Why would the ink be invisible, though? I could see them flaring up for effect when you use them, which would be neat... but unless the ink itself is clear or flesh-colored (which would still stand out if you got tanned or something)... why wouldn't it be visible?
Obviously it'd be difficult to show in game on model - but you could just as easily just tell people that your character is covered in strange, mathematical tattoos... or have them underneath clothing. No particular reason to also have them invisible.
Obviously it'd be difficult to show in game on model - but you could just as easily just tell people that your character is covered in strange, mathematical tattoos... or have them underneath clothing. No particular reason to also have them invisible.