Thanks for that. I am sorry to be a bit slow. Incidentaly is the 3D rendering mainly handled by the Pc'c processor or the video card. If the answer id video card then I will need to upgrade it. If not a new machine may be called for. I am using an AMD Dual Core running at 2.70 Ghz with 4 GB of ram. Would you recommend a better machine?
Once again thanks for your help.
Mark