I don't think reactor does what you think it's doing...though I don't know for sure. Anyway, maybe you just want to auto-generate a convex hull similar to UDK and be able to edit it? Try this out for size -> http://www.scriptspot.com/3ds-max/scripts/convex-hull
Yeah I tried that before with a mesh and when I exported it to UDK it completely chopped it up into 56 different collision primitives... I've still yet to figure out why that's happening... we'll see what happens with this one. Cman2k, you're my new hero! This script is freaking awesome! Wish it had control options though…
Yeah reactor will create convex hulls for meshes that you want to animate in a scene (I've done it) and then you can "render" out the physics in a separate window and then have reactor update your scene inside max. I've used this for creating really cool looking ruins of some building models I've made... Really awesome!…