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Thread: CAD file optimization for Revit

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    CAD file optimization for Revit

    Hey guys,

    My colleague is experiencing some performance issues with detailed DWG file loaded in Revit. I've searched around and it seems the bottleneck in Hardware is very little.

    What would be your suggestions in making the DWG file "Light" for Revit?

    Thanks,


    Rok



    Attached Thumbnails Attached Thumbnails CAD file optimization for Revit-1.jpg  

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    Moderator cellophane's Avatar
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    delete everything you can, then purge the crap out of it. I typically use Radical Purge - it will pick up some of the bits and pieces that the standard purge doesn't take care of such as DGN linetypes. Just purging out the DGN junk I've seen files go from 30Mb to 3Mb.
    Andres Franco likes this.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    My suggestion (seriously) would be not to load that in to your project at all.

    Sent from my Phablet. Please excuse typos... and bad ideas.

    Aaron Maller
    Director
    Parallax Team, Inc.
    Necro99 and elton williams like this.

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    Quote Originally Posted by Twiceroadsfool View Post
    My suggestion (seriously) would be not to load that in to your project at all.
    Hey Aaron,

    Thanks for that. We use Line Select a lot to reference the drawings when we are modelling for productivity. If we are not loading it to the project, based on our current workflow we would see a productivity loss. Is there a better way?

    Thanks,

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    Member Andres Franco's Avatar
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    Hi yrokkim, Importing dwg's into Revit can be a headache, but sometimes one is obligated to work with, I suggest you to delete all unnecessary information as Chad said at top.

    Secondly as I Imagine you really need to work with the dwg file you must create a new Revit file with anything but you dwg inside, you can call this Rvt file (Ghost) or whatever you want, then you must set the shared coordinates of your ghost file to make it match with your project coordinates and finally you just link this Rvt ghost file into your project, that way you can have all the necessary dwg objects to work with into your project and once you've done you can just unload the Rvt linked file (ghost) with all the garbage inside without polluting your main file, hope this helps, regards
    Last edited by Andres Franco; June 21st, 2017 at 07:35 AM.

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    Member BD Mackey's Avatar
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    another thing that most people don't know is to Purge Registered application out of the AutoCAD file. To do this you must type -pu on the command line, then the option for Regg Apps. I have seen this remove 60,000+ reg apps and drastically speed up the AutoCAD file.
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    Moderator cellophane's Avatar
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    Quote Originally Posted by Andres Franco View Post
    Importing dwg's into Revit can be a headache, but sometimes one is obligated to work with, I suggest you to delete all unnecessary information as Chad said at top.

    Secondly as I Imagine you really need to work with the dwg file you must create a new Revit file with anything but you dwg inside, you can call this Rvt file (Ghost) or whatever you want, then you must set the shared coordinates of your ghost file to make it match with your project coordinates and finally you just link this Rvt ghost file into your project...
    I do agree with Aaron on not using the DWG in Revit at all but it isn't always viable for any number of reasons. In an ideal world recreation would be built into the contract because using DWG can cause problems that usually don't show up until you are pretty far into things. I have used the additional Revit file to minimize the effects of having the DWG in my project but it comes with its own set of issues depending on what you need it to do.

    Quote Originally Posted by BD Mackey View Post
    another thing that most people don't know is to Purge Registered application out of the AutoCAD file. To do this you must type -pu on the command line, then the option for Regg Apps. I have seen this remove 60,000+ reg apps and drastically speed up the AutoCAD file.
    +1 for getting rid of RegApps. Radical Purge will remove RegApps but if you don't have it what Brian mentioned will also do it.
    cganiere likes this.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Quote Originally Posted by yrokkim View Post
    Hey Aaron,

    Thanks for that. We use Line Select a lot to reference the drawings when we are modelling for productivity. If we are not loading it to the project, based on our current workflow we would see a productivity loss. Is there a better way?

    Thanks,
    This is the EXACT workflow i was thinking of, when i recommended not doing it. Using Pick Lines to model off of a CAD file will (eventually) cause a bunch of grief, in the Revit files. Angles get funky, dimensions end up off by random amounts, because CAD and Revit dont use the same "inside guts" for math and precision.

    Its sort of Buyer beware, but there are MANY documented cases of models getting all jacked up, from tracing CAD files. No way i would use that workflow, personally.
    cganiere likes this.

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    When I must. Once I do a Purge (including purging Reg Apps) & flatten the AEC objects with an Export to CAD if AEC objects exist. Once it's clean in that form I then open in Vanilla CAD & do another round of Purging to make sure & then WBLOCK out all the necessary content after the cleansing. I never Save a new the same/original file. Sometimes I copy/paste content into a virgin dwg template to clean up & then always WBLOCK as final step.

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    Senior Member sdbrownaia's Avatar
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    I totally second Aaron's wisdom on this as I have been down the jacked up model numerous times base on using pick lines and picking cad lines or even revit auto snapping to cad lines. If you do need to use it to "Trace" over. I feel it is fairly safe to link it in and draw over it pretending its not there to snap to and making sure you hold down the shift key as you draw walls so they don't snap to the lines in the DWG. Check your 90's frequently, etc. My preference would be to bring in a png file of the cad and scale it in revit and use that as your underlay, way less dangerous.
    cganiere likes this.

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