I am adding some volumetric light to a drone shot, in which case the sun is behind the clouds, and i want sunrays to shoot out of the cloud. So far so good, i have added a tint effect, curves and a cc radial fast blur. Now, it all works fine when my CC radial fast blur mode is standard. But i really like the look when i change it to brighest. The only problem is, when it is set to "brightest" the lights beams go crazy and they keep flickering/shimmering rapidly. I actually dont need them to move. Any idea why this occurs?... I have tried a lot of things cant seem to work this out.
That's a weakness in the internal thresholding method. Simply don't use it and extract the bright regions manually on a duplicate layer using channel operations and so on. This will allow to "stabilize" the result by blurring the areas and using things like the Timewarp effect to generate inbetween smoothed frames.