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I have about 4 weeks of Blender knowledge.

Why is the line shown in the Bottom red circle not affected by the Subdiv modifier? It feels like it should be, but it leaves a sharp edge? I can't make sense of it.

enter image description here

Secondly. I want to keep the triangle shape shown in blue (top image), but from what I understand I have to turn all my faces into quads. My first solution is shown in the bottom image, but if I take that route I lose the triangular corner and introduce all sorts of wackiness when it comes to edge loops. Is there a simple solution?

The other highlighted problems are minor: There's a weird hitch in the edge shown in the top red circle which I can't solve without breaking something else. I'd also like to move the edge shown by the dotted black line to the yellow line, but, again, as soon as I attempt it, the models turns into a horror show.

.Blend files on Gdrive [1.6mb] (Pre and post edge looped) with references images if anyone's feeling extra charitable.

Link to the reference images I'm using on flickr

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enter image description here

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2 Answers 2

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You have adjacent faces but they are actually separate, so it cuts the effect of the Subdivision Surface, see:

enter image description here

or:

enter image description here

You need to join these faces:

enter image description here

and:

enter image description here

As for the tri, in my opinion you can keep tris as long as the faces render correctly. Here you can bevel (CtrlB) all the edges that are supposed to stay sharp. First select the edges that are supposed to be sharp, in your case switch to Edge Select in order to avoid the selection of the vertical edges along the handle:

enter image description here

enter image description here

enter image description here

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    $\begingroup$ Wow, you are amazing! How do you answer all these questions so fast and so thoroughly? $\endgroup$
    – BlenderMaster15
    Commented Apr 26, 2022 at 13:25
  • $\begingroup$ @BlenderMaster15 Nobody knows and we're too afraid to ask... $\endgroup$
    – jachym michal
    Commented Apr 26, 2022 at 13:29
  • $\begingroup$ This is exactly the type of instruction I needed - many thanks! I'll edit my question to include a reference image. I do want to keep that sharp edge on the top, but I'm still interested in how you were able to split the edge like that. To be honest, a lot of what you did sort of looks like magic to me, ha, but I'll study it the best I can and try to put it into practice. Thanks again! $\endgroup$
    – Oopyddiuqs
    Commented Apr 26, 2022 at 13:31
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    $\begingroup$ well, it's pretty simple, I am a prisoner of the Blender foundation and they force me to answer :/ but they told me that maybe they will set me free at 100k reputation :) $\endgroup$
    – moonboots
    Commented Apr 26, 2022 at 14:05
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    $\begingroup$ see my edit, I hope it helps $\endgroup$
    – moonboots
    Commented Apr 26, 2022 at 16:59
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I've seen a lot of questions about keeping edges sharp, so I wanted to add this quick and easy trick.

One way to keep an edge sharp on a subdivided surface is to mark it as a crease.

Press 2 for edge select, select the edges you want, then press shift+E, type 1 then enter. The edge will turn purple and will no longer be effected by the subdivision.

This can have odd effects depending on the state of the surrounding geometry, but it is a much simpler alternative to bevel.

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    $\begingroup$ Thanks for the additional response. Definitely something I'll investigate! $\endgroup$
    – Oopyddiuqs
    Commented Apr 30, 2022 at 18:01

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