November 25, 2013, 01:41:39 am
Push the terrain below the level of the patio.
Pushing the terrain below 0 height where buildings have lower levels/basements is always needed if the camera is in view of lower regions. And, then you include a landscape surface that is set to Landscape Material to hide any indents/lowered parts of the terrain.
As the terrain is below the height of the patio surface, and that surface is not a Landscape Material, then no grass is drawn on it.
(excuse my bad SkUp modelling)