Ok this works and works well. like Bherm said, all is correct.
A little additional info. first three lines are for cars infront of you when you drive and the mirror for the ones behind. It's not like RF2, where 12 means 12 closest around you. Moving on, the numbers are reversed. What that means: last number shows total amount of cars shown (28 in this case), third number means: of those 28, 16 are quality lod c or better, second number means: of those 16, 8 are lod B or better, and the first means: of those 8, 3 are lod A. So by default we see 3 lod A, 5 lod B, 8 lod C and 12 lod D cars in front of us.
Maybe an example. I want to see max 14 cars in front of me and max 3 in the mirror. Of those i want 3 to be lod A quality, the rest can be lod D, so the wors quality. I will put in the first line: 3,3,3,14. Behind me, all 3 can be lod D, so i put: 0,0,0,3.
Same story for shadows. If a car is not drawn, you can still see a black shadow of it on the road.
Ok, did a test. Took 30 Guerilla GT4s, as they seem to be the ones that take up most resources. Did this:
MAIN=3, 6, 9, 14
GBUFFER=3, 6, 9, 14
SHADOWS=3, 6, 9, 14
SPECTATING_MAIN=6, 20, 40, 200
SPECTATING_GBUFFER=3, 12, 24, 24
SPECTATING_SHADOWS=3, 12, 12, 24
MIRROR=2, 2, 6, 7
And yes there is a difference. It's like chosing to drive with 21 cars for example, even a little better, cause i reduced the quality of some of them. This is nice, i would before get an additional stutter here and there with 24 Gerilla gt4's, but now none with 30 of them.
And now i finally understand why mirrors are such frame killers. If they are off, AC draws only cars in front of you, if they are on, AC draws all cars in the field. Resolution, quality ,... not as important, the amount of cars behind you determins the difference in fps with mirrors on or off. Untill today that is. Now we can easily do 3 or 4 cars in the mirror, and all those in lod D, and we can see massive gains in fps. Especially if you are high in the rankings in a race.