[Bldg-sim] DOE-2.2 geometry import troubles

[Josh K]

Hi Brandon;

I've been doing some "reverse engineering," and I keep coming back to the
same problem: my FLOOR AND SPACE polygons appear in eQuest exactly where I
expect them to, but all of the EXTERIOR-WALL polygons, if no translations
are applied (ie X, Y, Z, AZIMUTH, TILT = 0) , appear rotated 180 degrees
around the building coordinate X axis relative to where I would expect them
to be. Also, oddly, the TILT and AZIMUTH transformations, when specified,
take place relative to this rotated coordinate system -- ie, the AZIMUTH
rotation is about the buidling coordinate *negative *z-axis -- while the
translation transformation (as specified by X, Y, and Z) take place as
expected (in the building coordinate system).

Very strange stuff. I get the feeling that this has something to do with the
EXTERIOR-WALL coordinate system being dependant on the SPACE coordinate
system which is, in turn, dependant on the FLOOR coordinate system. As it
stands, my FLOOR, SPACE, and EXTERIOR WALL object that represents the floor
all use the same POLYGON object -- does anyone know if this in itself is a
problem? My instinct is that I'm somehow misunderstanding this relationship,
but I've done some fiddling in this regard and haven't been able to change
very much...

Again, if anyone has any insight on this issue, it would be greatly
appreciated.

Thanks a lot,

Josh

On Fri, Nov 7, 2008 at 1:47 AM, Brandon Nichols <bwnichols at gmail.com> wrote:

> Suggest reverse engineering...define your objective in eQuest (starting
> with the lower-leftmost vertex for all polygons) and compare the resulting
> inp file to yours.  Also take a close look at the DOE2.2 documentation,
> wherein the coordinate system is detailed.
>
> Suspected root cause issue is the disconnect going from the eQuest
> Floor/Zone editor, where all zone (space) coordinates are entered absolute,
> to the .inp file where the eQuest stores coordinates of space polygons
> relative to the floor polygon.
>
> Suggest always starting all polygons with the lower-leftmost vertex, to
> help make sense of the relative coordinates and azimuths.  This habit is one
> you'll be glad to have acquired, should dissecting inp files become your
> muse.
>
> Regards
>
> Brandon Nichols
> BW Nichols PE
> Seattle WA
>
>
> On Nov 6, 2008 4:34 PM, "Josh K" <jeemang at gmail.com> wrote:
>
> Hi all;
>
> I'm trying to figure out how to manually enter geometry in DOE-2.2 and I'm
> having a little bit of trouble. My problems are myriad, but they essentially
> boil down to this: when I enter
>
> polygon.0 = POLYGON
>   V1 = (0.0,0.0)
>   V2 = (200,0)
>   V3 = (200,300)
>   V4 = (0,300)
>   ..
>
> floor.0 = FLOOR
>   AZIMUTH = 360
>   POLYGON = polygon.0
>   SHAPE = POLYGON
>   FLOOR-HEIGHT = 3.28
>   SPACE-HEIGHT = 3.28
>   ..
>
> space.0 = SPACE
>   ZONE-TYPE = UNCONDITIONED
>   POLYGON = polygon.0
>   SHAPE = POLYGON
>   ..
>
> face.0 = EXTERIOR-WALL
>   POLYGON = polygon.0
>   X = 0
>   Y = 0
>   Z = 0.0
>   AZIMUTH = 0.0
>   TILT = 0.0
>   CONSTRUCTION = "EWall Construction"
>   ..
>
> and import it to eQuest (the only good way I can think of to check if I've
> entered my geometry correctly), the resulting EXTERIOR-WALL surface is not
> where I expect it to be. I was expecting it to be in "NE" quadrant of the
> the building's XY plane, but instead it's in the "SW" quadrant, as if it had
> been rotated 180 degrees about the building coordinate system's z-axis.
> Puzzlingly, the SPACE and FLOOR objects appear where I would expect them to
> -- in the building's "NE" quadrant.
>
> Clearly I'm misunderstanding something about how POLYGON objects are to be
> positioned. If anyone could help me to understand what I've got wrong, I
> would greatly appreciate it.
>
> Many thanks,
>
> Josh
>
>
> --
> Josh Kjenner, EIT, LEED AP
> Manasc Isaac Architects Ltd.
> 10225 100 Avenue :: Edmonton, AB T5J 0A1
> 780.429.3977
>
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-- 
Josh Kjenner, EIT, LEED AP
Manasc Isaac Architects Ltd.
10225 100 Avenue :: Edmonton, AB T5J 0A1
780.429.3977
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