There is no harm in running an Audit often. We recommend doing it weekly. Simply type Audit in the Command line and follow the prompts.
When an Audit discovers errors in a drawing, it's imperative to address them – just as you would take some action if your software discovered a virus. For instance, what was the process in creating the file, how many revisions did it undergo, were there multiple Copy/Pastes across drawings, and so on.
If you send you drawing to a client, another firm, or even a colleague for review or modifications, it can become corrupt again – even if you've already cleaned it.
Why does this happen? Because certain Proxy Objects spread through drawings not only through Xrefs but simply by having a corrupt drawing open at the same time as another drawing. That's why, when you receive a file from someone else, we recommend not having any other files open when you open and clean it. This practice will reduce the spread of Proxy Objects from drawings you receive.
If your drawing comes back to you from someone else, check the Proxy Information dialog box to see whether the drawing has indeed become corrupt. If it indeed contains Proxy Objects, DGN Linetypes, RegApps, etc., it's time to clean it again. This means:
This process may seem tedious, but in reality it only takes a few minutes – a small price to pay for the reassurance that your drawing won't become corrupt and unusable.