The latest version of the FM2 simulation is now working, with animated waves computed using the iFFT method. I am getting 60 fps. But, if others are not, I can crank down some of the settings.
The nearest grids use both a normal map and displacement map. The farthest grids use only a normal map. As you can see, the transition between the two seems fairly seamless.
Now that this seems to be working, I plan to try to break the program into modules and to add an AI opponent.
ADDITION
The simulation has been updated to r152 and incorporates the new ColorManagement changes which are supposed to improve colors and shading. (You may have to hit “reload” to see it.) To compare, here is the old r150 version. I believe r152 a vast improvement since the waves now appear sharper and even more detailed.
EDIT
The increased level of detail also caused a reappearance of the tiling issue. So I have doubled the size of the grids. It still looks sharper and more detailed than the r150 version.
Here is a side-by-side comparison of waves generated in the Dunkirk movie and waves generated in three.js using the modified Li-Albert-Bouny iFFT Wave Generator.