public Mesh createJmeMesh(){
        //TODO return Converter.convert(bulletMesh);
        return null;
    }
Uses Bullet Physics Heightfield terrain collision system. This is MUCH faster
than using a regular mesh.
There are a couple tricks though:
   -No rotation or translation is supported.
   -The collision bbox must be centered around 0,0,0 with the height above and below the y-axis being
   equal on either side. If not, the whole collision box is shifted vertically and things don't collide
   as they should.

@author Brent Owens
jme3-jbullet/src/main/java/com/jme3/bullet/collision/shapes/HeightfieldCollisionShape.java