public VertexMorphKeyFrame GetVertexMorphKeyFrame( ushort index )
{
if ( animationType != VertexAnimationType.Morph )
throw new Exception( "Morph keyframes can only be created on vertex tracks of type morph, in VertexAnimationTrack::getVertexMorphKeyFrame" );
return (VertexMorphKeyFrame)keyFrameList[ index ];
}