I think what’s misleading here is the “radian” value, which technically isn’t true for UE here. See this thread https://answers.unrealengine.com/que…cted-resu.html .
The input for Sine or Cosine here is between 0 and 1, which means that after converting your angle to radians you would need to divide it again by 2 pi to normalize it. Which is exactly the same as just dividing the input by 360.
So instead of doing that:
Try that:
All white for a slope angle above 60 degrees.