Creating Textures

You can use the command line tools toktx (comes with KTX-Software) to create KTX v2.0 files and basisu (part of Basis Universal) to create .basis files.

The default texture orientation of both of those tools (right-down) does not match Unity's orientation (right-up). To counter-act, you can provide a parameter to flip textures in the vertical axis (Y). This is recommended, if you use the textures in Unity only. The parameters are:

  • --lower_left_maps_to_s0t0 for toktx
  • --y_flip for basisu

Example usage:

# For KTX files:
# Create regular KTX file from an input image
toktx --bcmp regular.ktx2 input.png
# Create a y-flipped KTX file, fit for Unity out of the box
toktx --lower_left_maps_to_s0t0 --bcmp unity_flipped.ktx2 input.png


# For Basis files:
# Create regular basis file from an input image
basisu -output_file regular.basis input.png
# Create a y-flipped basis file, fit for Unity out of the box
basisu -y_flip -output_file unity_flipped.basis input.png

If changing the orientation of your texture files is not an option, you can correct it by applying it flipped at run-time (see How To).