In the archive, there is a 3Ds Max 2019 scene for Corona and V-Ray + fbx files.

The renders for the preview are made in Corona Render 12. The model uses Corona Physical Mtl. A version of Corona Render no lower than 1.5 is required. Material conversion to V-Ray was done using the V-Ray Scene Converter.

A Turbosmooth modifier is applied to all objects except the balls with materials during rendering (geometry for smoothing). Adjust the intensity as you see fit.

Polys: 128,878
Verts: 131,527

Shower panel with adjustable shower head:
https://www.wayfair.com/home-improvement/pdp/vibrantbath-5157-shower-panel-shower-system-with-adjustable-shower-head-vbth1543.html?piid=91485668&auctionId=fc7ec0b5-873e-4c05-945d-60b3cce73f38&trackingId=%7B%22adType%22%3A%22WSP%22%2C%22auctionId%22%3A%22fc7ec0b5-873e-4c05-945d-60b3cce73f38%22%7D&adTypeId=1 

For Corona Render, it is recommended to use a version no lower than 1.5, as the glossiness of the materials is set considering PBR.

For those working in V-Ray versions lower than 3.1, be careful, as the materials in the BRDF section use Microfaset GTR (GGX). If your version is older than 3.1, the BRDF field will be empty. Choose Blinn, Phong, or Ward – whichever is preferable for you.