sDA Preview Results

[rgamboa]

I have generated a few LEED v4 daylight analysis reports using the sDA preview (since this cost less to run over and over) and I've received a few results where the light is disbursed in stripe patterns. This occurs throughout the building and doesn't only happen at the windows; I have tubular daylighting with IES files that are active and those are also producing the stripe pattern results. Insight results also don't always produce the stripes, sometimes I'll receive a legitimate result and the only changes made between the results will be a modification to the window size (unable to replicate a legitimate result). There are other times where one of the rooms will generate a proper result while the other rooms will have the stripes (it's usually the large apparatus bay with the 14' glass doors). Is there a setting or a something in the 3D view I need to be aware of prior to generating a report so this doesn't randomly generate the stripes? It's frustrating since these are using up our credits and its quite random when the stripes pop up. 

The mullions and the glazing do not have screens or window treatments and are set to 51% visible light transmittance (using the updated glazing materials per the Insight forums). The only lighting in the project are the tubular daylights and those are active with IES files for the project's location. As far as the model geometry, it is built rather sound with no elements that contain this type of pattern or voids within the envelope. 

This stripe pattern result has also been generated with the full sDA/ASE credit analysis. 

Any suggestions would be greatly appreciated.

Thank you

[christian.riley]

@rgamboa 

Thank you for reaching out. I am currently looking into this issue and will contact you as soon as I have any further information.

[scheerd · Accepted solution]

Results like this are usually (almost always) due to 'layered Floors' creating multiple sets of analysis points very close to each other in elevation.

This occurs when there is more than one Floor in the approximate same location on the same Level, usually when folks use the same Level to accommodate structural Floor layers and finish Floor layers.

The reason for this is that Lighting uses Floors to generate analysis points, and all Floors on selected Levels are used to generate these points.  We are working on a different way to generate the points grids to avoid this issue, but for now you should clean your model so only one set of points is generated.

The modeling best practices are described here:

https://forums.autodesk.com/t5/lighting-solar-analysis-forum/lighting-questions-start-here/td-p/9106...

David