Hi Jeremy., i did As u told me but it seems no hope!!! i changed the path to v16->SetFilePrefix ("D:/ex/headsq"); and the data in the directory (D:ex\headsq) but the same problem( empty rectangle can be rendered with no data inside it and error message : ":ERROR: In C:\martink\vtk40\VTK\IO\vtkVolume16Reader.cxx, line 390" "vtkVolume16Reader (0x00EC4B20): Can't find file: D:/ex/headsq.1" may be the problem with somthing else like FilePatter or somthing like that? i'll attach u the Medical2.cxx and u can test it if u plz.. thanx jeremy any way.. yasser.. _____________________________________________________________ Free shareware + free products & services at U.S. Computer Corporation - http://www.uscomputer.net/portal.htm _____________________________________________________________ Select your own custom email address for FREE! Get you@yourchoice.com w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag