computergee wrote:When I export it 3ds max crashes,but it still makes the file.
that's happened to me a couple of times, I've found that usualy it just creates a blank document named "Whatever.jms", you can check this by opening it in some text editor and seeing if it's blank, but the only way I could ever get it to work was by re-doing the collision model, which sometimes doesn't work, just keep re-doing it (ya, it's annoying to do) until it works, but it may never work.
As a last resort you could try using Chimp to export the collision model but I have never gotten Chimp to work and would only use it as a VERY last resort.