How to make a fold while following a circle edge? Hi. New to Blender, so appreciate any help possible. I'm working on a yoghurt pot render (not the one shown), and the seal cover under the clear lid is a typical thin foil cover with a tab so as to pull it open. The image on the left is an example of what I mean. The dieline I'm working with is shown in the centre. As you can see the tab folds down from a section of the circular foil cover. 

What is the best way to do this? I've already drawn my circle and extended the vertex on the X axis to create the square edge as a flat shape, but now want to fold this part down. Is it possible in Blender to rotate the tab section so that it folds along the edge of the circle, shown as a dotted line? I understand about moving the pivot point, but that's not working for me as it's only pivoting off one vertex point and not an edge, and is doing weird stuff to my shape. 

An alternative would be to extend the vertex down 90 degrees on the Y axis, then adjust the heights of each vertex to get the basic shape and add a subdivision surface modifier and tweak with edge loops, but I was wondering if its possible to rotate/fold around the circle edge. Cheers.
If I understood the question. I have found 2 answers for it.

Answer 1


Add a circle and go in edit mode and press F to fill
faces.
Add a plane and go in edit mode and press W and subdivide once.
Delete 5 vertices and just have a square shape below.
Select the square and circle and press Ctrl+J (Join).
Go to edit mode and select the corner of the plane and press Ctrl+Shift+B (Bevel) and with the mouse wheel scroll to get segments.




Cleanup Geometry

Go to edit mode and select the verts of the curve and remove doubles and then Press F to fill faces.





Answer 2


Add a plane select to edges and Mean crease in the Properties panel (N) in edit mode.
Add Subsurf modifier view 6.
Add a cloth simulation with default value.





Smooth shading
Add a base cup shape and in physics panel add collision to it.
Play and stop the animation at a point where your satisfied.