Once Use Chord Height Ratio is turned off for all the patches, with the Per Span settings still at 1 for U and V, we can see the the rendering is now free of edge artifacts. The only remaining problem is that the ears look a little chunky, as the geometry is only being tesselated once between each span.



So finally, after setting the U and V settings to 3/3, we have a clean rendering.



A useful tool to make sure your model's tesselation is matching up at the edges, is to turn on Display Object Tesselation for each patch. In the above image, we are seeing the tesselation for the patches when we reached the desired settings.



As a final note, setting these parameters can be time consuming. The above character has about 400 patches from head to toe, so setting the tesselation patch by patch is no fun. A useful tool for this situation, therefore, is located at Window/General Editors/Attribute Spread Sheet. Select all the patches for the character and click on the tesselation tab. By selecting an entire column by clicking on the column's tab, you can change values for multiples nodes at the same time. Very handy.