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Custom features can operate on composite parts but it is likely that if the 'set mass' custom feature does not allow them as a selection, then that feature is setting is accidentally filtering them out with the selection filter on the selection box in question. I think that feature has been around since before composite parts, so it's likely that it was just not possible to account for this at the time of its writing. If you post the link to that custom feature here, we can confirm and '@' the owner to see if they want to make a change.
https://cad.onshape.com/documents/46fe6ca7bf68dfd04e9eb944/v/38ff40aed7ca9768f1b452e3/e/77324e0deb6bcea7e091d0b6
Looks like this doc is private. If it is your document and you are writing the FeatureScript, you will just have to allow BodyType.COMPOSITE in your selection filter, and then when you want to pass this into some evaluation function, you should wrap the selection query like so:
assuming you just want to call the evaluation on the solid bodies contained by the composite part (remember composite parts can also contain sheets and curves).
If you would like us to look at your document please either make it public so we can see it and discuss on this forum, or contact support from the '?' menu of your part studio.
Actually added a solid to the part studio which took on the weight from catalog along with location. Quite handy when provided doc is STL or some other form that contains nothing but surfaces. Wanting the new feature to be included with composite part.
https://cad.onshape.com/documents/46fe6ca7bf68dfd04e9eb944/w/8bf3c5e4b8115f4ec334249d/e/77324e0deb6bcea7e091d0b6
https://cad.onshape.com/documents/18b35cfcf2c6cf5668830f90/w/15216769574e8a81c923173f/e/8542061b7f92df44aaba5399
A tip @glen_dewsbury :
You don't have to copy a document to use the custom feature it provides. It is actually worse to do so because you will not have the opportunity to take advantage of any of the changes made by the original feature author. You can just add this custom feature by going to the original document and pressing the '+ custom features' button at the top.
That being said, we can wait and see if Richard shows up and makes the adjustment mentioned above, otherwise I can walk you through the changes necessary to make in your copy.
Will wait for a bit and see if Richard shows up.
@Jake_Rosenfeld
I believe they are actually both copies of my own FeatureScript: https://cad.onshape.com/documents/3ca261a95938af152088fca8
I have just updated my own FeatureScript to allow BodyType.COMPOSITE
IR for AS/NZS 1100
HWM-Water Ltd
Does evVolume work correctly on a composite part if the part contains solids and surfaces though? See above my suggestion to flatten the composite and only take the solids.
It works perfectly!
According to evVolume's documentation, it doesn't error if there is anything apart from solids in the query. For example, it will still work if I give it a surface and solid part.
IR for AS/NZS 1100