Here you can define a curve compression codec. To set a Codec array, use the drop-down menu to select a codec. After adding a codec, additional properties will populate the field, relevant to the codec you have selected. Empty entries in the list are ignored when running bone compression on the animation sequence. However, the asset must contain a codec in order to compress curve data. For a detailed description of each available codec, and a description of their additional properties, see the Curve Compression Codec Reference documentaion.