koobas.hobune.stream
Unity HDRP light measurement
Hello.
Unity HDRP allows us to set light value with physical light units (PLU). Can I get data about intensity of light represented in lux's in a specific area, like on the wall? For ex. when the light bulb is positioned near to the wall. For now I can render view from camera into material and after that it's possible to get RGB data from specific pixels. It's allows to calculate intensity of light, but still no in PLU. In one test, step by step I was increasing the value of light and in that way I was measuring RGB light intensity to look for some ratio value. I measured light in one point. For example 100 lumens gave me on the wall (in 0-1 range) 0,555359264350696 light intensity, 150 lumens gave 0,668980824476775. It is existing some formula which will help me to get the ratio which I will use to get the physical light unit?
Cheers
PS. The material on the wall: hdrp/lit, with no surfaces inputs, white color RGB Light calc: http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx
