How do people make the whole screen look thermal in MW3 in Infected?

[Cicero]

So the whole screen is thermal. How? What are some cheats you can use in Private Match Infected?

[IVIodern]

If your talking about the PC version, I think you can set it as a dvar
This is the dvar for MW2, not sure if it works in MW3 - they are basically the same games with minor changes anyway
doThermal()
{
self endon ( "disconnect" );
self endon ( "death" );

{
self ThermalVisionFOFOverlayOn();
}
}

self ThermalVisionFOFOverlayOn() - this is the actual dvar

If your talking about the consoles - I don't have a clue