Randomize seed missing for GPU height map etc.

[andypoly]

Great code, only:

You seem to be missing the line "seed = (randomizeSeed) ? Random.Range( -10000, 10000 ) : seed;" from the GenerateHeightMapGPU function which is in the CPU version, needed to add it to allow randomizing.

The thread count for height generation can be too large for older GFX cards so you have to cut it into chunks - you could test for 64k max maybe rather doing 2048*2048 for example

Also I wonder if the height map gen can be made the same for both GPU & CPU to truly test them side by side as CPU is using basic perlin noise, GPU simplex.