The "Use Ground Plane" toggle is now functional. When disabled, the terrain layer spawner will say "terrain exists = false" for any point in its bounds unless there's also a Terrain Height Gradient List component with a valid entry. When enabled, it will always say "terrain exists = true", and it will return the min height of the spawner box as the ground plane if there's no valid Terrain Height Gradient List height provider.
Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>
Mike Balfour
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