Heat visor would let you see any warm blooded being's on screen but being's that are cold blooded you would not see also if a block is hot you will see that to so anything that gives off heat you will see but if it dose not you will not see it but if there is a block in sight that is cold you will still see that block or being some vehicle to will glow if it gives off heat the way you will see these thing would be a faint glow all around it but it will not light up any blocks around it this would be a tech slot item or head gear the color of glow would depend on the being vehicle or block. Hope you like the idea feel free to post sorry about any spelling error and thank you for your time.
I don't see how this is useful if you can alread see the enemies. But if there are worlds that are cast in perpetual darkness with no way to light it up then I willgive this some support. But if that is not a feature then I don't really see a use.
Well if there is a place on your screen that is dark you will see any thing that has gives off heat in that place is I think it will help to a point but I now it will not help a lot.
It seems like a good idea but its uses are very limited. Edit 1: This could give amazing advantages on ice/snow worlds, if the enemies blend in that is. Also a race of mole people could have this as a natural ability?