Thermal Vision

something that i have seen before in mods is thermal vision. the idea is when activating it highlights any mob or block that would classify as something that produces heat. whereas something that's cold highlights in blue and the color produced if ya want it to be accurate could change depending on what you deem the temp should be for the block/item i have seen it before in mudding admittedly to a lesser extent but knowing the experience of the dev's on the project it's defiantly possible to do