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I'm trying to cut a rectangular hole in my cube. You can download my source file on this link. The cube was tempered with subdivision modifier and the shading is smooth. This is what I got so far:

enter image description here

I used the left block and a boolean modifier to cut a hole. The problem is that I need my hole to be exactly the same shape as block-right angles are necessity. The Blender gives a warning that my boolean modifier is not the first one and that results may not be what I expect. So how do I cut a block hole out of the object with smooth surface? This really bugs me and I'm very thankful for your help.

EDIT: situation after smoothing inner part of cube with subdivision modifier and Smooth option from Shading panel:enter image description here

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First things first. Boolean is not a good choice in my opinion to receive simple shapes like that.

If I understand you right, you only want a cube which has rounden edges with a rectangular whole in the middle.

This is how I would do it. First create a simple Cube.

enter image description here

Than subdivide it twice

enter image description here

Delete the inner faces

enter image description here

Now select "Bridge Edge Loop" under the "CTRL +E" Sub Menu

enter image description here

Last but not least, round your edges

enter image description here

Now you can still add a subdivision Modifier to make it even more smooth.

enter image description here

To keep the whole sharp, select all edges and increase the Mean Crease to 1.

enter image description here

Now select the faces you want to be sharp and click Faces -> Sharp under the "Shading"-Tab

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  • $\begingroup$ Thank you so much! Is it possible to add subdivision modifier only to outer edges? I want the inner part to be a rectangle $\endgroup$
    – potato
    Jul 8, 2015 at 10:46
  • $\begingroup$ @krompir2 yes you can, hang on I will update my answer $\endgroup$
    – Marten Zander
    Jul 8, 2015 at 11:28
  • $\begingroup$ beautiful! I wanted to add additional smoothness so I clicked Smooth from Shading panel. Unfortunately, the whole cube gets smooth. Is it possible to apply Smooth only to outer edges? $\endgroup$
    – potato
    Jul 8, 2015 at 12:50
  • $\begingroup$ @krompir2 yes it is, I will update again :D $\endgroup$
    – Marten Zander
    Jul 8, 2015 at 13:00
  • $\begingroup$ Man, I love you :D $\endgroup$
    – potato
    Jul 8, 2015 at 13:09

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