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HDFView is an useful tool to edit animations exported from The Witcher 3

REDkit.

Animation file from REDkit are exported in the common HDF format. Since HDF is an open source format, it can be easily manipulated through scripting. You can inspect and edit animation files manually with tools such as HDFView.

Every .re animation file you export consists two of major parts:

• .re_anim_clip - for the animation frame transformations the for all the bones.

• .re_skeleton - for the skeleton's bone hierarchy and rig transformations for all the bones.
  

These bone transformations are in “local” bone coordinates, if you want to recreate the skeleton then you need to transform them into “world” coordinates considering all the parent rotations.

Here’s a Python code snippet for transforming a bone into “world” coordinates: