Hi, You can this->vtkImage3D->GetPointData()->GetScalars()->SetValue(i, value); or, assuming image type is short short *data = this->vtkImage3D->GetScalarPointer(), then... Cheers, Yixun Liu -------------- next part -------------- An HTML attachment was scrubbed... URL: http://public.kitware.com/pipermail/vtkusers/attachments/20060822/1a31eee8/attachment.html