Thanks for the info. I've had problems with color differences between Unreal and Photoshop before; I'll look into the sRGB setting. And thank you for pointing out the VectorToRadialValue function. It helped me optimize my own function, and I think mine might be a bit better than UDK's now. UDK's function is 61/107/49…
My entry for the THU Golden Ticket Challenge hosted on Artstation :) Submission page: https://www.artstation.com/contests/thu-2018/challenges/49/submissions/31331
PolyHertz, the released tool is free for anyone for commercial purpose for now. The possible future price for commercial use stated on the website was and is $49 (one time purchase).