HyperIris, looks like you're simply sending the raw vertex data as tristrips. There's separate tristrip informatio somewhere in the file which you have to use.
My mistake. I thought by pac you meant pak.
But if the file type in question was not even related metroid, why did you ask me how to open them?
I do like Brawl, and once the NTSC version is released, I'll have a look at the pac file structure (they're most likely just some sort of archiving format).