well actually to have LOD
we must modelise the 3D model
and with 3DSMAX or other
take the same model : bring number polys down export again to 3DGS
and save the model with name_1.mdl for example in
same directory as original model !

well it's very very very painfull to use LOD of 3DGS !
and there are not a lot fo people that use it because they don't want to do the very painfull process !
export 6 times (or less : i don't remember) the same model with diffrenet levels of details to game folder !
That's a real painfull work to have LOD !

Could we have a real time function to automatically precalculate LOD during level loading , or ingame for some cases ?
with the percent of detail we want and not the 6 fixed LOD of 3DGS ?
look at Torque Game Engine , it has parametrable LOD for animated models :
we specifie the percent of LOD and we have directly the result in screen(just try their demo) !

So perhaps we could have the same feature for LOD on animated MDLs
and static MDLs ?