when using the thermal optics (Black Hot or White Hot, doesn't matter) in cars like the Hunter at night (just from Dezember to April) you are unable to see anything beside vehicles or infantry. There's no visual of any surroundings or e.g. the explosions of the cars grenade launcher. So after all you just get a black or white screen with just vehicles or infantry shown.
- Legacy ID
To reproduce this I just placed an car with mounted gun like the Hunter GMG, set the date to a month from Dezember to April and set the time to 00:00.
I do not think this is an issue. FLIR in real life will have trouble under certain conditions to resolve images, which is a condition that insurgents in Afghanistan have been known to make use of, trying to move at times when it is less likely that thermal vision equipment of the coalition works.
FLIR is not magic, in fact, it should probably be nerfed a little bit more, according to environmental conditions and irl limitations of the equipment.
Military grade thermal imaging equipment is very powerful yet expensive and unless BI plan on simulating budget cuts, this issue needs to be fixed. What you are referring to, the daytime when thermal imaging becomes tricky usually doesn't last very long. The high contrast and the resulting easy spotting of enemies even over large distances is another issue though.
Set the date to May, same time; you have a similar setting (night, low moon) but there isn't an issue, you can see everything as it should be.