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Thread: Interference Check Help

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    Junior Member waikikigirl's Avatar
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    Interference Check Help

    Hey

    How do i get interference check in Revit MEP to work everytime i run it an error message pops up ??
    please help im so stumped .
    Attached Thumbnails Attached Thumbnails Interference Check Help-error-message.jpg  

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    Moderator snowyweston's Avatar
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    Good chance you're over-taxing your computer - interference check (and Revit in general) isn't particularly stable at the best of times - and if you're throwing it at large model, it'll chug hard (or as you're seeing, roll over and die)

    Try reducing the extent of your clash test - or better yet, (if you have it) move over to Navisworks Manage...

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    Junior Member waikikigirl's Avatar
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    I opened Navisworks Manage for the first time ever today and loaded the models (Mech, Electrical and architecture) into it but the mech model didnt line up... i managed to rotate it but the alignment is completely out.

    I have no idea how to get it into exactly the correct position cos there's only one set of grid lines and the mech model is just ducting and pipes floating around so there aren't any walls i can align it to.... so after fighting with it for half the day I've given up lol and doing clash detection the loooooong way via Revit.

    Oh and i just had extra Ram installed so my computers running on 32G Ram ... how big does your PC need to be so it doesn't "roll over and die"?

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Quote Originally Posted by snowyweston View Post
    Good chance you're over-taxing your computer - interference check (and Revit in general) isn't particularly stable at the best of times - and if you're throwing it at large model, it'll chug hard (or as you're seeing, roll over and die)

    Try reducing the extent of your clash test - or better yet, (if you have it) move over to Navisworks Manage...
    Revit isn't stable? Really? I can count the number of crashes I've had this year on one hand.

    I have trouble believing 32gb of ram isn't enough, but I will say that interference checking in revit completely sucks to work with.

    Fixing the coordinates and alignment is much simpler than fussing with revit interference checking. I would publish coordinates from your model to the consultants (if yoy are SURE they are in the right place), then have everyone re export to navisworks.
    Necro99 likes this.

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    Moderator snowyweston's Avatar
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    Quote Originally Posted by waikikigirl View Post
    how big does your PC need to be so it doesn't "roll over and die"?
    Depends on the model.





    Quote Originally Posted by waikikigirl View Post
    I've given up lol and doing clash detection the loooooong way via Revit.
    You will kick (& hurt) yourself that way... stick with the fight. But not with the software - your team. Who has supplied the models you're working with - and who is* charged with ensuring your models are coordinated? Yourselves, or consultant partners, someone else? That's your (& the project's) first problem - that needs immediate rectification.

    Getting your models aligned (in Navis) is near-easy-as if they are (properly) aligned within Revit first - are you/is the project using Shared Coordinates?


    *Since you're running the clash, I will presume it is you/your firm (unless you're purely being proactive on your side of things - which is highly commendable) - in which case, were you supplied the Navis files by others? Again, it's on them to play ball properly - so if they're model(s) is/are coming through on the wonk, politely reject them as unfit, and have the teams fix and resend them - you really do not want** to be inviting risk by manipulating their work to suit a workflow.

    **that said, if you are overly anxious to get this done, you could "Publish Coordinates" from your (Revit) model to the linked files, save/commit their changed locations, then re-run the Navis export - and all will (read: should) align in the Navis space.... then it's the (relatively) simple exercise of setting up your clash tests. Of course, until your consultant partners (?) use "Acquire Coordinates" you will be doing that each and every time they send you an update... But again, that's all dependant on whether you are the controlling authority of coordinating the location of the model(s).

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    Junior Member waikikigirl's Avatar
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    let me try and explain this.... okay here goes(drum roll)....

    I am the consulting firm and we're doing the electrical and Mech on the project buuuuut we each have our own central file and havent set up ONE central file with worksets (as we should have).
    The architects model and the electrical one line up perfectly but the mech one which is my baby (although i didnt do the initial setup) is rotated 90deg in the wrong direction for some reason.

    Ive tried rotating the mech model but then Revit moans about my pipes disconnecting (which i really really really don't want to have to reconnect as the project is practically fully modeled its just clashes)

    what we've done is link in the architecture and the electrical model in mine(mech model) on Revit and theres no problem only when i load them into Navisworks separately is rotation the problem.

    ...okay done hopefully that clears things up a bit

    Is there a way to load the mech model with all the links straight to Navis? Ive tried this but it only shows the mech models pipes.ducting,etc

    If i understand correctly i have to "publish co-ordinates"in the mech model and it will affect both the architects and the electrical links and then export it into Navis as one ?

    thanks for this (i feel like im having more than a few ""blonde moments today)

  7. #7
    Moderator snowyweston's Avatar
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    Try this: In your Navis export settings (in Revit), make sure "convert links" is checked, then export the lot at once to a single .nwc - Navis will put the models under their own "branch" in the selection tree - then you should* be good to go.


    *unless in the conversion process Navis picks up on - and spits out - the linked models' misalignment, which will return you to square one, but worth a shot nonetheless.

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    Quote Originally Posted by waikikigirl View Post

    Is there a way to load the mech model with all the links straight to Navis? Ive tried this but it only shows the mech models pipes.ducting,etc
    Unfortunately, Revit Links are not like AutoCAD Xrefs... when you bring in a Link, you cannot see the "child" links attached to that file. Put another way, Revit Links only go one level out, like spokes on a wheel and not a tree.

    I recently ran into this problem with my current project. The frustrating thing is that I saw it coming from Day One, and tried to match the architect's origin point, but they moved their model for some reason. At that point, I was in the same situation you are, I couldn't just "move" mode whole model without breaking everything. But, thankfully, our model wasn't rotated, nor was off of in the Z dimension, so manual alignment wasn't that big of a deal, and it only had to be done once.

    I am curious about why your mechanical and electrical models are separate. A big part of Revit's functionality, for us at least, is the ability to put accurate load information into the electrical connectors of the mechanical equipment. For instance, if I place a 5 kW electric duct heater in the model, it will be visible on the electrical views and it's connector will have the correct voltage, phase, and load in kVA. We would lose that ability if mechanical and electrical were in separate models. Maybe you're not there yet, but on future projects you really should consider keeping M, E, and P all in the same model.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Exporting to navis with the Convert Links box checked WILL work, but it's a lousy fix. It's not a great way to export to navisworks. (It won't pick up on the misalignment, it will export how it is in the current revit file?)

    The better thing to do is fix the coordinates, and export the models all individually. Much nicer navis file that way.

  10. #10
    Forum Co-Founder Twiceroadsfool's Avatar
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    Btw, for the sake of keeping the thread full of good information, JUST like autocad a revit link cam be an overlay or an attachment. When it's set to attachment it WILL show when the parent revit file is linked in to another revit file.

    But it has no effect on the issue you are having in the thread. And it's a lousy (imho) way to link in revit files, as they are harder to control that way.

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