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CAD tip CAD tip # 5688:

Question CAD 
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Q - question

Where do the layers like "Layer @ 10" or "Layer @ 16" come from?
A - answer When you save a DWG drawing from AutoCAD 2008 to an older version and this drawing contains annotation type objects (with automatic scaling), AutoCAD may convert these objects to separate objects divided into individual layers by the viewport scales used.

This conversion is controlled by the "Maintain visual fidelity for annotative objects" in the Options dialog, the "Open & Save" tab (see also the VISUALFIDELITY variable). In an older version of AutoCAD, these divided objects are stored in generated layers with the " @ given_scale" suffix.

It is recommended to switch off this option for drawings without layout viewports or annotative objects.

ACAD2008ACAD2007ACAD2006ACAD2000
100% *  CAD 
3.8.2007    9987×  
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applies to: AutoCAD 2008 · AutoCAD 2007 · AutoCAD 2006 · AutoCAD 2000 ·

See also:
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Tip 12184:Overview of CAD formats supported in Inventor 2020 (import/export/AnyCAD).
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