Heightfield FFTlizer

First implementation of FFT filtering of heightfields. The main goal was to create an FFT noise filter for DEMs, but it seems to work as an interesting creative tool as well.
All with the help of that FFT Volume node that you probably never used 🙂. The ramps on the right work like an equalizer, you can see on the video how I scan trough the frequencies (left to right = higher to lower freq). 2 ramps are for vertical and horizontal frequencies. For the next iteration I need to rethink it a bit to raise the precision, cause I am getting banding on big terrains. Investigating if the precision problem comes from the Bbox remapping and/or the usage of ramps.