Burning Eye

A random-looking eye animation driven by shading expressions (No 3D animation in it, only shader).

In the material instance, every aspect could be controlled to have different results, here below some examples:

Step 1

Basic triangular curve

(arccos(cos(time*pi))/pi

Step 1 curve: triangular wave from arccos(cos(x·π))/π

Step 1 material graph: Time and Pi into Multiply, Cosine, Arcsine, Divide

max(min((arccos(cos(time*pi))/pi), MinValue), MaxValue)

Step 2 curve: triangular wave clamped between 0.25 and 0.75

Same expression with some changes in length

Step 3 curve: clamped wave with longer flat highs and lows

The same expression is subtracted by another similar but with a different frequency

Step 4 curve: two clamped waves subtracted into a stepped line

Now the expression is subtracted again with a curve with a very low frequency to have a look-like random movement.

Step 5 curve: irregular, random-looking wave from combined expressions

The same just with clamped values

Step 6 curve: the random-looking wave with clamped values

Same expression in the material editor (Some changes in values)

Unreal material editor: ‘Hight Freq’ node group with a Base subgroup

Full Unreal material graph combining high and low frequency node groups