Figure 5

Place hemi-cube over element Ei
FOR each element Ej ¹ Ei
 Fij = 0
 FOR each hemi-cube face
  Project element onto hemi-cube face
  FOR each patch Pk
   IF patch covered
    Fij = Fij + DFk
   ENDIF
  ENDFOR
 ENDFOR
 Fjtotal = Fjtotal + Fiunsent FijRj
 Fjunsent = Fjunsent + Fiunsent FijRj
ENDFOR