This case seems to need some files ( "quarter.1" and "quarter.2" and "quarter.3"). However my installed VTK(version 4.2) dose't have this files. And I can't find directry like "DATADIR/headsq/quarter" Could you please give me your advice? OS:whindows 2000 VTK:version4.2 Compiler:Microsoft visual stadio 6.0 Thanks, Yuji Yoshimoto