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Forums >> Revit Structure >> Technical Support >> Question re: Model Performance vs modeling habits

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Thu, Jul 16, 2009 at 2:24:23 PM | Question re: Model Performance vs modeling habits

#1

structuresguy


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Ok, so I am modeling a 25 story tower that is all concrete walls, columns and slabs.  The bottom 3 stories are underground parking and storage/utility levels.  My rvt file is just under 30 MB.  The model has 930 walls, 262 floor elements, 106 column, 8 shaft openings, and 15 misc site features (plants, tress, furniture).

 

Now, when I go to move a wall, or fix it's end, or something else similar, it can take up to 20+ seconds to regenerate.  This is getting very frustrating.  This seems to be too slow given the size and complexity of the model.

 

My PC is a 3.4GZ quad core with 4 GB RAM and Nvidia Quadro FX1400 video card.  I have OpenGL enabled. 

 

So my question is how does the way I model things affect the performance?  Specifically, does joining geometry (say walls to slabs) affect the performance?  What about attaching walls/columns to slabs?  Also, what is the best way to model spanning elements (like columns and walls) in a high rise, from floor to floor, or full height?

 

I have created individual worksets for columns, walls, slabs, and other stuff.  Would closing different worksets make the regenerating faster?   What about making worksets for individual floors, or groups of floors, so that I could turn off entire levels of the building?

 

Any guidance you can give is much appreciated.

 

Thanks,

Andrew


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Thu, Jul 16, 2009 at 2:51:01 PM | Question re: Model Performance vs modeling habits

#2

WWHub


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Did you read this? http://scfiles.autodesk.com/sc/files/model_performance_technical_note_revit_2010.pdf?authId=1247524685_c0798bf46018b2aa7dfc23a282b49c0c

 

In addition, do you have other windows open and tiles or minimized?  Revit has to regenerate every active window.

 

Are you using shaded views?  They take more time to regenerate.

 

This is covered in the technical paper - have you paid attention  to your view depths?  They should only be as deep as they need to be so that Revit doesn't have to find everthing hidden.

 

Are you messing around with groups?

 

Worksets will not cause your problems.


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Thu, Jul 16, 2009 at 3:11:47 PM | Question re: Model Performance vs modeling habits

#3

coreed


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if you are running a 64-bit OS the 4GB of ram will not cut. 8GB would be a minimum.  128 mb on your video card should be fine

-----------------------------------

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"Revit has to be implemented, Not installed." 

Long Live Revit

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Thu, Jul 16, 2009 at 5:34:17 PM | Question re: Model Performance vs modeling habits

#4

structuresguy


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Sorry, should have mentioned i am using RS2009 on a Windows XP 32bit system.  I went through the model performance tech note for 2010, and really not doing too many things that they say would slow down a model.  I also have other projects where the rvt file is 60MB, and here i don't have such problems.  But these are steel frames with only a few concrete shear walls.

 

I have closed all unneccessary hidden windows and don't have any tiled, so maybe I have 2 or 3 plan views open at once.  I don't have any groups.  The slow downs occur while I am working in plan views, editing walls.  I can add new walls without too much difficulty though.

 

My view depth in plan is set to from a few feet above the reference plane, to a few feet below.  I have a lot of dwg files linked into my model, with each only linked into the appropriate view.  They were all loaded, but I have since unloaded all that I don't need currently.

 

I suspect the culprit may be due to joining too much geometry, as I have section cuts all over the place, and whenever I see a wall and slab overlap, I join the geometry.  I think this might be cuasing too many things to be joined together.  What do you think?

 

Thanks for the help.

 


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Thu, Jul 16, 2009 at 5:43:36 PM | Question re: Model Performance vs modeling habits

#5

WWHub


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Joining geometry might be the problem.  We only use that in special places where it has a big impact - like perspectives.  For sections, have you learned to use edit cut profile?  That's a better solution as long as you don't move the section cut.

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Thu, Jul 16, 2009 at 8:32:20 PM | Question re: Model Performance vs modeling habits

#6

structuresguy


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Well, I jsut went through all my sections and unjoined anything that was joined.  I also unloaded all the linked cad files.  And I purged out about 100 unused families.  And I compacted the file.  And I also deleted a whole bunch of section views I had cut all over the model to help me build out everything.  Probably deeleted about 18 out of 35 section cuts that I had in my model. 

 

All told, the rvt file went from 30MB down to 15MB, and the lag when moving walls and such is gone.  I could tell things were speeding up as I went around unjoining items.  It got kicker as I unjoined more things.  SO I think that was the main problem.  Eventually I will rejoin many things I think for views that make it on my sheets.  But for now, I will leave them alone.

 

Thanks.


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Thu, Jul 16, 2009 at 8:35:59 PM | Question re: Model Performance vs modeling habits

#7

structuresguy


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When you say "edit cut profile", do you mean the "edit profile" button that appears say when you select a wall?  If so, then yes, I has used that to edit wall profiles to make complicated profiles.  But where a wall and a slab overlap, I would typically use the join geometry to clean up the intersection in a Fine detail section that I would include on a sheet.

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Thu, Jul 16, 2009 at 8:48:34 PM | Question re: Model Performance vs modeling habits

#8

WWHub


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NO - I mean Edit Cut Profie!

 

Look in your HELP - Search "edit cut" - and read Changing the Cut Profile of Elements 


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Thu, Jul 16, 2009 at 9:03:57 PM | structuresguy

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jarosa


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Quoting structuresguy from 2009-07-16 15:32:20

"

Well, I jsut went through all my sections and unjoined anything that was joined.  I also unloaded all the linked cad files.  And I purged out about 100 unused families.  And I compacted the file.  And I also deleted a whole bunch of section views I had cut all over the model to help me build out everything.  Probably deeleted about 18 out of 35 section cuts that I had in my model. 

 

All told, the rvt file went from 30MB down to 15MB, and the lag when moving walls and such is gone.  I could tell things were speeding up as I went around unjoining items.  It got kicker as I unjoined more things.  SO I think that was the main problem.  Eventually I will rejoin many things I think for views that make it on my sheets.  But for now, I will leave them alone.

 

Thanks.

"
Great response. This will help out next user who searches re model performance. Too many users never respond back as to what fixed their problem.

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Thu, Jul 16, 2009 at 9:05:01 PM | Question re: Model Performance vs modeling habits

#10

structuresguy


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Well, I tried searching for "edit cut" and "edit cut profile" and neither came up with the page you mention.  Is this something new for 2010?  I am using structure 2009.  Thanks.

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Thu, Jul 16, 2009 at 9:11:27 PM | Question re: Model Performance vs modeling habits

#11

jarosa


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Edit cut profile is on the Modify Tab. An instance where you would use this is say you want the your slab edge thickened and you didn't model it so. You could edit the cut profile of the slab so it show a thickened slab. It is a view based modification meaning it doesn't change the model just the lines in the view. Below is a cadclip that shows how this works.

http://www.cadclips.com/DOWNLOADS/REVIT-9-DETAIL-EDIT-CUT-PROFILE.wmv


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Thu, Jul 16, 2009 at 9:32:31 PM | Question re: Model Performance vs modeling habits

#12

WWHub


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Edit cut profiles been around since I think the beginning and it is in your HELP.

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Fri, Jul 17, 2009 at 2:28:48 PM | WWHub

#13

structuresguy


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Quoting WWHub from 2009-07-16 16:32:31

"Edit cut profiles been around since I think the beginning and it is in your HELP."

While I appreciate you repeatedly telling me that it is in the help file, i can assure you that it is not.  I have the entire help file in PDF format, all 1600+ pages.  A search of the words "cut profile" results in no section describing the tool or its use at all.  It would have been much more helpful if you had just told me where to find the tool instead.

After searching through all the pull down menus, I did find it in the Tools pull down in RS2009, and it was called Edit Cut Profile. 

 jarosa:  thanks for the tip of using it for slab edges in details.  that works very well.

 


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Fri, Jul 17, 2009 at 2:36:50 PM | Question re: Model Performance vs modeling habits

#14

Typhoon


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"A search of the words "cut profile" results in no section describing the tool or its use at all." - i don't know in Struct. but in Arch. it does....

 



Attached Images

62911_cutprofile.png

-----------------------------------

I Hope and I Wish to LEARN  more, and more, and more.... REVIT

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Fri, Jul 17, 2009 at 2:46:35 PM | Question re: Model Performance vs modeling habits

#15

patton


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In Revit 2009 Structure, the help files don't look anything like what you just posted Typhoon. I attached a pic of what ours looks like and we certainly don't see what you do.

Attached Images

62912_REVIT_HELP_FILE.jpg

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