Actually, I wondered recently what the Exposure value represented (seconds, etc.), precisely because I was unable to match the EXIF dataabstrax wrote:But the point is that it didn't match any EXIF data, because there is one important component missing: Exposure time. An exposure of 1 doesn't mean 1ms or something. In the past it didn't match anything, now the colour of a texture emitter is reproduced exactly if the exposure is 1 and camera response curves and vignette are disabled. And obviously, this doesn't have anything to do with EXIF data.Phil_RA wrote:Good news all around, except that you should keep Exposure, F/Stop, ISO, as an option. It's useful to match the values from a photo's EXIF data, for example of you want to use the same values as those used to make an HDR image.
A reason why this is really useful is that if you want to be physically correct, you need some sort of reference to match. Currently, people set incorrect light intensities and then just boost the exposure.
If we think like this, we might as well remove the efficiency and power and just have a meaningless "intensity" parameter, but all of this makes it more difficult to be physically correct.
I'll get the new version. BTW thanks for adding the diffuse-roughness, good addition!