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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

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Delete the inner faces

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

enter image description here

Last but not least, round your edges

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

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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 '15 at 10:46
  • $\begingroup$ @krompir2 yes you can, hang on I will update my answer $\endgroup$ – Marten Zander Jul 8 '15 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 '15 at 12:50
  • $\begingroup$ @krompir2 yes it is, I will update again :D $\endgroup$ – Marten Zander Jul 8 '15 at 13:00
  • $\begingroup$ Man, I love you :D $\endgroup$ – potato Jul 8 '15 at 13:09

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