Can I remesh only the part I want? (Sculpt mode)

I want to remesh only the marked part or the part I want
I wonder if there is such a function.
No Dyntopo.

You can use the mask function to lock a painted area from sculpting.
The one in your 2nd column at the first gap.

I donโ€™t understand. Can you give me more details?

No. You canโ€™t remesh only a portion of a mesh.

If there was a remeshed part and an unchanged part that would imply to have a transition margin between those parts that would preserve edge flow to avoid an ugly result.

If such solution was known, dyntopo would produce quads instead of triangles.

Thatโ€™s why, although there are several algorithms offering to give priorities to different options : they are all remeshing the mesh as a whole. (you may test quadriflow result or other remeshing apps like Instant Meshes)

The only way to make a local remeshing is to, at some step, do a manual editing, a manual retopology.
In future, retopology tools in Blender could be improved.
There is room for improvement in that area.

But for the moment, there is no easy automatic solution.

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Thank you for answering my question.