Models from bullet examples different than standard. collision box offset from model

I was running the Bullet examples and tried to build a new script from them and noticed that the box.egg model
would not line up with the collision box that bullet built. The collision box would have 0,0,0 at it’s center while the
box.egg model would line up with it’s lower left corner on 0,0,0

After spending most of the day trying to debug this problem. I finally noticed the Bullet examples were using models bundled in the zip not the default ones.

Copying the Bullet example model/box.egg file to my project fix the origin problems.

Simply each model can have local coordinates, the center of the model is usually specified in the 3D editor.