The scene contains:
-2 Stainless Steel Waterfall,
-Swimming pool, easy edit For custom shape.
-Pool ladder.
for interior and exterior
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If you want Caustics In CORONA:
- Corona Renderer 4
- Just enable Caustics Solver,
- Render setup> performance> enable Caustics Solver.

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If you want Caustics In VRAY:
-UI Path: || Render Setup window || > GI tab
> Caustics,
-Enable caustics
-Disable the VRayMtl's Affect Shadows parameter when using caustics.
-Set Photon emit radius (V-Ray Sun)
-Increase Caustics Subvids (Vray Properties> V-Ray Sun)

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In the archive:
3Dmax 2014 (Corona + Vray) + OBJ + MTL

Grouped models for easy editing.

Scene weight:
Polys: 950.817
Verts: 658,512
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Other models of this configuration are available in my profile.
https://3dsky.org/3dmodels/show/waterfall_cobra_snail_wide_cascade_1