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Roof inaccuracy in section??

6 ANTWORTEN 6
GELÖST
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Nachricht 1 von 7
Anonymous
1583 Aufrufe, 6 Antworten

Roof inaccuracy in section??

Hi everyone,

I noticed something in the Revit 2017 and Revit 2018, hope this will fix in next version... roof inconsistency.PNG

These are two roofs, the grey one modeled with extrusion, the white one modeled with edit points. They have the exactly the same slope and elevations, but the white one is not showing the right thickness (400). The steeper it is, the bigger the difference it gets. Is it a common bug with everyone, or should I take care of something when modelling a floor with editing points? It's annoying not be able to trust a roof edied like this from now!

 

Any ideas or considerations on that?

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Nachricht 2 von 7
ToanDN
als Antwort auf: Anonymous

The thickness of the edited point roof is still the vertical dimension because revit still considers it a flat roof. So the steeper is the roof the thiner it will be.

Roof by extrusion or sloped roof by footprint are true sloped roof, so thr thickness is the dimension perpendicular to the slope.
Nachricht 3 von 7
Anonymous
als Antwort auf: ToanDN

I saw them Toan, but in the construction drawings you rely on the actual thickness, not on the projection, so I have to warn users of this possible problem. Still don't understand why they chose this way of programming the command, to me still remains a drawing inaccuracy.

Nachricht 4 von 7
barthbradley
als Antwort auf: Anonymous

Revit even fesses up sometimes...

 

Thickness may be slightly inaccurate. Dimensions in sections and details may not accurately indicate the Thickness shown in Type Properties.

 

 

Nachricht 5 von 7
ToanDN
als Antwort auf: Anonymous


@Anonymous wrote:

I saw them Toan, but in the construction drawings you rely on the actual thickness, not on the projection, so I have to warn users of this possible problem. Still don't understand why they chose this way of programming the command, to me still remains a drawing inaccuracy.


I think the original intention of editing sub-elements of a roof is meant for flat roof with a variable thickness layer, a flat bottom and non-flat top.

Nachricht 6 von 7
loboarch
als Antwort auf: ToanDN


@ToanDN wrote:

@Anonymous wrote:

I saw them Toan, but in the construction drawings you rely on the actual thickness, not on the projection, so I have to warn users of this possible problem. Still don't understand why they chose this way of programming the command, to me still remains a drawing inaccuracy.


I think the original intention of editing sub-elements of a roof is meant for flat roof with a variable thickness layer, a flat bottom and non-flat top.


This is correct. The way the tool was "programmed" was to solve a particular problem. So the math and geometry is worked out as if the roof is flat and measurements/offsets are based on that. Because of the difference in projection the geometry of a sloped roof using a slope arrow or sloped edge is going to be different than when you offset an edge using the shape editing tools. To say it is "inaccurate" may not exactly be a fair characterization. It is not the SAME as when the geometry is projected from a parallel plane instead of a horizontal one.

The tool even has a warning about it when you have a fairly significant shape edit in place.

 

2018-08-14_1330.png

 

It is important to understand what the tool is doing and to use the right tool in the right situation.



Jeff Hanson
Principal Content Experience Designer
Revit Help |
Nachricht 7 von 7
Anonymous
als Antwort auf: loboarch

I get your point.. I knew this tool was meant for a specific problem, but my users use that tool for most of their roofs,
Because it's much intuitive and quick, especially when you're in design phase and you're not bounded to slope restrictions..
Sorry for the scolding, it's just I was really annoyed when I discovered this, and none of my Revit mentors or online courses never pointed out these things in the past..
Anyway, good work to everyone and thanks for your replies!

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