Forest Colour or RailClone Colour does not work in Arnold

Problem​

Forest Colour or RailClone Colour does not work in Arnold.

Solution​

For Arnold to work with many of 3ds Max's built-in and 3rd party maps and materials, it is necessary to enable support from the settings. To do this

1. Open the Render Settings.

2. Select the System tab

3. Check the option to enable Legacy 3ds Max Map Support.