Congrats, DramaKing! Nice to know that after all your work you succeeded.

One thing came to my mind -- I have not gone through the file formats, but maybe your .3ds contained some material info which Indigo then recognized and rendered? If your original .igs actually contained mesh, but it was invisible because some alpha or some other issue?

...then again, maybe I need to investigate Indigo better. Well, I need suitable scene and that (modeling) takes time.

Anyway, let us see what you achieved, ok? :)