Reading Mike's posts about 3.2 -> 4.0 issues: There should REALLY be a "Porting from 3.2 to 4.0" document for VTK, or at least a edited changelog where only API changes are documented (bugfixes etc. are removed). This would be of invaluable assistance to anyone porting a larger Vtk app from 3.2 to 4.0 cheers, -- Tarjei Knapstad