from the dancing woman avi with her clothes i think the answer to collision detect in poser 5 is a definite yes; it definitely looks like they employed it in P5. Unless they took the dancing woman and imported her to Lightwave 7 (which i know has collision detect because i use it) and then send her back to poser but i dont think so because then why advertise the avi as a P5 unveiling if it isnt totally P5 created. i think P5 does have collision detect