topic Re: Are rooms supposed to be selectable through levels? Video and file inside. in Revit Architecture Forum

Are rooms supposed to be selectable through levels? Video and file inside.

winstonfoxnelson — Thu, 25 Jan 2018 06:38:11 GMT

Hey, the video explains it all (1:36). Also see attached drawing.

https://www.youtube.com/watch?v=_EmbFEB6GaU

I'm sure I'm just missing something, but I don't see a solution here.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

ToanDN — Thu, 25 Jan 2018 07:06:19 GMT

Your rooms are poking through level that's why. Either change their height or set to Volume + Area so that they pick up the bounding elements above.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

bimscape — Thu, 25 Jan 2018 09:16:24 GMT

Doesn't make a lot of difference in a small model- but as a general rule.....

Only compute Volumes if you really need to (ie you are going to do something with that data)- otherwise, just set it to Plan Areas.

You'll apppreciatre that there's (potentially, in large model) a lot more work for your hardware to do if it's having to calculate the 3D volume of each Revit Room / Space.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

ToanDN — Thu, 25 Jan 2018 10:01:52 GMT

The options were created decades ago. Hardware have come such a long way to have to be bother by some legacy radio buttons.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

loboarch — Thu, 25 Jan 2018 13:30:01 GMT

@ToanDN wrote:

The options were created decades ago.

Maybe not DECADES ago. Actually I was talking about this with the developer who worked on room volumes recently and we decided it was 10 years ago. I had mentioned a presentation she gave while developing it and then she promptly produced the Power Point slide deck.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

chrisplyler — Thu, 25 Jan 2018 13:46:02 GMT

I don't understand why volume calculations would be very processor heavy. It's just one more multiplication step. Modern computers could calculate the volume for a thousand rooms in a tenth of a second.

Unless Revit sits there CONTINUOUSLY recalculating them all the time. It doesn't do that, right? It does it once and records the values, and only recalculates when a room dimension changes, right? Please tell me it wasn't programmed to continuously recalculate them all the time.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

loboarch — Thu, 25 Jan 2018 13:53:35 GMT

@chrisplyler wrote:

Unless Revit sits there CONTINUOUSLY recalculating them all the time. It doesn't do that, right? It does it once and records the values, and only recalculates when a room dimension changes, right? Please tell me it wasn't programmed to continuously recalculate them all the time.

This is NOT how parametric equations in Revit work. If you change one thing in the model, even a thing you and I know has no effect on any other thing in the model, Revit has to run EVERY calculation for the ENTIRE model again to check the integrity of the model. That is how parametric equations in Revit work (as far as I have been told).

So yes, the rooms are "constantly" recalculated every time you make ANY change to the model.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

chrisplyler — Thu, 25 Jan 2018 14:13:53 GMT

Okay, I get why that logic needs to exist for a lot of relationships.

But also it DOESN'T need to exist for a lot of relationships.

In the same way that the graphics card doesn't need to recalculate/redraw the screen if you havn't moved your cursor or anything, there isn't a logical reason that Revit NEEDS to recalculate EVERYTHING all the time.

It doesn't recalculate duct/pipe sizing continuously, for example.

Re: Are rooms supposed to be selectable through levels? Video and file inside.

loboarch — Thu, 25 Jan 2018 14:20:24 GMT

@chrisplyler wrote:

Okay, I get why that logic needs to exist for a lot of relationships.

But also it DOESN'T need to exist for a lot of relationships.

In the same way that the graphics card doesn't need to recalculate/redraw the screen if you havn't moved your cursor or anything, there isn't a logical reason that Revit NEEDS to recalculate EVERYTHING all the time.

Software development logic, math, and all of that stuff is above my pay grade. I assume they know what they are doing.

"Un-linking" things from the parametric change engine in Revit is difficult. It is the price you pay for "always updated". There are a few things that have been "decoupled" from the parametric change system in Revit for performance reasons. Some of the MEP calculations are like this. View regeneration was decoupled a few releases ago I think? (Revit used to regenerate EVERY view of the model even one that were not currently open, now it only regenerates open views, I think.) There are a few other things here and there, but it is spotty and it is difficult to do.