cog ocean tutorial problems

I was having problems doing the cog’s ocean tutorial. I thought i fallowed everything correctly. I tried changing a few things so some of the numbers might be different like displacement.

Attachments

ocean.blend (555 KB)


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I fixed some of it but i am still having problems. When i put (neg) on one of the crests it causes the entire water to turn white. Does anyone know why this is happening?