Wow, it’s harder than it could be and not through the material of the object itself, it may work if I do in the actor in front of (the sphere on which you need to hide the part) this is a bag of material and I will move it at the right moment,
Now I’m using a mask along with RGB and I’m removing 4 segments on the right material almost like an animation, but it didn’t work in the right place= the problem was in the incorrectly expanded faces of one material when exporting, which I which I was stupid for 2 days… I make an eye with an expanding pupil.
The video gives an interesting idea because of the smoothness and not 4 colors \ parts, but how will it be with optimization if it is a skeletal mesh during animations…