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So what to do. I have a problem with topology. I'm still getting used to a 3D way of thinking. I was fixing topology on the other side of the knife, dissolving edges to keep the shape smooth (deleting part of the loop cut). The problem occurs when I have a transition from smooth to not so smooth :D.

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If it's possible draw the lines on how to retopology my knife.

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    $\begingroup$ Hello, please show the real object and maybe share your file, it's hard to understand what you want and what's the problem $\endgroup$ – moonboots Jun 8 '20 at 9:41
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    $\begingroup$ .. unless you have a reason ( e.g. printing, other export, or the nature of the original ) it will be both more realistic and easier to model the separate parts of the knife as separate parts in the model. $\endgroup$ – Robin Betts Jun 8 '20 at 10:53
  • $\begingroup$ I don't know whats going on with the rest of the model but can you dissolve the edge loop that ends at number 4? $\endgroup$ – Simon Jun 8 '20 at 19:52
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The Subdivision Surface modifier (which it looks like you are using) smoothes the object based on the average of the points. So in order to make a crease look sharper, add more geometry there. You can do this with a loop cut by using CtrlR. There are also many other ways.

But then again, as mentioned by @RobinBetts, it is much easier to make the handle and blade separately, apply the modifiers, and then join them together.

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  • $\begingroup$ I forgot to mention this. Another way that you can do this is to mark edges as creased. Select the edges that need to be sharper (less rounded) and press shift-e. Then you can change the crease value. A higher crease value will be less affected by the modifier. $\endgroup$ – Eric Xue Jun 20 '20 at 23:40

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