Also regarding to an earlier discussion of Nishita being too greenish and blueish in Spectral Cycles, I want to share some of my latest findings. I know you guys told me that it was something about shifting the white point from Iluminant E to D65 and it is what should happen so it is not an issue. But I could not get my head over it and continued testing. I am not here to argue anything, just sharing my findings.
So finding number one, this does not have to do with the intensities. This was because of @nacioss suggesting this:
So I did the testing by simply clamping the brightness
And I also tried to use the brighness of some HDRIs and the color of the clamped Nishita:
Difference still very visible, so it is not about the brighness of the texture.
Finding number two, this is not just Nishita, all three sky textures have the same situation. But HDRIs do not have the same issue. Here is the comparison for the other 2 textures plus an HDRI:
The HDRI is almost identical at least for the first glance, while the other 2 textures are far more obvious, therefore I conclude that rather than Nishita, something is with the Sky Texture node here.
Finding number 3, Nishita baked into HDRI comparison. After concluding that HDRIs does not have the same situation, I tried slapping the Nishita texture onto a UV Sphere and bake it into exr texture. The result is rather surprising.
So start with good old Sky Texture:
Expected difference.
Now let’s see the second emission node, which was baked in RGB Cycles:
Kind of surprising, they are almost identical.
Let’s see the third emission node, with the exr texture baked in Spectral Cycles:
The two branches are still identical, but… isn’t it greener and bluer than the second one?
I think this is an interesting finding, and I still think there is something going on with the Sky Texture node. The exr connected to the second emission node is basically the data outputed by the Sky Texture node in RGB Cycles, and the exr connected to the third emission node is the data of the Spectral branch’s Sky Texture. The fact that the two EXRs are different, but using the same EXR in both branches make the two branches identical, I think is enough to prove that something is going on with the Sky Texture node that is causing this phenomenon.
I just want to share my finding, if you guys still think this is not an issue, then it’s fine then. You guys are the experts after all, not me.
And here is the link of the blend file with the baked Nishita EXRs: