Find weight of metal content

[aubergine2001]

I am trying to write a script that;
finds volume of object.
then takes that volume that is in model units. (cubic millimetres for me)
converts cubic millimetres to cubic centimetres
takes cubic centimetres and multiplies by specific gravity of metal (925 silver most of the time). Though maybe a pull-down to choose if I need gold or other jewellery metals.
Then print out the weight.

I have started a basic script, but I get an error "can't multiply sequence by non-int of type 'float'".

Any suggestions,

Thanks in advance,
Randy

[Steve Baer]

Hi Randy,
SurfaceVolume returns two numbers (volume and error bound). Here's what I would do to adjust your script

Python Code:

"""Rhino script for finding weight of object"""
import rhinoscriptsyntax as rs
 
def GetWeight():
    obj=rs.GetObjects("Select Objects for volume")
    massprop = rs.SurfaceVolume(obj)
    if not massprop: return
    volume, error = massprop
    centimeters = volume * 100
    weight = centimeters * 10.3
    print "The polysurface weight for 925 is:", weight
 
GetWeight()