Fresnel Effect

Fresnel Effect (Fresnel effect) is a technical term that is extremely important in the rendering and optimization of game graphics (technical art). A technology that reproduces the physical phenomenon in which the reflectance and luminous intensity of contours increase depending on the angle between the camera's line of sight and the normal (orientation) of the object's surface.

Real world analogy: When you look at the water surface from directly above, it is ``transparent and you can see the bottom'', but when you look at it from a distance, it ``reflects the scenery like a mirror''

Fresnel effect is a ``magical physical phenomenon that when you look at the surface of the water at the poolside, when you look at your feet (directly above), it is transparent and you can see the bottom, but when you look far away (diagonally), the sky and buildings appear to be reflected like a mirror.'' By applying this ``rule that changes the strength of reflection depending on the viewing angle'' to a 3D model, beautiful highlights and reflections run along the outline of the object, and a flat sphere suddenly transforms into a luxurious glass ball or a science fiction barrier.

Detailed mechanism and operating principle

Use the Fresnel Effect node in the Shader Graph to extract a contour mask from the dot product of the normal vector and the View Direction, and apply it to the material's Emission and reflection blends.