Renders for the preview were made in Corona Render 9. On the Corona Legacy Mtl.

Climbing wall size: 3800x2200x2000 mm

Objects are logically attached, materials and textures have logical names.
In the max file, objects are grouped. A stack with TurboSmooth is opened for hooks. Render Iters:1 is set.
Colors can be changed via CoronaColor.

For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR