AutoCAD 2010 :: MASSPROP Centroid Algorithum
May 29, 2012
What algorithum is used to determine the centroid when the MASSPROP command is used?
Example, a 3D polyhedra defined by vertices:
2466.0975 2739.0486 2185.3153
0 2013.2174 0
3146.7943 1560.0472 2185.3153
1785.4008 1560.0472 172.0979
3146.7943 1560.0472 172.0979
2466.0975 2739.0486 23.2646
MASSPROP returns the centroid (2466.098, 1957.774, 1153.603).
I have used a second method to determine the centroid writen in Matlab code
>> P = [2466.0975 2739.0486 2185.3153
0 2013.2174 0
3146.7943 1560.0472 2185.3153
1785.4008 1560.0472 172.0979
3146.7943 1560.0472 172.0979
[Code] .....
This uses 'The Quickhull Algorithm for Convex Hulls' and returns the centroid (2095.20268741281, 2084.74098328248, 837.825401397925). There is a massive difference.
I have attached the example polyhedra.
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[code].....
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