Inconsistency in Angular Conventions for CFS Modeling in WINDOW 8.0.33.0

[rw.h...@gmail.com]

Dear experts and heavy users,

I'm encountering an issue with angular conventions while modeling a CFS (Venetian blinds) in WINDOW 8.0.
Reference: Window 6.1 / Therm 6.1 Research Document (LBL)

According to this documentation, the angular coordinate system uses:

• x, y, z and θ, φ (theta, phi) for incident angles

• φ = 90° corresponds to above the horizon

• φ = 270° corresponds to below the horizon

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Question / Problem Statement

The BSDF and MatrixReader appear to follow this convention, but the AngularData.csv file seems to break it. Why?

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Observations

You can find a visual summary of the issue in the following slides:
Google Slides – Angular Convention Problem Description

The relevant files are available here:
Google Drive – Supporting Files

1. BSDF vs. MatrixReader – convention holds:
   In the screenshot, I compare the directional-hemispherical value from BSDF Viewer with that in the MatrixReader — both are consistent with the documented convention.

2. BSDF vs. AngularData.csv – convention breaks:

   • Case A: A beam coming from above the horizon is labeled φ = 270°, which is contrary to expectations.

   • Case B: Alternatively, a beam from below the horizon is labeled φ = 90°, which is also inconsistent.

In both screenshots, I compare the directional-hemispherical value from BSDF Viewer with the corresponding value in the *_0_AngularData.csv file.

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I would appreciate your insights, documentation references, or clarification in case I’m misinterpreting something.

Best regards,
Robert

[D. Charlie Curcija]

Hi Robert,

Thank you for submitting a detailed explanation of the issue. We are currently dealing with the release of 8.1, so our response will be slower.

Charlie 

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D. Charlie Curcija, Ph.D.                              Tel: (510) 495-2602

Lawrence Berkeley National Laboratory         Fax: (510) 486-4089

Windows & Envelope Materials Group           Cell:(510) 604-8668

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[Jacob C. Jonsson (LBNL)]

Dear Robert,

Looking at it, I think you have properly documented the inconsistency in notation. 

Do you have specific use cases for the AngularData.csv or is it possible for you to use the XML results?

Best,

Jacob

[R W]

Dear Jacob,

knowing the incosistency I can live with the data from AngularData.csv.
We are looking for absorption per layer, which I can't get from the xml file. Right?

Thank you for your response.

best regards

Robert 

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