[Therion] Loch giving strange artifacts

[Benedikt Hallinger]

Hello,
in my loch model i get some strange artefacts.

It seems that the further-away objects are rendered in front of the 
nearer-in-front objects.
I would expect that the passages far away would be covered by those in the 
front of the camera (as is the case where i did not yet have scraps and only 
the centerline is present... look at the screenshot)

What am i doing wrong?
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