The tile is disappearing because its bounding volume is pretty small and is going out of view. It is the red area in the picture below (shown with tileset.debugShowBoundingVolume = true). Try making it larger to encompass the full model.
The tile is disappearing because its bounding volume is pretty small and is going out of view. It is the red area in the picture below (shown with tileset.debugShowBoundingVolume = true). Try making it larger to encompass the full model.