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« on: 2018-06-06, 22:49:42 »
So I'm just running some basic test with the Corona Sky compared with a just a plane light.
And I've noticed plane lights are tinted pink.
If you look at the image below the left side is Corona Sky/Portal and the right is Plane Light.
Both were set to 3% Noise Limit.
Tonemapping settings in frame buffer were the same for both setups (WB was at 6500).
The plane light was to set to Kelvin 6500.
The CoronaSky has been run through a Colour Correction Node with saturation set to -100.
The original idea behind the test was to see if I could get similar results to a plane at the window, using just the sky/portals and adjusting horizon blur/ground colour, and subsequently which would be quicker
With the two setups, I'd expect them to both be a shade of grey as they have an grey override material on.
But ... the plane lights are tinting pink even though everything is set to 6500 6500.
Why is this? I tested it by opening them both in Photoshop and cracking saturation up to 100.
Also, although the results differ slightly, light levels are roughly the same, light falloffs etc look a bit different. Why would the plane light be so much quicker? 3 times quicker? And why are they pink?
I actually prefer the lighting from the Corona Sky/Portal method as it gives a nicer contrast, better falloff from light/dark and generally more definition to everything. But does the difference really warrant a 3 fold increase in render time? I'd rather suffer the slight drop in quality than such a huge render time increase. I can only imagine this increases dramatically on a complex scene.
But first things first, why the magenta tint?
I should add, on numerous scenes in the past, lit with plane lights, I've found myself battling a magenta hue to renders, and always blamed my monitor or WB ....
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