Well the problem with the example shown here is that the polygon on the right has a valid edge connection path between all 3 vertices on the right. If you use connect it will always connect those. Although looking at the script that was posted, it should work, since it should only process each selected face one at a time...
That's weird. I've tried manually triangulating a model using connect verts, and it did just use follow the same pattern as the internal triangulation. No nonsense like your image on the right.
Connect works fine, just select the two verts where you want the edge to appear, that's how I do it. You can also do like in Maya with the cut tool. If you look at other macros that max ships with you mimic the formatting of the header you can find it under customize and add a shortcut it. I think there are scripts that…
Yeah sorry guys I wasn't very clear, I'm needed to do this on a ton of objects so while things like selecting vertex pairs and connecting works it just took to much time. Converting to patch triangulates the whole object, what might be unclear was that I wanted only the selected faces to be triangulated. Sage: Ok, I will…