I liked the muddy water effect that comes from assigning texture instead of color. I assigned this texture to the water. Muddy water is similar to real water in nature, there is always a slightly opaque environment, the same in giant aquariums. There is almost no completely transparent water. But it's very interesting!! The Ni parameter completely stopped working when the model has a texture assigned. Now the fish is again without distortion. It hangs as if in a fog, not in the water. Remember this effect, it is very important for realism. Through the aquarium, you can now see the background with the figures of people without displacement, before everything was greatly distorted (when there was COLOR). The hemisphere inside illuminates the inside of the wall of the water box, in order to get a visible upper horizontal cloudy surface, I placed another flat hemisphere above the water. Otherwise, this surface will not exist!
