I am trying to implement some of the tips in this lookdev article, and the first thing I tried is "noising up" my spotlights with a cookie.
I have figured out that all you really have to do is add a texture to a light. But what I don't understand is how to noise it up without altering the light color. What is the normal setting for light cookies that add slight intensity variation to a light? Am I supposed to just set the color to grey? Or is color supposed to be off and RGB-to-intensity chosen? That only seems to work with colored noise. Lastly, I assume it is like Ambient Occlusion where you want to darken with the multiply mode but I can't find tutorials either way. Any help is appreciated!