Ngons, odd sub-triangulation, how to fix?

I work at a levelterrain mesh at the moment. It has for now a few big ngons. In trueSpace this terrain doesn`t show any odd triangulation. Even when i reload a by Nvil saved mesh. In Nvil it does.

The vertices of the underlying geometry are connected in a wrong way, ignoring vertices that are part of the face. In trueSpace sometimes this happens too. In such a case it sometimes helps to use the optimize tool. Sometimes i don`t have a choice but to delete the trouble faces and to readd the face.

What is the proper way to fix this in Nvil?

That problem is from the underlying geometry produced by Nvil for rendering, so only IStonia can change that behavior.

To fix that manually, you would need to divide the n-gon. I thought that was the reason for your request for the "Quadrify n-gons"(Divide n-gons) tool?

Not only. That`s more a finishing bit

I need the Ngons for the workflow. A single Ngon is easier to select than a few dozen quads

Not only. That`s more a finishing bit

Which doesn`t work with this odd sub triangulation as i have found out now. Most trouble faces gets fixed with the Divide Ngon tool. I also tried to optimize before. But there`s enoug odd sub triangulation left to give a wrong result.

I have no problem to load this mesh in trueSpace though. All fine. No odd sub triangulation. Seems that the mesh handling of Nvil isn`t really happy with the Ngons.

Try 'Rewind'. Sometimes it may get better. My format doesn't handle concave ngons well. So you may need to devided it into a couple or more ngons.

So that`s a limit at the moment. Thanks. Rewind tool just helps partially. And not with all my Ngons. Seems that i would have to fix those by hand then.

I´ve found the Rewind tool in the customize toolshelf, and have given it a hotkey. But where is the Rewind tool located in the menu?

But where is the Rewind tool located in the menu?

By default, it is in the [sub-object Polygon] "Visual tools" and "Radial menu-> Commands" and the "Geometry" top drop down menu.

Have it. Thanks steve

Tiles, the improved 'Optimize' tool should help now. Please let me know how it works.

Thanks iStonia. The result is now much better at the front side. No trouble triangles anymore But there`s still some problem triangulatin left at the backside. As shown in the shot.

Where is the shot?

Huh? Good question. Umm, here

Here`s a small testfile attached.

I downloaded your terrain mesh. Loaded it. Select all polygons then Optimize them. The result looks good to me. Can't see any problem.

In your StillProblems.jpg, I suspect it is two overlapping polygons.

Yes.

Hm, my example shows trouble faces too. Odd that it doesn`t show to you. Are you sure that you cannot see this big face here, going through the rest of the geometry, and connected where it shouldn`t connect?