Quote - Markonan,

The first image I gave you is what the mapping of the cylinder looks like when loaded in UVmapper Classic. At the right, I showed the settings I took for planar mapping.

It turned into vertical rows just like what you shown with the caps hidden. The obj I posted is already planar mapped. When I imported it to poser. The artifacts are still there.

Sorry for the confusion.
**
Whatever mapping software you are using. Its planar projection might have done something to it that took away the artifacts. Just like bagginsbill's blender import/export.**

(No problem in regards to any confusion.  If you are ever running low on "Confusion" send me a PM and I'll give you some of my surplus!) ;)

Hex may be inherently fixing this issue with your cylinder?  That is VERY possible.  However, the issue has moved to a much broader one.

While we know How your cylinder can be fixed, we don't know Why it can be fixed.

My aim was to try to figure out, exactly, "How" to fix such a problem and what conditions cause it.  I think I can do that on demand now.  But, I still don't know "Why" it behaves as it does.

It was suspected that the "ripping" artifact issue along the top of the cylinder was with normals.  However, that doesn't appear to be the case.   Notice in Illustration #7, the large render of a cylinder with a normals problem.  Here, there is no "ripping" of shadows (could smooth shading maybe but, only if it has something to do with vertex normals or their generation from face normals averages).  That problem was solved, as previous experiments support, with a choice of Projection Map and not a choice of splitting verts or otherwise scrubbing the model clean using another process.

So, while your cylinder is related to the issue, what it opened up for me is a new can of worms - Specifically, why are these models rendering differently with different projection maps and why does Planar mapping seem to correct every instance of "ripping?"   Only in two occassions did other projections yield satisfactory results using their defaults, without manipulation.  And, even bad UVMap manipulation (by hand) would not cause the Planar Projected UVMap have any ripping results whatsoever.

You cylinder was just the tip of the iceberg.  :)  Of course, it may just be an "ice-cube in a teacup" type of situation here considering I am not a professional in this field.  I may be misinterpreting something or there may be something else going on I am not aware of.  But, consistent and reproduceable experimental results tend to imply that there is something significant going on here that others may wish to be aware of.