Changing the display from radiance (kWh/m2) to luminance (cd/m2) on sky dome

[Alex_Huang]

Dear All,

I am trying to get the value of each patch of CIE Standard Skies. I found a web application that Andrew Marsh made. (PD: CIE Sky Model) It allows me to choose to display sky radiance (W/m2) or sky luminance (cd/m2).

It is a convenient tool, but I want to get all the values of the patches as a list, and not just click each patch one by one and then record them, so I tried to use the component “LB Sky Dome”. The unit of the results are kWh/m2, but I want to change them into cd/m2. Is it possible to achieve this?

Your support is highly appreciated.

Thank you,
Alex

[chris]

Hi @Alex_Huang ,

We haven’t yet added support for rending skies in the LBT plugin but you can use the Legacy “Honeybee_Watch the Sky” component to visualize illuminance-based skies like you can see discussed here:

Watch the Sky HDR output units?

Hi @IasonBournas, The first file that you get is the output from Radiance rpict. This is the very bright, white image that you will get as a result. Human sensitivity is then applied to the HDR image to get a represenation of the human eye response, which gives you an image that you can visualize. Last, the “_f” file is just a horizontal flip of the image to make the sky look as if seen from above. The easiest way to output the falsecolor would be to run Honeybee_Falsecolor and use the first …