CAD tip # 5303:

Question CAD
% platform category

Cannot draw perpendicular to some Arcs.

If you use rotated UCS or if you export DWG from some vertical applications (like Civil3D or ADT), some right-hand arcs may be represented with a switched normal (rotated normal vector [X,Y,Z]=[0,0,-1]). With such "backside" arcs you cannot e.g. draw perpendicular lines (PER osnap) or you may find othe problems.

To normalize such arc to the standard format (normal vector [0,0,1]), you can use the free LISP utility - Xanadu ArcNorm - for dowwnload on Download (load it by APPLOAD, start it by ARCNORM). This command selects all switched arcs and make their direction normal (without visual changes in the DWG file).

CivilADTACAD

* CAD

6.12.2006 9444×

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applies to: Civil 3D · AutoCAD Architecture · AutoCAD ·

See also:
Tip 7341:	How to scan all DWG drawings for missing SHX files?
Tip 6933:	How to show history of drawing entities?
Tip 6724:	Automatically generated picture-legend of drawing blocks.
Tip 6598:	How to detect all DWG files containing Xrefs?
Tip 6146:	How to detect DWG files containing VBA macros?

Selected tip: How to create a dormer in Revit?

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