Hi, > Please tell me how to build VTK4.2 under VS 7.1 .Net Did you use CMAKE to create a solution for VS 7.1 or did you convert it in VS 7.1 from an older solution? greets Ingo --- Dr.-Ing. Ingo H. de Boer Polytec GmbH Polytec-Platz 1-7, 76337 Waldbronn, Germany phone: ++49 7243 604 106 fax : ++49 7243 604 255