PositionInterpolator { eventIn SFFloat set_fraction exposedField MFFloat key [] exposedField MFVec3f keyValue [] eventOut SFVec3f value_changed }Explanation :
This node linearly interpolates among a set of SFVec3f values. This is appropriate for interpolating a translation. The vectors are interpreted as absolute positions in object space. The keyValue field must contain exactly as many values as in the key field.