Edit BIOEngine.ini located in MyDoc\Bioware\Mass Effect\Config
If these settings change nothing, you may also need to make the same edits to DefaultEngine.ini in <Game instal path>\Mass Effect\biogame\config

[SystemSettings]
Trilinear=TRUE

[TextureLODSettings]
//TEXTUREGROUP_Character=(MinLODSize=1024,MaxLODSize =4096,LODBias=0)
//TEXTUREGROUP_CharacterNormalMap=(MinLODSize=1024,M axLODSize=4096,LODBias=0)
//TEXTUREGROUP_Effects=(MinLODSize=1024,MaxLODSize=4 096,LODBias=0)
TEXTUREGROUP_LightAndShadowMap=(MinLODSize=1024,Ma xLODSize=4096,LODBias=0)
TEXTUREGROUP_RenderTarget=(MinLODSize=8,MaxLODSize =4096,LODBias=0)
//TEXTUREGROUP_Skybox=(MinLODSize=1024,MaxLODSize=40 96,LODBias=0)
//TEXTUREGROUP_UI=(MinLODSize=1024,MaxLODSize=4096,L ODBias=0)
//TEXTUREGROUP_Vehicle=(MinLODSize=1024,MaxLODSize=4 096,LODBias=0)
//TEXTUREGROUP_VehicleNormalMap=(MinLODSize=1024,Max LODSize=4096,LODBias=0)
//TEXTUREGROUP_Weapon=(MinLODSize=1024,MaxLODSize=40 96,LODBias=0)
//TEXTUREGROUP_WeaponNormalMap=(MinLODSize=1024,MaxL ODSize=4096,LODBias=0)
TEXTUREGROUP_Character_Diff=(MinLODSize=512,MaxLOD Size=512,LODBias=0)
TEXTUREGROUP_Character_Norm=(MinLODSize=512,MaxLOD Size=512,LODBias=0)
TEXTUREGROUP_Character_Spec=(MinLODSize=256,MaxLOD Size=256,LODBias=0)