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Forums >> Revit Building >> Technical Support >> coordinates in revit
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Can any one explain me 1. How to import the dwg file with same coordinates into revit, for eg. i am importing cad files into revit with origin to origin option, but then, when I pick coordinates in revit it showing different value then in cad file. 2. In cad we can change the UCS for our convenient working direction, so how do we do the same thing in revit without changing its coordinates
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It does depend on where the origin in the AutoCAD drawing - if it is far away then use the centre to centre rather. One the drawing is imported, got Tools / Shared co-ordinates / Aquire co-ordinates. This will then have the same co-ordinates as hte AutoCAD drawing. You can also specify co-ordnates at a point, if you know them. This is used instead of the UCS system in AutoCAD.
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Revit uses a project and true north setting. True north is used for accurate sun positions, co-ordinates etc, while project drawing orientates the drawing to the rotation that you want to draw in.
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Thank tim, At last i found that my cad file is too far from its origin, so i tried importing cad file with center to center instead of origin to origin option and then i rotated my true north so that my site will be parallel to my screen, then i specified coordinates at a point but then the other points are not coming correct. Look at the attachment, these are the coordinates acquired from cad file. In revit i specified P1 coordinate but P9 value in revit shows 2616628.335 N and 632075.150 E (units mm) so where i went wrong? Thank you
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Check that the AutoCAD drawing has not been bound in as a block. If the drawing is a block it seems to give different coordinates - explode the block and it should work.
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hi tim, I checked in rautocad file, its not block file. So the values in auto cad is correct but some how its not coming in revit. Or i dont know where i went wrong! Thank you push
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Check that your drawing has the correct units. If the units are not set to mm in AutoCAD (ie unitless) then it may not have come through to Revit with the correct units when using Auto Detect - measure a distance between two points in Revit to verify. Also check the rotation of the drawing. If the orientation is differrent the coordinates will not align.
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hi tim, I checked the units in cad its in mm only and checked distace between two points in revit, its same as cad angle also same! but still coordinates are different for both the points!!In revit when we specify coordinates its asking for elevation, how it will determine the elevation of the other points? Does it any ways going to affect our coordinate value?
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Are you using the 'Shared Coordinates / Specify coordinates at a point', under Tools menu? Do this in a plan view. This should not have any reference to an elevation. Adjust the elevation of the project using the relocate project feature.
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hi tim,ya i am using the 'Shared Coordinates / Specify coordinates at a point', under Tools menu and in plan view only.there we can specify elevation of that point. Because my points are not in same level, i have slopes in my site.
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Do you have a datum level that you are working from? The ground floor level is good for this. In an elevation or section relocate the project by moving it so that the levels on the site reflect the correct survey heights. You can then choose if you want to view the heights from the datum or the heights above sea level.
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Hi, Please find the attachment of 2 cad files, the grid file is the original autocad file and the other one is exported cad basement file. Now The coordinate at grid intersection 1 and A is N 2613535288mm E 629102306mm.1. How do I export my revit file to the same coordinate? Because other consultants needs with original coordinates.2. Should we export from revit with project north or true north? My true north is rotated 17 deg, when I export my revit with true north all my annotations are not rotating as per true north. How do correct this one? When i use project north then the WCS of auto cad is different, i have to rotate and move to its location!! is this the way revit works??? Thank you push
Edited on: Mon, Mar 2, 2009 at 2:11:52 AM
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When you rotated your project, did you rotate the true north or project north. True north must always point to true north. Project north rotates yor project to make it more convenient to work. This may be affecting your co-ordinates.
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avatech just did a webcasy on this. They recorded it and you can watch it at http://www.avatech.com/events/webcasts/recorded.aspx . It is the webcast on managing multi discipling jobs on revit.
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Thanks for all ur helps, I am moving all my cad files to 0,0,0 and importing into revit. At last i have to export from revit and move to its original position. I hope in future Autodesk would provide better solution to work with larger coordinates.push
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47402_coordinates.doc
54166_from_revit.dwg