There are several areas of hidden data, hidden parameters and information deep in the DWG drawing database. And here are some methods how to dig out this data.
- The most obvious item - the geometry. Reveal hidden layers by thawing and enabling all layers (the LAYER command). Unhide hidden (isolated) objects by the UNISOLATEOBJECTS command.
- Hidden attributes - display hidden attributes in blocks by the ATTDISP command.
- Empty texts - some drawing contain texts with space-only characters. Such texts are not visible until you set the QTEXTMODE variable.
- Hidden face edges - 3DFaces with hidden edges can be revealed by setting the SPLFRAME variable to 1.
- Proxy objects - proxy objects from vertical versions of AutoCAD and AutoCAD add-ons without object enablers can be displayed by setting the PROXYSHOW variable
- Drawing tables - a DWG drawing does not contain only geometry but also non-graphical objects: styles, tables, linetypes, etc. You can list them e.g. through the VisualLisp IDE. Start the VLIDE command and use View > Browse drawing database.
- EED - Extended Entity Data - can contain valuable information. You can list the EED contents for any drawing object with the Express Tools command XDLIST.
- Hyperlinks - if you attach a link (URL) to a drawing object, you may want to show it again. Use the SHOWURLS command.
- Field relationships - you may have a number of dynamically linked texts (fields) reflecting properties of other objects (acreage, lengths, etc.). Use the FIELDLINK utility to draw temporary lines linking fields and their dependent objects (see www.cadstudio.cz/download)
- History - the history of a drawing is normally hidden - you cannot tell what was drawn first and what next. With the LISP utility "HISTORY" you can animate the history of your DWG drawing (see www.cadstudio.cz/download).
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