Editing Surface adds unexpected points.

[AllenJessup]

I've been struggling with this for a while. I have an old complex surface. I notice a problem with it and make edits. The next time I open the drawing there are more problems to fix.

One of the problems is that I keep getting Surface points that are either duplicated or shifted. I finally saw a point duplicated and shifted and managed to recreate the action. I don't remember seeing this happen in any other Surface.

Watch a second point being created just below the one I pick for a new vertex on the featurelines.

Here you can see a couple of points that are duplicated and one that looks shifted from the original breakline (cyan).

I'm keeping any featurelines I'm adding in their own site for now. So it isn't a crossing featureline problem. I'm hoping that there is an unknown (to me) variable that is making the program add these point. 

[NPALEN]

In your surface properties and under the "Definition" tab, do you have any "Minimize Flat Areas" operations listed? This surface edit has added points to my surface before in order to break up triangles that have no slope. I have stopped using it because it adds so many points that I do not want in my surface.

[AllenJessup]

I don't see any. But it's a very long list. I rarely ever use that command. Maybe once and not on this surface that I know of. But that was a good idea.

[AllenJessup]

I've been working with Autodesk Support. Their answer is to upgrade to 2020. We have a subscription. So I've created a deployment and tested it on my computer. The extra points are not created when the surface is edited it 2020 as far as I've seen.

[M_c3d]

Hi@AllenJessup 

I see that issue a lot, in all versions 2017-2020.

Usually a user has pasted a corridor surface into a proposed levels surface, editied the points it in the proposed levels surface, then realised its no longer full dynamic to the corridor and pastes the corridor back in to the proposed levels surface, which then leaves the extra points.

[AllenJessup]

In my case it's in existing surfaces. Autodesk Support confirmed it in (I believe) 2017-2019. It doesn't seem to occur in 2020. (So far.)

[themadcadlad]

"Their answer is to upgrade to 2020." 

That is pure grifter bs. I'm on C3D 2025 and the same nonsense is happening. If corporations are people, then Autodesk belongs in jail.

[douglas_sellars]

I have this happen all the time with older surfaces, but it usually seems to be that Civil3D is re-adding old points that were previously deleted from the surface, so the newly added point will create triangles connecting to points that have long since been deleted.