The terrain was textured with GroundWiz Terrain Map. GroundWiz Planter placed trees on the GroundWiz limit map, which was used to create the ski trails. To place objects like cable car, cables, cable poles and safety net along the trails on the terrain, GroundWiz viewport feature was used so to show the terrain map in viewport. The scene was rendered with mental ray .
To see how the trails were created, refer to Tutorial 5: The Making of Ski Trails in the Forest.