Calculates a new mesh for this object based on the keyframes of its
animation sub-sequence and "index". index is a value between 0 and 1
where 0 is the first keyframe and 1 the last (of the sub-sequence).
Calculates a new mesh for this object based on the keyframes of its
animation sequence and "index". index is a value between 0 and 1 where 0
is the first keyframe and 1 the last.