ReluxDesktop – DGP Observer (Daylight Glare Probability)

​​ ​ReluxDesktop > Measuring objects > Observer DGP (daylight glare probability)

DGP calculation in accordance with daylight standards.

07.05.2026

Explanation
 
The new European daylight standard EN 17037:2018 has introduced a glare index for daylight: the Daylight Glare Probability (DGP). Relux is proud to offer a DGP observer that can calculate and output this value. This makes it possible to calculate the glare caused by daylight entering through windows in interior spaces.

 
Adding a DGP observer
 
To add a new DGP observer, go to "insert"  > "Measuring  object"  > "DGP" .

With the first click on the floor plan or the 3D view, you create a new DGP point. The observer is placed at a standard height of 1.2 meters and direction to east (90°).

 
The new DGP observer is positioned in the scene tree and ready to set up:


 

The following parameters can be set for the DGP observer: 
Viewing direction:  this determines the viewing direction in degrees, with 0 degrees being north. The direction can also be changed interactively via "
Rotate".

Inclination: Shows the inclination of the observer between -90 and +90 degrees. With a positive angle, the observer looks upward, with a negative angle, the observer looks downward.

If a DGP observer is selected, the observer tools appear in the ribbon bar. The observer's field of vision can be checked here with an animation.


DGP observer output

After a scene has been calculated, the output for the glare rating can be opened via the output tree under " Result overview" > "Summary DGP observers" .

The output included a Legend for the values.

 


Visualization & Rendering

 
 

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