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Doesnt the clip_range do that already?



Yes... it does and fog too but U may write simple loop code if vec_dist > something entity is invisible too

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What's LOD?



It's part of the engine which one will change models depends of distance from camera. To do it U must create less detailed etntitys and named it with _01 or _02... etc; Search forum for LOD system
The point is to see very detailed models only when they are close to camera, and change to less detailed one when far away


Never say never.