Settings for the red metal are on the left

Here is a closeup of the red metal on the tractor. Notice all of the nice subtle highlights. This is a combination of the material settings and the HDRI reflections.

- Reflections have been set to a dark grey
- Reflection glossies have been lowered to .75
- Fresnel reflections were enabled and Index of Refraction (IOR) was set to 2.0
- Max depth was raised to 8
- All other settings were left default.

Settings for the dark metal are on the left

Here is a closeup of the dark metal on the tractor. Notice the nice subtle highlights/reflections. This is a combination of the material settings and the HDRI reflections.

- Reflections have been set to a dark grey
- Reflection glossies have been lowered to .75
- Fresnel reflections were enabled and Index of Refraction (IOR) was set to 1.6
- Max depth was raised to 8
- All other settings were left default.