CAD tip # 7916:

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Searching for hatches with missing Area property.

AutoCAD drawings may contain hatches which - mostly due to the loss of associativity - do not have the "Area" property and so you cannot use them to summarize the total area. For area calculations you will need to fix them first - reconstruct their boundary curve and re-create the hatch. Such hatches typically come from Microstation.

To identify such complaining hatches, we made a LISP utility SelHatch0 - it selects all hatches that do not contain the property Area - so e.g. the Properties windows doesn't display the area of such hatch object. The command DelHatch0 then allow to bulk-delete such "null" hatches.

You can download the SelHatch0 utility from Download, load it with APPLOAD and run it with the command SELHATCH0 or DELHATCH0. The complaining hatches will be pre-selected for editing.

If you only have AutoCAD LT (<2024) and cannot use the LISP utility, the selection filtering will help. Use the QSELECT command, use the "Select Objects" button to select all objects in the drawing (by window), select Hatches as the Object Type, select the Area property, and as a criteria, specify "Is greater than" value 0. Click "Remove from new selection set". After confirming the dialog, you will be left with the selected hatches that do not show Area.

ACADACLTADTACADMPlantMapCivil3D

*CAD

15.4.2011 20304×

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applies to: AutoCAD · AutoCAD LT · AutoCAD Architecture · AutoCAD Mechanical · AutoCAD Plant 3D · AutoCAD Map 3D · Civil 3D 3D ·

See also:
Tip 13960:	Fermat's spiral in AutoCAD.
Tip 13788:	Green square - mathematical charade and parametric constraints in AutoCAD.
Tip 13150:	How to hatch selected objects including overlays and islands?
Tip 12633:	Sol2SolH - convert DWG objects of the type Solid to Hatches
Tip 12429:	HatchOverlap - check for any overlapping hatches in a DWG

Selected tip: Using expressions in AutoCAD dialog boxes.

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