Tangent space normal maps with basis universal ETC1s mode compression suffer greatly from artifacts. A better solution is to only encode the X and Y components (red and green channel) into the color and alpha slices respectively.
This can be done with the -separate_rg_to_color_alpha option, which works for both toktx and basisu.
KtxUnity should be able to load and transcode such textures correctly. Optionally this is auto-detected.
Note: Users have to be aware of this format and adopt shaders accordingly (the missing Z component has to be restored in some way).
Tangent space normal maps with basis universal ETC1s mode compression suffer greatly from artifacts. A better solution is to only encode the X and Y components (red and green channel) into the color and alpha slices respectively.
This can be done with the
-separate_rg_to_color_alphaoption, which works for bothtoktxandbasisu.KtxUnity should be able to load and transcode such textures correctly. Optionally this is auto-detected.
Note: Users have to be aware of this format and adopt shaders accordingly (the missing Z component has to be restored in some way).
A workaround is to use UASTC mode.