How Fresnel is working
A fresnel term is computed by the StandardMaterial in order to change the way a color is applied by using viewing angle.
For instance, you can simulate great glass or reflection effects by just using a simple fresnel. The fresnel will let you have more reflection on edges and not all on the center. You can then control if the reflection is applied on the edges or on the center. For instance, if you want the reflection on the edges (by default), you can control it using the color properties.
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