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Thread: DWG to PNG to RVT?

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    Forum Addict GMcDowellJr's Avatar
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    DWG to PNG to RVT?

    On the discussion of keeping DWG out of Revit... I'm not in a position to mandate it so I'm looking for ways to mitigate it. Has anyone tried printing the DWG to an image file and inserting that into Revit? If it's truly for reference only then it should be good enough.

    I believe the magic number for DPI to drop into Revit at the correct "scale" is 72 but so far my tests of a site plane from civil isn't working out quite the way I thought it would. I think I'm missing something (it's been a long time since my AutoCAD days).

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    Member HansLammerts's Avatar
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    A really Silly idea. Why not make a photo of printed revit sheet first?

    There is nothing wrong with bringing rvt and dwg together. As long as you know the limitations and how to handle datasets as bim manager. Bim is all about combing data..
    Last edited by HansLammerts; February 12th, 2019 at 06:00 AM.

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    Our BIM protocols state that DWGs should only be linked into projects and not imported. If this happens then the DWGs are easy to manage. We use Ideate Explore to interrogate our models, which shows all imported DWGs. We can delete them using this.

    I don't believe that there something inherently wrong with using DWGs in projects. I would imagine that if these were image files instead you would be introducing other problems - are these really easier to manage than DWGs in the project? The DWG at least has accurate information.

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    Forum Addict GMcDowellJr's Avatar
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    DWG to PNG to RVT?

    Quote Originally Posted by HansLammerts View Post
    There is nothing wrong with bringing rvt and dwg together.
    Not at all true. Merely have the DWG inside of Revit can lead to issues in the database. Lots of discussions here on the subject.

    But thanks for the “silly idea” comment. Helpful.


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    Last edited by GMcDowellJr; February 12th, 2019 at 12:03 PM.

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    Forum Addict GMcDowellJr's Avatar
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    Quote Originally Posted by Tim123 View Post
    Our BIM protocols state that DWGs should only be linked into projects and not imported. If this happens then the DWGs are easy to manage. We use Ideate Explore to interrogate our models, which shows all imported DWGs. We can delete them using this.

    I don't believe that there something inherently wrong with using DWGs in projects. I would imagine that if these were image files instead you would be introducing other problems - are these really easier to manage than DWGs in the project? The DWG at least has accurate information.
    Linked is not much better than imported. Still leads/can lead to issues in the database.

    Tracing DWG directly is the worst. Best approach is to recreate from scratch based on the DWG but referenced outside of Revit. An image would allow for at least a little of both and might be an acceptable background for some views.

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    We find that we still need to bring in CAD drawings. Not all of our consultants use Revit yet, so we need to bring in their CAD drawings for coordination. Sometimes the existing building only exists as a CAD drawing so we use this as a starting point to model the existing (making sure that the lines are not slightly off axis). We also need to link in surveyor’s drawings to create the topo, set the coordinates and true north and check the elevations.

    I would be interested to know what database issues you have with linked DWGs? Linked drawings can be controlled and easily deleted from the database, so when we are finished with we remove them from the project. We also place them on a separate workset so that they don’t get in the way all the time.

    If you are using the CAD specifically for visual effects then your suggested workflow may be worth considering, but I think that you will be introducing other problems. The CAD drawing will be way leaner than the image as it is vector based, and the image will be very difficult to scale accurately.

    I’m with you on moving on from CAD, but currently we have to deal with them – we don’t have any problems if we do this in a controlled way. When users import a DWG without checking ‘Current View Only’ it creates issues (therefore banned by our protocols), but I can still find them and remove them from the project.
    koolair likes this.

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    Forum Addict GMcDowellJr's Avatar
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    Search the forum if you want to know why it’s bad to combine them.

    In a nutshell, they calculate and understand geometry differently.

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    Junior Member BogdanM's Avatar
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    We try to limit the effects of DWGs in a Revit production file by using a so-called "Ghost" file.
    This is a blank Revit file that holds all the DWGs, then it's linked in the production file.
    The DWGs are on separate views in the Ghost and we use the "by linked view" option in the production model. The lines in the DWGs can still be picked if needed for dimensions or modeling something.
    GMcDowellJr, koolair and Nurlan like this.

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    Forum Addict GMcDowellJr's Avatar
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    That’s in interesting approach. I wonder if it keeps the bad out of the file. Is linking a Revit file fundamentally different from linking a DWG? Maybe... maybe not. Either way, still shouldn’t trace the DWG.


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    Moderator cellophane's Avatar
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    Quote Originally Posted by GMcDowellJr View Post
    Search the forum if you want to know why it’s bad to combine them.

    In a nutshell, they calculate and understand geometry differently.
    I have it saved. At least one of them.
    https://www.revitforum.org/architect...tml#post215047
    GMcDowellJr likes this.

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