Centroid Caluclation of irregular footprint?

[archjake]

Do we have any tools in Revit or easily accessible with Revit to help us calculate centroids of 2D elements? I have 3 separate irregular footprints and need to find the centroid location. I am hoping we have some tools at hand so I don't have to do all the math / geometry.

At first I was hoping to draw a filled region and use the rotate tool to approximate this location but it appears that the origin of the rotate tool on a filled region is not weighted by its shape, rather its extents.

Thanks,

[trombe]

Hi Jake,

no Revit does not have an easy way to do this (yet)
Check here for some extra notes:
http://www.mamikon.com/USArticles/EasyCentroids.pdf
http://www.youtube.com/watch?v=DGJvFoOGHdc&feature=youtube_gdata
trombe

[gordolake]

Ahh good old autocad.

export shapes to autocad

1. convert polyline to region
2. massprop

Area: 1208.5832
Perimeter: 230.1657
Bounding box: X: 28.2120 -- 83.0796
Y: 8.0455 -- 45.5972
Centroid: X: 58.1061
Y: 26.8472
Moments of inertia: X: 976891.3672
Y: 4314710.4290
Product of inertia: XY: 1887208.9652
Radii of gyration: X: 28.4305
Y: 59.7500
Principal moments and X-Y directions about centroid:
I: 105752.5639 along [0.9999 0.0143]
J: 234175.7255 along [-0.0143 0.9999]

[archjake]

I was afraid of the o'l Autocad required. Thanks for the links and info.

It's too bad that we don't have a slew of analysis tools available for Revit; even 2D ones like autocad will spit out results. We'll eventually get there but in the mean time I get to kill another 5 to 50 minutes to figure out my initial centroid and then proceed through design and I may have to relocate it again.