CAD tip # 1183:

Question

CAD

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How to get the center gravity of an area?

Convert your area (e.g. an irregular shape or a polygon) to a region (with the REGION command) and then use the MASSPROP command on that region. You will find the center of gravity and moment of inertia of this zero-thickness body. Before MASSPROP you may need to switch the UCS to that object (UCS New Object).

You can use the geometric calculator - enter the POINT command and on the coordinates prompt ender 'CAL. As an expression, enter (end+end+end)/3 (for triangle) or e.g. (end+end+end+end+end)/5 (pentagon) and click the individual vertices.

Alternatively, Autodesk Map 3D offers direct centroid-related functions.

See also the osnap mode "geometric center".

ACADACLTMap

*CAD

28.3.2001 90973× FAQ

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applies to: AutoCAD · AutoCAD LT · AutoCAD Map 3D ·

See also:
Tip 14461:	How to convert multiline geometry to a standard polyline?
Tip 14380:	Stereoscopic camera and anaglyphs in Autodesk 3ds Max.
Tip 14098:	How to use arc length parameter in Inventor sketch?
Tip 14088:	3 methods of creating true rectangles in AutoCAD.
Tip 14027:	3D heart from the heart.

Selected tip: How to move (flatten) entities with varying Z-coordinates to Z=0?

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