[Equest-users] tilt axis

[Wesley S. Care]

Folks,

I think I may have finally worked this one out.

It seems that the polygons always tilt on their local x-axis (independent of space or shell coordinate systems). I don't know how eQUEST determines the axes from the initial wizard inputs, but you can redefine polygons to force it.

I have access to CAD, so I've been recreating the polygons in CAD and twirling them around/changing the 1st vertex so that the x-axis and my intended tilt axis are the same, then inputting the new vertices back into the .inp file as a new polygon. You then have to wrestle the roof/wall back to its intended spot. Measuring off of a CAD file helps here too.

I haven't done too many, let me know if that works for others. And as noted by some very experienced users earlier, think about cost/benefit ratio before you spend lots of time on sloped roofs.

Thanks, 
      Wesley

Energy Systems Design
Mechanical Engineers + Electrical Engineers + Sustainable Design
 
Wesley Care, EIT | Mechanical Project Engineer
wesley.care at esdaz.com
480.481.4973

-----Original Message-----
From: Ali Murat Tanyer [mailto:tanyer at metu.edu.tr] 
Sent: Tuesday, August 23, 2011 1:14 AM
To: Nick Caton
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] tilt axis

Dear Nick and Others,

The advice on playing with the surface azimuth is not working. I tried 4 
different azimuth angles (see attached image az1.jpeg) and in all of 
them the rotation is along the short edge. I would like the rotation 
along the long edge. But how to do that?

There are 2 advices on the list:
http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2009-September/002320.html
http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010-April/004219.html

The first one (inverting the X and Y coordinates) is close to the 
solution but coordinates are the mirror (see attached image az2.jpeg). 
The second one does not work at all.

Any suggestions?

Thanks




On 23/08/2011 01:03, Nick Caton wrote:
> Hi Ali,
>
> I assume you're asking about a detailed-level edit.
>
> The angle of the tilt axis is defined indirectly by the azimuth.
>
> Adjust your surface azimuth until the "tilt axis" appears correct, then
> adjust your X/Y/Z coordinates to reposition the surface.  You may wish
> to copy/modify the polygon being referenced if the end-result is too
> wacky-looking.  This is often a good time to ask yourself: is
> "correcting" this shape necessary for model accuracy, or only achieving
> aesthetic results?
>
> If rectilinear, you may find it easier to define tilted roof geometries
> by height/width: Change "Location: Top" (default for flat roofs coming
> out of the wizards) to one of the vertex options, set Z=space height,
> and go to town with the 3D view in the background to see what's going on
> as you tweak the width/height/tilt variables.  Reference the associated
> space polygon(s) if necessary to ensure your decimal dimensions will
> sync with the rest of the model.
>
> Best of luck,
>
> ~Nick
>
> NICK CATON, P.E.
> SENIOR ENGINEER
>
> Smith&  Boucher Engineers
> 25501 west valley parkway, suite 200
> olathe, ks 66061
> direct 913.344.0036
> fax 913.345.0617
> www.smithboucher.com
>
>
> -----Original Message-----
> From:equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ali
> Murat Tanyer
> Sent: Monday, August 22, 2011 2:47 PM
> To:equest-users at lists.onebuilding.org
> Subject: [Equest-users] tilt axis
>
> Dear all,
>
> I want to tilt my roof slab. However, the tilt axis appears along the
> short edge. How can I change the tilt axis so that the roof slab rotates
>
> along the long axis?
>
> Thanks
>
> Ali Tanyer, MSc, PhD
>
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