Calculating area moments of inertia in Rhinoscript (now with files)

@pim_meester wrote:

Hi!

I’m not getting the same calculation results on my script that uses Rhino.SurfaceAreaMoments and Analyze > Mass Properties > Area Moments. I need the moments of inertia about the centroid coordinate axes. I’ve calculated the moments of inertia by hand and I’m sure that my code result is wrong haha. Does anyone see what I’m missing?

My code looks like this:

surfaces = Rhino.SelectedObjects

If IsArray(surfaces) Then
			For Each surface In surfaces
					inertias = Rhino.SurfaceAreaMoments(surface)

					If IsArray(inertias) Then
						Rhino.Print	Rhino.Pt2Str(inertias(10), 0)
				
		End If
	Next
	
End If

I’ve attached a Rhino file with the surfaces and a pdf with my calculation. The text is in Dutch but the numbers and calculations are clear.

Thanks in advance!

Rhino Testmodel 0 meting.3dm (119.8 KB) Calculation moments of inertia about centrooid axes.pdf (252.5 KB)

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