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 the bitmap's settings.


To globally disable or enable texture filtering, go to the "Development/Experimental Stuff" rollout and find "Texmap filtering". From the list you can pick All, None or All but opacity.




Examples


1. Bitmap texture - texture filtering on (All).

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



2. Bitmap texture - texture filtering off (None).

Note that blurriness on the torus knot object disappears.



3. Bitmap as opacity map - texture filtering off (All but opacity - default setting).

32 passes

Rendering time: 01:45

Rays/s: 2,724,105



4. Bitmap as opacity map - texture filtering on (All).

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.