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I have a model that is made artificially, the model covers a square shaped area. It's something like that if you look in a cross-sectional view:enter image description here

How can I remove any noise above the bottom surface of the model, leaving the vertices at the bottom that shapes the S-shaped curve? There is a bottom surface in the object, but as the surface is not modeled separately by the computer, I have no clue how to get it.

This is what I want to get: enter image description here

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welcome to BSE, take the same object (but has to fit the same object itself, or there will be issues with the intersections) and duplicate and move a bit in the z axis and add a boolean modifier to the target object, and set the source to the duplicated mesh, and apply boolean, good luck...

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    $\begingroup$ Thanks for your great answer, I tried and it worked. $\endgroup$
    – desmond ng
    Nov 22, 2020 at 8:59
  • $\begingroup$ mark the question as solved pressing in the button... $\endgroup$ Nov 22, 2020 at 9:23

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