This is how i think the main riff goes. The others say to start at 0 and hammer 3, but 
i play it it sounds better 1h3
*numbers like 111 aren't 111th fret, it's 1st as a triplet


g---------------------------------------------|
d---------------------------------------------|
a-------------------------------6-------------|
e--1h3-1h3-1h3-1h3-1h3-1h3-1h3----------------|
repeat throughout most of song)

then when the vocals/guitar come in its this

g----------------------------------------------|
d----------------------------------------------|
a-1-111-111-111-1-1-1-1-1-s131313131313131313--|
e----------------------------------------------|

*13th
g-----------------------------------------------|
d-----------------------------------------------|
a-131313-121212-111111-101010-9-7h9-7h9-7h9-7h9-|
e-----------------------------------------------|

g----------------------------------------------|
d----------------------------------------------|
a-7h9-7h9-13-9-7h9-7h9-7h9-7h9-7h9-7h9-13------|
e----------------------------------------------|

then it slides back down to the first part, and repeats through most of the song, and i 
figured out the rest...but have fun with this!