Hi Brian, yup that is actually what I try to do when possible....

That's why there are a variety of custom plugins on Petr's page here: http://kyticka.webzdarma.cz/3d/moi/ - those were added as plugins to provide some useful functions to MoI for specific things, but without having an impact on the regular UI.

Probably a weight calculation could be added in a similar way, like a plugin that does a volume calculation but also has a list of different materials so you can get the weight easily.

But really it is not a very difficult thing to get the weight once you have the volume - it just takes one multiply to get it.

- Michael