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Dimension irregular walls

16 ANTWORTEN 16
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Nachricht 1 von 17
tonytwok
875 Aufrufe, 16 Antworten

Dimension irregular walls

I'm looking for advice on dimensioning walls of variable thickness. As you can see from the screenshots I started from the right wall with an aligned dimension and then added the subsequent points with the Edit guide lines command. However, by doing this the odds are completely off the table. Isn't there a possibility of blocking the position? 

A.jpg

B.jpg

  

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16 ANTWORTEN 16
Nachricht 2 von 17
barthbradley
als Antwort auf: tonytwok

Are any of the walls perpendicular? 

Nachricht 3 von 17
tonytwok
als Antwort auf: barthbradley

None of the walls is perpendicular.

Nachricht 4 von 17
barthbradley
als Antwort auf: tonytwok

Why? Is it an as-built or are you planning its construction? 

Nachricht 5 von 17
tonytwok
als Antwort auf: barthbradley

It's the model of an existing building lidar surveyed.

Nachricht 6 von 17
barthbradley
als Antwort auf: tonytwok

The question still remains; why do you need to dimension it?  Are you building the construct?  

Nachricht 7 von 17
mhiserZFHXS
als Antwort auf: tonytwok

Are the walls actually off-perpendicular, or was the lidar slightly inaccurate? Even if they are only slightly off, is it worth not just modeling so its clean?

Nachricht 8 von 17
ToanDN
als Antwort auf: tonytwok

I agreed with @barthbradley .  We only dimension new to existing, not within existing.  

 

With that said, you can use TAB to use wall intersection points, not wall faces, to witness the dimensions.

Nachricht 9 von 17
barthbradley
als Antwort auf: tonytwok

528ASKEW.png

528ASKEW2.png

Nachricht 10 von 17
tonytwok
als Antwort auf: barthbradley

Because I'm doing a restoration and I need precise dimensions.

 

It's simpler build a model exactly from cloud points instead adjust wall and have false dimensions.

 

The questions is why Revit's dimensions doesn't are simple like AutoCAD are? 

Nachricht 11 von 17
tonytwok
als Antwort auf: mhiserZFHXS

Walls are not perpendicular because the building is old, survey is really accurate. 

Nachricht 12 von 17
tonytwok
als Antwort auf: barthbradley

These are coordinates, not dimensions 

Nachricht 13 von 17
barthbradley
als Antwort auf: tonytwok


@tonytwok wrote:

These are coordinates, not dimensions 


 

Yes, I know. That's how I'd plan it and lay it out and build it - using coordinate points.  It's not novel.  Many constructions are planned and built that way.  

Nachricht 14 von 17
barthbradley
als Antwort auf: tonytwok


@tonytwok wrote:

Because I'm doing a restoration and I need precise dimensions.

 

It's simpler build a model exactly from cloud points instead adjust wall and have false dimensions.

 

The questions is why Revit's dimensions doesn't are simple like AutoCAD are? 


 

I don't know what you are talking about or comparing between Revit and AutoCAD. You can certainly dimension your askew walls by TAB-Selecting the corner points, but what value are those dimensions on paper to the contractors in the field?  They're worthless.  

 

Worthless Dims.png

 

 

Nachricht 15 von 17
barthbradley
als Antwort auf: tonytwok

One other point:

 

You are working from a LIDAR.  That LIDAR doesn't reflect the framing of the structure. Just what is attached to the framing.  I'll bet money it was framed level and plumb originally.  It may still be level and plumb. How old is this building? 

Nachricht 16 von 17
tonytwok
als Antwort auf: barthbradley

The building is 50 years old, at the time it was possible that the walls were not perfectly square. Furthermore, the perimeter walls on the upper floor coincide with the lower ones, so if I had had to square the walls I would only have created measurement errors.

 

Why so much precision? Because here in Italy the law allows a measurement tolerance of 2% and when you survey the building it is necessary to write the dimensions of each element. 

 

So, going back to the beginning, dimensioning irregular buildings with Revit is quite complex, furthermore very often the dimensions from corner points go wrong later for no reason, this bug is very frustrating.

Nachricht 17 von 17
barthbradley
als Antwort auf: tonytwok

 I don't know what the frustration is at your end, but there is no "bug". 

 

Here's a screenshot of pentagon sides dimensioned in Revit using both Aligned and linear Dimension Styles.

 

DimRevitvsAutoCAD1.png

 

 

 

Here's a screenshot of that Dimensioned Revit Pentagon Exported to AutoCAD and dimensioned using AutoCAD's Linear and Aligned Dimension Styles.  The white dimension are AutoCAD's.  Magenta belongs to Revit. 

 

DimRevitvsAutoCAD2.png

 

 

Note that the dimensions values between both are identical between both.  1/256" precision! 

 

Are you using TAB-Select to cycle to end points when placing dimensions as I mentioned in previous post?  Are your Snaps turn on (Manage Tab).    

 

 

 

 

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