Found the problem with the Skin/Skeleton and the materials. It seems that there is some difficulty while asociating materials and skins. Maybe is a problem with the Skin???
Starting to program the study process of the Animation. Getting properties
Adding process of Animations. Adding Time and Value
Obtainin values from the Keys. Now it has to be able to create animation_instances correctly!
Fixing all the transforms (TODO ALSO WITH MORPH) to obtain it's reference, to be able to call for those transforms when creating animations