This "trial" compiles----haven't checked to see if it achieves the 
results you want. Did a DIM @ since you can't VARPTR register memory 
last time I checked. HTH

_maxFace     = 8                                  '8 faces
_maxEdge     = 6                                  '6 edges per face

DIM @ faceCubes(_maxFace,_maxEdge,4) as int

def blockfill(@faceCubes(0,0,0), sizeof(faceCubes(0,0,0)),0)