Cutout of plane with rounded corners

Question

I'm trying to cut a door out of plane, but I need the edges to be rounded. So sort of an inverted bevel. I'm a complete noob can't find the right way to do this. In the pic, the circle would be roughly the radius I need, but the interior of that rectangle would be removed.

Reference image: RV doorway

Related/duplicate maybe: https://blender.stackexchange.com/questions/78322/how-to-create-this-curved-90-degree-angle-quickly/78326#78326 — cgslav, Jan 09 '18 at 05:37
some helpful ideas, but nothing immediately applied, at least not that I could figure out. That was beveling both inside and outside, I just need the inside cutout. — uuunk, Jan 09 '18 at 06:05
A lot easier way is to extrude faces which corners you want to bevel out of the surface and bevel corner edges of the extrusion. Then delete extrusion and you'll be left with only whole with beveled corners. Topology might be needed to be corrected, so no Ngons, no tris (preferably) if you plan to use Subsurf or stuff — Mr Zak, Jan 10 '18 at 19:25
@MrZak I think your suggestion was the fastest/simplest. I used that as the basis for my answer below. — uuunk, Jan 12 '18 at 16:17

score 2 · Answer 1 · answered Jan 09 '18 at 11:01

If i understood the question you need to curve the edges

Select the side verts and Press Ctrl+Shift+B to bevel

Select the edge and subdivide both edges

Select the face and press Shift+S and select cursor to selected

Select the single vert and press Shift+S selection to cursor

Repeat to other side also.

Select both the verts and Press Ctrl+Shift+B to bevel and with the scroll wheel increase the verts

Select the face and delete or extrude it.

score 2 · Accepted Answer · answered Jan 12 '18 at 04:42

I think I found the easiest way based on answers posted and Mr Zak's comment on the extrude. If you inset (press I), then extrude (press E), you can take the outer edges and bevel (ctrl-B), then delete all the extruded parts (use cursor select by pressing C to pick the faces quickly, then press x and select Faces). Takes about 20 seconds.

itafan · Answer 3 · 2018-01-09T08:08:30.770

I don't think that this can be done automatically.

Anyway you need 5 minutes:

Starting from one plane, select the two upper vertices, press CTRL+Shift+B, drag the mouse and use Scroll for more vertices. Now you just have to merge this plane in the rest of the model, select the vertices and press F to create the faces, it's important to get a pattern like the one on the image. Then delete the central face.

Cutout of plane with rounded corners

3 Answers3