Now I managed to get It to work, my populations follow the patchs very nice. In the beginning of the tutorial you mentioned how to create roads/patchs in VUE. I do not posess GeoLogic2 so I have to stick to VUE for this purpose. In witch tutorial do you describe this function. For example i need a patch to follow a slope. I use Inventor in my proffession so I can quiet easy create my own objects.