On 4-12-2017 16:47, clipka wrote:
> Am 04.12.2017 um 13:40 schrieb Thomas de Groot:
>> 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.
> 

I agree about those eye orbits and balls. However, I deleted the eye 
balls and closed the eye orbits. So, strictly speaking, the mesh is 
completely 'closed'.

Remembering a more ancient discussion, I change the inside vector of the 
mesh from the standard (Poseray-generated) <0,0,1> to <1,0,1>. 
Interestingly, that generates an additional spike (see image).

-- 
Thomas

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