Blurry Textures in Unreal Engine
Low-res mips that never sharpen
Also known as: Texture blurry Unreal · Low resolution textures in Unreal · Texture streaming pool · Mip bias · Never Stream
Quick answer
Textures look blurry in Unreal Engine when the engine shows a low mip level instead of the full-resolution one, usually because the texture streaming pool is full or the texture is set to stream aggressively. The quick fixes are to increase the streaming pool size, enable Never Stream on important textures, and check that the texture's LOD Bias is 0. Also confirm that the source image is large enough for the size of the object on screen.
How to fix it
Run stat streaming in the editor to see whether you are over the pool budget, and raise it with the r.Streaming.PoolSize console variable if your hardware allows. Reserve Never Stream for a few hero textures, since turning streaming off for everything wastes memory. If the blur remains, the texel density of the asset is the cause: a 512 texture on a large wall looks soft however you set streaming, so raise the resolution or add a tiling detail texture.