| terrain | The Terrain object. | 
| uv | The current UV position on the terrain. | 
PaintTreesDetailsContext Returns an object representing the scattering context information.
Initializes and returns a scattering context object.
                    Use this method to create a PaintTreesDetailsContext object.
                    Use this object to track neighboring terrains and their UVs.
                    Additional resources: PaintDetailsToolUtility.FindDetailPrototype