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# Thread: Mass Volume Vs Building Volume

1. ## Mass Volume Vs Building Volume

There's probably a fairly simple answer for this - but my brain's a little fried and I can't seem to work it out myself (for a friend).

Say you've got a mass, let's imagine one quite simple, a 10m x 10m x 10m cube. It's volume will report 1000m3. If we put a void in it, let's say 5m x 5m x 5m, the mass volume will be solid (1000m3) minus the void (125m3), or 875m3. Simple.

BUT.

How, with the voids modelled, can you find/schedule the volume entire of the mass again - to callout the "building volume" ?

I've had a scan read through THIS THREAD and forwarded it on to my friend for a late night read, but my efforts here (albeit slap-dash) to use solids as voids, or any of the other suggested methods, don't seem to get me where I want to be. For starters, the "voids" are internal, so I get the "one element is completely inside another" error.

I've looked at using visibility settings, but they don't appear to "do it" either. Type/instance based in the family change the volume - but that's not ideal, since it'd have to be one of those dirty switch on/off > schedule > print, then swith on/off > schedule > print workflows. And using the v/g (by view) of the sub-category doesn't affect the volume.

Unless I'm doing something really wrong?

2. I haven't tried this, and maybe I'm not understanding the question, but:
Can you schedule the voids and the mass, then just create a parameter with a simple formula to add them together??

I'm not even sure if voids are able to be scheduled. Just a thought.

3. Originally Posted by dzatto
I'm not even sure if voids are able to be scheduled
Doesn't look like they can be - and sub-categories don't work either.

Hmmm...

4. Originally Posted by snowyweston
Doesn't look like they can be - and sub-categories don't work either.

Hmmm...
Well...that was my little post referenced up there so I will chime in.

In your simple item above you can do the following:

1. Make a new Conceptual Mass family.
2. Make a new sub-category for your mass-as-voids
3. Make the 10M cube; let it remain a ‘Form’
4. Make the 5M cube and assign it to you new mass-as-void subcategory.
5. Use the 'Cut' tool to cut the 10M cube with the 5M cube.
6. Load the family into a project
7. Schedule the mass family for volume...the gross volume is the total volume of all masses in the family.

If you need to have the 10M cube carved down to make a building envelope do it carefully with real voids, or build it up out of multiple masses...then use the mass-as-void trick only for the voids that are contained entirely within the overall envelope (and will contribute to the overall volume number). This allows you to get the building mass to where you need it with non-schedulable voids, and allows you to have you interior voids as masses, which will still count toward the overall volume of the family. As an added bonus you can VV your new sub-subcategory but your schedule will still count it.

Unfortunately you will not be able to schedule the ‘parts’ (like just the 10M cube minus the 5M cube or the 5M cube on its own)...only both...which conveniently is the overall volume.

Hope this helps,
Drew

5. Originally Posted by The Dropper
Hope this helps
Cheers Drew, it certainly does/did, got it working now - not sure what I was doing wrong before (like I said my brain was fried on first posting) - and now I've got it working just the way (I think) my friend wanted!