[Papervision3D] viewportlayers origin sort.

[John Brookes]

looking at the source
I'm guessing its for when you swap a do3d between layers (not tried that
though) or have useowncontainer and a filter pre applied.

eg
plane.useOwnContainer = true;
plane.filters = [new BlurFilter()];

planeLayer = new ViewportLayer(viewport, plane, true);

planelayer has blur filter and plane is now sorted through planelayer.
without useowncontainer that wouldn't work.
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