there was a thread somewhere about the spear gun and the net gun from P2, i remember ppl posting up pics but can't remember wher eit is, but use the search and you'll find something, as for your last post, whats that all about?
Well according to the video game the 5 visions were as follows:
Normal vision (like we see)
Heat vision (the way they hunt using heat)
Alien vision ( the view to see aliens in the dark basically)
predator vision ( like at the end of P1)
metal/electronics vision ( a view to better see electronics and/or metal items)