Hallo dear @chris , sorry if I bother you, I need to ask you, a somewhat curious question. For a project, I need to see if there could be potential glare on the outside context, caused by a glass facade. I built a script that generates the reflections coming from the position of the sun and everyt…

[image] GaetanoChristianRuvio: One thing I noticed from this research is, that according to the size of the sun path aka “sun scale”, the point of reflection changes considerably, even in the exact same minute (see the left image). If this is the case, then it sounds like you did not set up y…

Hi @Wu , If you are studying glare, then you should be running a Radiance simulation where you set up a view that you want to evaluate glare for and assign materials to the surrounding geometry. Here is a sample for a point-in-time workflow that evaluates an image and here is a sample for for an an…

Hello chris, I am very glad to get your reply. However, my research is on the effect of glass curtain walls on reflected glare in outdoor environments, not indoors. This workflow you shared is only for indoor annual glare. But what I really want to achieve is to change the material of the building …

What makes you say this? [image] Wu: This workflow you shared is only for indoor annual glare. Daylight Glare Probability is just as relevant in outdoor conditions as it is for indoor conditions. It’s not like putting a pane of glass between you and the glare source suddenly makes DGP an inv…

However, DGP indicators are usually for interior design, not for outdoor light pollution studies. It is designed to help design lighting systems for indoor environments to mitigate glare problems. For the study of outdoor Glare and light pollution, the more common indicators and methods include the …

Ok, fair enough. If you want to use CIE Glare Index (CGI), the first sample file that I linked to for point-in-tone Image based simulation will compute GCI. You see that the HB Glare Postprocess component in that files gives you CGI as an output in addition to other glare metrics like DGP. So you c…

Hello Chris, after taking your advice into consideration, I simulated the outdoor glare of the glass curtain wall under outdoor conditions. As you said, HB Glare Postprocess component can get DGI, DGP, UGR, CGI and other indicators. However, the glare comfort determined by the above indicators is on…

You can use falsecolor to render the HDR image, and toggle print extrama on, it will find the largest brightness region. Here is an image of facade reflection glare we rendered recently.The red region showed the reflection glare. [image]

Hello, thank you for your reply. So how do you quantify your glare? What evaluation index is used to evaluate the impact of light reflection on human eyes of your simulated building?

Is only my 2 cents, but many glare analysis (like Retinal Irradiance for critical impact on traffic, or potential reflected glare for residential areas, through p.e PV, Glassfasade,etc) are one of the most interesting themes wich has not been totally covered from LBT and wich had a lot of potential…

Hi. Given this fairly simple formula, running an annual irradiance simulation for a point and post processing that for each hour of the year and then running a moving sum every 30 minutes seems fairly straightforward. But some knowledge of python and grasshopper data sets is required. Regards, L…

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Comparison between reflected sun beam and potential glare from mirrored surface

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