I need help creating an eyeball for my steve. How do I go about hiding the part of the eyeball that went out of the white area?
I had a guess it's about masks, but I have no idea how to implement it.
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You can give your eye cube a Boolean modifier. Create a second cube with a hole in it that is as big as your eye white area, make it invisible in the viewport and in render (Properties panel > Viewport Display > Dsiplay As > Wire and disable the camera icon in the Outliner), give your eye cube a Boolean modifier, mode > Difference, with the hole cube as Object. Now when you move your eyecube, the part that crosses the hole cube will be invisible: