Instructions to activate software emulation mode
(only needed if you do not have a GeForce3 !!!)

1. Download and install NVidia driver version >=10.80
2. Download and install GeForce Tweak Utility
3. Activate NV20 emulation mode

4. Start volume renderer
5. Each time press 'space' to render (takes seconds up to several minutes!)

Klaus Engel, 20. Apr 2001