A SceneLOD is a LOD that can be applied to Assembly hierarchies rather than individual models.
Same as a LODNode except its reference point is implicitly the centre of its bounding sphere.
bool - When enabled, the child assemblies are drawn according to the InOut distance
vec2 - X = distance from view at which this LOD is active, Y = distance at which the LOD is hidden. e.g. (1,5) is visible when the view is between 1 and 5 metres from the object. Use Y=-1 for infinity (LOD never disappears)
bool - When true, the reference point is the centre of the parent assembly bounding sphere.