RE: [EnergyPlus_Support] geometry problem with alignment of window on none horizontal roof

Use the right hand rules to find the vector direction. A small 'angle' between two vectors can hava a large number, because they are pointing at different directions and measured in clockwise or counter clockwise direction..
==================
Your roof is practically flat. The slide rule or simple calculator will not work. You need to use triangular windows. Line up one edge and find another point on the surface. EPlus may tell you how much to adjust the third point.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeannieboef@xxxxxxxxx
Date: Wed, 4 Jan 2012 10:42:47 +0000
Subject: [EnergyPlus_Support] geometry problem with alignment of window on none horizontal roof

Hello Group,
I'm having trouble with a couple of window surfaces sitting on a very slightly none horizontal roof (please don't ask why it's not horizontal). The first time e+ ran, it threw an error that the difference between the base surface and the window surface was more than 180 deg. I reversed the verticies order, but now the difference seems even larger. Funnily looking at it in openstudio, I don't see any errors nearly this big.

Here's an example where I've already reversed the order:

BuildingSurface:Detailed,
118300_Roof_0_0_0, !- Name
Roof, !- Surface Type
1, !- Construction Name
51482D, !- Zone Name
Outdoors, !- Outside Boundary Condition
, !- Outside Boundary Condition Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
0, !- View Factor to Ground
7, !- Number of Vertices
-23.716795928400,-3.049668700700,4.850463841400, !- X,Y,Z ==> Vertex 1 {m}
-23.416829502300,-5.505177516300,4.850463838900, !- X,Y,Z ==> Vertex 2 {m}
-22.810640840000,-5.753296600100,4.850463839400, !- X,Y,Z ==> Vertex 3 {m}
-22.388041230000,-6.253733680100,4.850463839400, !- X,Y,Z ==> Vertex 4 {m}
-22.120806470000,-6.197311320100,4.850463839400, !- X,Y,Z ==> Vertex 5 {m}
-20.641571547600,-6.306840390000,4.850463837700, !- X,Y,Z ==> Vertex 6 {m}
-20.641571547600,-3.044599250000,4.850463837700; !- X,Y,Z ==> Vertex 7 {m}

! Window, 1,440m2

FenestrationSurface:Detailed,
118300_Roof_0_0_0_0_0_0_Win, !- Name
Window, !- Surface Type
1001, !- Construction Name
118300_Roof_0_0_0, !- Building Surface Name
, !- Outside Boundary Condition Object
0, !- View Factor to Ground
, !- Shading Control Name
, !- Frame and Divider Name
1, !- Multiplier
4, !- Number of Vertices
-22.584122814200,-3.577712414500,4.850463821025, !- X,Y,Z ==> Vertex 4 {m}
-22.584122814200,-4.777712414500,4.850463821025, !- X,Y,Z ==> Vertex 3 {m}
-21.384122814200,-4.777712414500,4.850463821025, !- X,Y,Z ==> Vertex 2 {m}
-21.384122814200,-3.577712414500,4.850463821025; !- X,Y,Z ==> Vertex 1 {m}
!REVERSE

GlobalGeometryRules,
UpperLeftCorner, !- Starting Vertex Position
Counterclockwise, !- Vertex Entry Direction
Absolute; !- Coordinate System

Building,
Untitled, !- Name
0.0, !- North Axis {deg}
Suburbs, !- Terrain
0.04, !- Loads Convergence Tolerance Value
0.4, !- Temperature Convergence Tolerance Value {deltaC}
FullExterior, !- Solar Distribution
25; !- Maximum Number of Warmup Days

Site:Location,
C4AFD6, !- Name
0.0, !- Latitude {deg}
0.0, !- Longitude {deg}
0.0, !- Time Zone {hr}
0.0; !- Elevation {m}

Zone,
51482D, !- Name
0.0, !- Direction of Relative North {deg}
0.0, !- X Origin {m}
0.0, !- Y Origin {m}
0.0, !- Z Origin {m}
, !- Type
1; !- Multiplier

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