Create a new weight instance
Position arguments:
shapes -- List of shapes of the weight
ship -- Ship owner
density -- Density of the object. 4 possibilities are considered here:
* Density as Mass/Volume: then the weight will be considered as a
volumetric object. Used for blocks or similar.
* Density as Mass/Area: then the weight will be considered as an area
element. Used for structural shells.
* Density as Mass/Length: then the weight will be cosidered as a linear
element. Used for linear structural reinforcements.
* Mass: Then a punctual mass will be considered. Used for complex
weights, like engines or other machines.
Returned value:
The new weight object
It is strongly recommended to pass just shapes matching with the provided
density, e.g. don't use volumetric shapes with a linear density value (kg/m)
The tool will claim the new weight as a child of the ship object. Please do
not remove the partner ship object before removing this new weight before.
