Changes compared to old (Ogre) water:
- Uses depth-texture readback to handle the underwater fog in the water shader, instead of handling it in the object shader
- Different clipping mechanism (glClipPlane instead of a skewed viewing frustum)
- Fixed bug where the reflection camera would look strange when the viewer was very close to the water surface
- Toned down light scattering, made the waterColor a bit darker at night
- Fixed flipped water normals and strange resulting logic in the shader
Still to do: see comments...