On 4-12-2017 16:47, clipka wrote:
> My guess would be that your mesh is "closed" in a different sense than
> what would constitute a "closed" mesh in the sense POV-Ray interprets it.
> 

Problem SOLVED (I guess).

To close the mesh, I left a number of quadrangular new surfaces. I 
re-triangulated the model and the spikes disappeared. No entirely sure 
/why/ this happened though; I do not remember having met this before.

-- 
Thomas

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