Forums >> Revit Building >> Technical Support >> Ortho Drawing Precision / Project North Alignment

Tim79

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Joined: Mon, Jun 15, 2009
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Hi there, 

I'm having a very frustrating time setting up a new project with its Project north.

The Othogonal alignment of the project is about 45.113d from the geographic north. When I rotate a plan view (project north) to align to an orthogonal element (site boundary etc) on the site survey DWG file, the view turns as it should - all is well - the reference element appears perfectly horizontal on my view.

THEN, I draw something: a line, section, grid etc, I wait for the ortho mode to say HORIZONTAL and I click......... just that it is not horizontal in the view. I see stepping pixels along the element on the screen, and I can measure an angle 0.113d.... between the new element and the original reference element in the DWG reference........  

This is driving me nuts!!!! Just when I want to start a project well. I imagine that Revit is trying to be too clever somewhere and eliminate the fraction of an angle, that is in fact important. Is there a setting somewhere that might fix this?

Please help!!

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

So you have nothing in your file initially then you inserted the CAD survey - correct?

Try the following process:

1. you should typically insert the CAD file as this view only, into your site plan.  That keeps it 2D which it is. 
2. Set the view properties to true north
3. If the cad file is not true north up, then select it and rotate it until it is true north up.
4. Acquire coordinates from the CAD file.  This will set your survey correctly.
5. Now you can change the view to project north and use the rotate project north tool.

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Tim79

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Joined: Mon, Jun 15, 2009
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Yes that's right.

I have proceded with your first 4 step which appears to work fine.

Regarding project north, I have a habit (not sure if this is good or not) of leaving it aligned to true north, and simply using the project/true north setting in a plan view just to unlock the free rotation of each plan.....

Please look at the file I have attached. There is a site plan view (oriented true north) and a ground floor plan view aligned to the architectural plan the way I want it. Please note the "horizontal" detail line towards the top of the ground floor plan - This is my problem.

Thanks very much for your efforts

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WWHub

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Joined: Tue, May 16, 2006
13079 Posts

You really have this messed up.  Look at the project and survey points attached.  You did not do what I suggested.  It appears that your rotated your view and did not use the rotate project north tool.

I suggest you start with a clean, new project.  Once you mess these up, they are very hard to correct.

BTW - Revit will try to align new objects with existing objects... even if they are slightly askew.

Attached Images

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Tim79

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Joined: Mon, Jun 15, 2009
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OK, Thanks for your help

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Rotating project north (I've done stuff wrong and need help)

5

project north/true north

2

North Point and project orientation

8

Project North and True North

1

Project North & True North

4