Number of frames in the read 3ds file. If FramesCount is 1 than the 3ds file does not contain animation data but only one static frame. To get the index of the last frame you have to subtract 1 from the FramesCount. For example if the last animation takes place from frame 0 to frame 30, than the FramesCount will return 31.

public int FramesCount { get; }