How to change texture filtering settings?


Disabling texture filtering is sometimes useful if you need very crisp look of textures or you have low-resolution textures that get blurry when seen at a grazing angle. Texture filtering is independent from Blur and Blur offset values in bitmap's settings.


To globally disable or enable texture filtering, go to Render Setup > Performance > Performance Settings, check "Enable devel/debug mode" and in "Development/Experimental Stuff" rollout find "Texmap filtering". From the list you can pick All, None or All but opacity.




Examples


1. Bitmap texture - texture filtering on.
Note visible blurriness of the texture where it's stretched on the torus knot object.



2. Bitmap texture - texture filtering off.
Note that blurriness on the torus knot object disappears.



3. Bitmap as opacity map - texture filtering off (default setting).
32 passes
Rendering time: 01:45
Rays/s: 2,724,105



4. Bitmap as opacity map - texture filtering on.
32 passes
Rendering time: 02:35
Rays/s: 1,972,307
There is little visual difference, but rendering is significantly slower when texture filtering is enabled for opacity maps.