How to get the combined space claim mass properties?

M

V2021R2

A customer recently requested the mass properties of selected bodies in SpaceClaim. Does anyone know a direct way to get this data?

M

And because this is StackOverflow, I can add my own (partial) answer. What I did was to grab all the bodies, copy them, combine them and get the properties of that new body, and then delete it.

bodyList = []
bodyProps = {}

def GETPROPS(body):
   """ function to get the required properties from a bodz"""
    x,y,z = body.Shape.GetExtremePoint(Direction.DirX,Direction.DirY,Direction.DirZ)
    vol = body.Shape.Volume
    bmp = body.MassProperties
    mass = bmp.Mass
    pax = body.MassProperties.PrincipleAxes.AxisX 
    principalMomentXAxis = body.MassProperties.GetMoment(pax)
    paxD = pax.Direction
    pay = body.MassProperties.PrincipleAxes.AxisY 
    principalMomentYAxis = body.MassProperties.GetMoment(pay)
    payD = pay.Direction
    paz = body.MassProperties.PrincipleAxes.AxisZ 
    principalMomentZAxis = body.MassProperties.GetMoment(paz)
    pazD = paz.Direction
    props = [vol,mass,principalMomentXAxis,paxD,principalMomentYAxis,payD,principalMomentZAxis,pazD]
    return props

def GETNEW(bodyList):
    """function to sort the lists when a new body is added to SC"""
    newlyCreated = []
    for body in GetRootPart().GetAllBodies():
        if body not in bodyList:
            newlyCreated.append(body)
    return newlyCreated

for body in GetRootPart().GetAllBodies():
    bodyName = body.GetName()
    bodyProps[bodyName] = GETPROPS(body)
    bodyList.append(body)

# copy all the bodyList bodies     
bodySelection = Selection.Create(bodyList)
result = Copy.Execute(Selection.Create(bodyList))

# Get the new bodies to a list
newlyCreated = GETNEW(bodyList)

# combine only these new bodies
targets = BodySelection.Create(newlyCreated)
result = Combine.Merge(targets)

# get the list of newly created bodies (should be 1)
newlyCreated = GETNEW(bodyList)

# Get properties of the body
bodyProps['Combined'] = GETPROPS(newlyCreated[0])

# remove body from SC
newlyCreated[0].Delete()

I am hoping there is a direct way. Perhaps if the parts are selected?

M

meister Mladenov to the rescue:

selection = BodySelection.Create(GetRootPart().Bodies)
massProps = MeasureHelper.GetMassProperties(selection)
mass = massProps.Mass

pax = massProps.PrincipleAxes.AxisX
pay = massProps.PrincipleAxes.AxisY
paz = massProps.PrincipleAxes.AxisZ

principalMomentXAxis = massProps.GetMoment(pax)
principalMomentYAxis = massProps.GetMoment(pay)
principalMomentZAxis = massProps.GetMoment(paz)

paxD = pax.Direction
payD = pay.Direction
pazD = paz.Direction

Erik Kostson

to add, in order to get the centre of volume:

 mp=body.MassProperties.RawSubject
 cen=mp.Center