Using a Fresnel effect on the Instance

The "Use Global Fresnel" option adds a Fresnel effect on the whole Instance.

Fresnel Settings

Element
Fresnel Sharpness	Lower values means the fresnel effect will affect more of the Terrain.
Minimum Fresnel Value	Sets the minimum opacity of the color when Fresnel dosen't affect a zone.
Maximum Opacity	Max Opacity of the Fresnel effect.
Invert Fresnel	Inverts the Fresnel effect.