Corona Tonemap Control Map


You can use the Corona Tonemap Control map with "Affected by" Exposure/Tone mapping/LUT checkboxes disabled to exclude a texture from VFB exposure and tone mapping influence. 




Description


Transforms the texture using the inverse of current color mapping, effectively removing any postprocessing colormapping from it. This can be useful for displaying an emission / selfillum texture that exactly matches input bitmap in the resulting render under any colormapping. For this feature to work correctly, the colormapping cannot be changed after the render is started.




Examples


In these examples we will be looking at a standard setup where the view is rendered from inside the room, with a background visible outside the window:





1. Standard behavior, with no CoronaTonemapControl map used:


A typical background material setup. Corona Bitmap is plugged into a Corona Light Material with "emit light" option disabled. This setup does not involve the Corona Tonemap Control map, so the texture will be affected by VFB tone mapping, as can be seen in the examples below:



No Corona Tonemap Control map used. EV = 0.



No Corona Tonemap Control map used. EV = +3. Both the interior and the background image are brighter.



No Corona Tonemap Control map used. EV = -3. Both the interior and the background image are darker.



2. Using the CoronaTonemapControl map:


An identical background material setup, however this time the bitmap is plugged in the Corona Tonemap Control map and "Affected by Corona VFB tone mapping" option is disabled. 



Corona Tonemap Control map used. EV = 0. The result is identical to the setup which does not involve the Corona Tonemap Control map.

 


Corona Tonemap Control map used. EV = 3. The interior is much brighter due to increased EV, however the background image remains exactly the same as with EV = 0. 



Corona Tonemap Control map. EV = -3. The interior is much darker due to decreased EV, however the background image remains exactly the same as with EV = 0.