Am 04.12.2017 um 13:40 schrieb Thomas de Groot:
> On 4-12-2017 9:11, Thomas de Groot wrote:
>> On 3-12-2017 14:17, Bald Eagle wrote:
>>> Hey!
>>> I like the results you're getting.
>>> In fact, I like the holes in the mesh so much, that maybe you could
>>> think about
>>> exploiting that effect by randomly creating holes in the mesh to give a
>>> "spiking" effect - I think that would be an excellent Gormley-inspired
>>> methodology.
>>
>> For the time being I treat them as artefacts.
>>
> 
> I don't know what those spikes represent finally. I closed the model and
> still the eyes show them, except if I increase minutely the Step
> parameter. Any idea?

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.

For instance, a human figure mesh may be comprised of (1) a surface
representing the skin, which is open at the eyes, and (2) a pair of
convex spheres representing the eyeballs.

In such a setup, no ray could travel from the "inside" of the figure's
head to the outside without encountering /at least one/ surface, which
you might consider "closed".

However, in POV-Ray's sense a mesh is only "closed" if a ray traveling
from the "inside" of the figure's head to the outside always encounters
an /odd number/ of surfaces.

This is the case if, and only if, there are no "open edges" in the mesh,
i.e. each edge joins an even number of triangles.

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