Big object disappears to early

Hi. I have create an object that is 200 m wide, 500 m tall and 1700 m long.
The object also has 6 different LODs. In developer mode I have checked it with
LOD debug. All levels of detail work fine and they are in correct way like SDK
describes. I use the latest version of Blender (3.4). Scale is at 1. My
problem: If I go far away (approx 30 km) the last LOD model disappears while
the screen size of the object is 9.6 percent. Other small objects (around my
large one) disappeare at correct screen size of 0.5 percent. Fakt 1. If I
scale down my large object with factor 0.1 (20 m wide, 50 m tall, 170 m long)
it disappears in correct way at a screen size of 0.5. Fact 2. If I enable →
freeze the actual LOD <- the large object disappears right at screen size 0.5
(nearly visible). Yes it is freezed and the size is only a feeling. Fact 3. If
I scale up my model at factor 10 (2000 m wide, 5000 m tall and 17000 m long)
it disappears at a screen size of 113 percent. So my question is clear. Why
small (normal sized) objects are disappearing the right way (if everything is
correct in LOD) at a screen size of 0.5? And why larger objects, if they are
normally visible at let’s say 200 km disappearing at 30 - 50 km? Sorry for
mistakes Greetings Torsten

Could it be possible your bounding box is not correct in Blender? This can
causes games to think the object is larger or smaller than what you see. In
3ds max we several options to reset bounding box. My other thought is that
your object is so big the detection for distance is based on the outside of
the bounding box and not center so this would be the offset you are seeing.

Hi. Thx for your comment. No the bounding box is correct. It seems to me, that
MSFS has a special distance, were all objects disappear. I have tested it with
different sized cubes. Every cube disappears in 30 km.

Hello , Indeed, there is a maximum distance from which the object will be
unloaded and it is hard-coded in the sim. We do not plan to change this at the
moment. Regards, Boris

What about instead a way to make a large object to be unloaded before the 30km
mark? My cables/wires can be very long, and I really don’t need them to be
visible from long distance, thus a way to unload a large object from memory
could really enahnce the performance of my add-ons!