VRay 5.2 - Are there any tutorials for pool water & caustics with the new UI which does NOT have a Fog multiplier?

[riveraj1]

I needed to make a pool (water and caustics) so I referenced an older model that was perfect. Well, it no longer works (materials are obsolete and such).
I looked up a ton of tutorials on You Tube but they all reference the older versions of vray. 5.2 doesn't have "Fog Multiplier" as an option anymore and honestly, I have no idea how to replicate a basic, good looking pool water with caustics with this new version.
I really hope I'm asking a super dumb question...I miss my pool water & caustics.

[Peter.Chaushev]

My colleague, Muhammed_Hamed , has already replied by email to your question. With his permission I'll share the same instructions here as well for the benefit of other forum members.

1. Swap Caustics to progressive mode under the Global Illumination tab.
   You can use the multiplier parameter to make the effect stronger (which applies to all lights in the scene), keep Radius at 4 (Default)
   
   
2. Make sure the scene is in real world scale (i.e. dimensions of all objects reflect actual size), for multiplier and Radius to take effect.
3. If you have Sun light in the scene, use a higher values for Photon Emit Radius. A value of 800-1000 still gets the job done but higher values will increase the quality.
   It is important to note that the photons emitted from Sunlight are centered around the center of the project (0,0,0 coordinate or the point where the X, Y and Z axes intersect).
   Ensure your caustics are set there (you can change the scene origin using SketchUp's "Axes" tool).
   
4. For refractive materials (Glass,water..etc) turn off the "Affect Shadows" option (Advanced material settings must be used to see this parameter). Then, you will fine Affect Shadows in the Refraction Section. Please turn it off(should be unchecked).
5. You need to turn on Progressive mode in Render Settings, use Min Subdivs of 16 and Max Subdivs of 100.
   
6. Add Caustics Render Elements, (from the "Render Elements" asset tab.
7. For Caustics, use Displacement for your water. this is necessary as caustic effect relies on the shape of the water surface. Using a material bump effect won't affect the topology of the refractive material and produce castics., Here I added displacement with a noise texture assigned to it:
   
8. It is expected the rendering takes longer to make Caustics sharper and to clean the noise, it should be worth for this effect
   
   Rendered image (RGB channel). A separate effect (Caustics channel) will also appear: