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I am trying to model a wall. There will be some curves in the model, so I will need to apply Sub Surf modifier while keeping the corner edges sharp. Please find my model here: https://www.mediafire.com/file/tz4cmab53uleb16/1.blend/file

This is what my work looks like before the sub surf modifier:

enter image description here

This what it looks like even when I have marked the sharp edges:

enter image description here

I had expected it to keep the right angles and prevent them from bending. Was I wrong? I have also enabled Auto Smooth.

Please note that I have already seen this thread:

Mark sharp does nothing

Thank you!!!

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    $\begingroup$ Mark sharp is only used for Shade smooth and auto smooth, Subsurface modifier does not work like you think with mark sharp, what you need there is Edge Crease (Shift + E) $\endgroup$
    – Emir
    Jun 23 at 17:02

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From what I understand, Mark Sharp will affect the shading only in order to make the edge shading look sharp, but it won't change the shape of the edge itself, so it will stay round if you've assigned a Subdivision Surface to your object, see the difference:

enter image description here

What you're looking for may be the Edge Crease option (CtrlE or in the N panel > Item > Edge Data > Crease):

enter image description here

There's also the Bevel modifier and you can play with the Edge Bevel Weight of your edge (CtrlE or in the N panel > Item > Edge Data > Bevel Weight, and in the modifier choose Limit Method > Weight) to determine if it will be affected by the modifier:

enter image description here

Or simply bevel for real:

enter image description here

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  • $\begingroup$ Thank you for the detailed explanation! and thank you too, @Emir! $\endgroup$
    – Meriil
    Jun 23 at 18:32

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