I've implemented radix-2 FFT on the gpu and that's the result that I've got so far (for the lod algorithm I'm using geometry clipmap with toroidal update on).
sometime It looks like that the waves instead of doing a smooth and gentle fade off, they just looks like they cut off with a discontinuity ... If you look at the 1st video at 0:18 I show the heightmap update along with the related spectrum. The heightmap looks ok to me (it actually has choppiness in as well, as you can see because it's colored).
Note: there is choppiness as well (which I tried to disable it to see if that was the problem, but it wasn't).
can someone shed some light or has some ideas ?
Also what could be a good rule of thumb to follow to try different settings for the water ?
I've got grid size in meters (MxN) and grid resolution which is the actual heightmap res.
wind speed V
wind direction W
PS.: if I increase V the speed of the simulation is still the same. I guess V will generate just bigger waves ? ...
Thanks in advance