Hello

I have problems from time to time with the net surface.

Now I am doing the shape of a font fender of a car of the 30's.
As you can imagine it is "curvy" in all directions so the curves set are quite complex into the 3d spatial environment.
Doing this it happens quite often that I have error messages saying "Bad net mapping" or "Curves are not monotonic".
I have an overall understanding of what it mean but as I said there is a fairly amount of curves in it an when I get those messages it's very time consuming process to figure out which curves (or curves) that cause the problem.

Then it's here that I need your expertise to teach me how your are doing to find in the easiest way the faultly curves.

Thanks in advance.

Thank you for your help, I will send you the file this afternoon, I will be please to know how you do to resolve it, Im sure you are doing trick by experience that I did not thought of. I have never use points in selection, Im not sure what you mean, is it endpoints when selecting or you actually add a point? Anyway try the file and share with me what you did.

Thanks

Also I invite others that read this post to submit their "tricks" because naturaly when we do something that is obvious to us, we consider that it's for other too.

You have several issues. The lines should intercept a point to be safe. The right side front needs work. The corners don't meet a point location. Also, the two lines that cross each other on the left side of the wheel well need to end at one of the V curves sort of making a triangle or three sided grid.

Yes, you can use a point as a u or V line. Not the points that define the lines but one that you add in space.