Passing subtypes as Function parameters

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Shifty Geezer

To date I've been using an array of Joints() and an array of Objects(). I realized it'd be smarter to consolidate the two, so the Object class now has a joint field...

TYPE joint
   Field pos.vector
   field joint_type
END TYPE

TYPE obj
   Field pos.vector
   Field size
   Field joint.joint
END TYPE

DIM objects.obj(10)

FOR n=0 to 10
   objects(n)=NEW obj
   objects(n)\pos.vector=NEW vector
   objects(n)\joint.joint=NEW joint
   objects(n)\joint\pos.vector=NEW vector
NEXT

Only now my function create_joint doesn't work.

FUNCTION Create_Joint(j.joint)
   IF j\joint_type
      blah blah blah
   END IF
END FUNCTION

The object 'j' = Null ; it hasn't been created when called with Create_Joint(objects(n)\joint)

How do I pass the joint sub-object as a function parameter?