My mesh pinched when I smoothed. I am using 2.8 so I just r-clicked and Shade Smooth. I don't think that is the cause, but just in case.
I recalculated normals. I verified that there is only on Vert in that corner. I moved it around. I just can't figure it out.

The edge in the center of the image is getting curved by the subsurf modifier, causing all kinds of chaos. Left alone, it causes a weird shading artifact. But when adding a loop cut as a holding edge, it tosses the new vertex out along that curve (in the same plane), causing the geometry to hang over the corner:

No amount of jiggling the vertices or recalculating normals seems to fix it. Setting the edge's Crease strength to 1 keeps it straight but causes more shading artifacts at the two vertices. As far as I can see, my geometry in that area is identical to yours.

Is there some way to fix that edge?

These black shadow lines appears on certain edge loops, and I am unable to get rid off them. Is it a common mistake on my end and I can fix it easily, or do I have to redo those areas?

When you increase the Mean crease on an edge is it only visually changed, like smooth shading? Or does it stay once you apply the subdivision modifier? For example if I were to create a model with the intention of 3D Printing it, when I export the file as an STL obviously the smooth shading would not carry over to the STL file. But if I had a Subdivision modifier and applied it during export it would smooth the file. So would the creased edges stay sharp at that point?

Can't understand why this I guess "artifacts" appear, and how correctly get rid of it

Hi Jonathan!

Can the height difference between two vertex loops cause strange results?

https://i.imgur.com/OfAdsag.png

The first picture is what I got the first time I applied the subsurf modifier. After that, what I did to correct those shapes was deleting some vertex loops and extruding new loops from the closest ones. I don't know if the height was really the problem - on those faces circled by blue you can see that there's a vertex not on the same height as the others but the shape is not affected, making instead a concave edge - but this is my best guess at the moment.

Can you tell me anything that can cause the same strange results?

Thank you so much! (and sorry if my question seems a little confuse. English is not my first language)







 

I already downloaded the file. I also would like to download the course files but it says, "could not be downloaded". I do not know why it is blocking me

Hey Jonathan, I just finished watching these series of tutorials and I would like to do the exercise. what do I need to do to be able to download the files?. thank you

You said you're going to talk about it in the next lesson but this is the final lesson. Am I missing something?