On 2/23/25 09:30, kurtz le pirate wrote:
>> If not a problematic version of POV-Ray, I'd bet next on something 
>> with the mesh, but...?
> 
> Yes, me too
> But the mesh is simple "concatenation" of triangles.
> 
> The max/min values off the mesh are :
> Max = < 7.00, 31.00, 7.00>
> Min = <-7.00, -1.00, -7.00>
> 
> These values are consistent with the calculations and the drawing.
> 
> No point of the triangles has a value greater than the cylinder 
> containing the mesh

I'll take you to mean no point of the triangles has a value >= a surface 
of the cylinder containing the mesh.

And, you've specified an inside_vector <> in your mesh definition? One 
NOT axis aligned (<0,0,1>) as recommended by our documentation at:

   https://wiki.povray.org/content/Reference:Mesh#Solid_Mesh

Use something more random and unlikely to run near parallel with any 
triangle's surface in your mesh (*) - there are some epsilon tolerance 
values when testing whether inside the mesh.

Bill P.

(*)- There is too a narrow / unlikely potential bug when translating a 
mesh with an originally valid inside_vector, which is fixed in the yuqk 
fork.

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