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My goal is to make a curved Pillow Box model in blender starting from the flat die-line. The problem is that there seem to be no real accurate way to control the amount curve of the folding panel without using bevel modifier or something like that.

enter image description here enter image description here

40pro
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  • Do you merely want to model it or do you want to animate the folding process? – Haunt_House Feb 16 '18 at 04:11
  • well,if it can be animated is better. But yes I want to fold it in the most "natural" way possible without starting from a cube and apply modifiers. – 40pro Feb 16 '18 at 04:12

1 Answers1

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You can use a few objects for this...

Here is the objects involved enter image description here

Pick one of the circle meshes as the target mesh.

Use the other three remaining circular meshes as the "theoretical children".

Apply the Copy Scale Constraint to all three of these children. enter image description here

Use these settings for the constraint on all three children.

enter image description here

Arrange the mesh objects as shown.

enter image description here

Here's a demo of the magic. enter image description here

Appended The Working Blend File Using Drivers + Demo Animation of how to use it

enter image description here

Rick Riggs
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    Only problem: the curve is a part of a circle, not half an ellipse – Haunt_House Feb 17 '18 at 14:22
  • @Haunt_House great catch, I have adjusted the solution on this using drivers and I will post the blend immediately for study, and appended demo. soon after I will post the write-up – Rick Riggs Feb 19 '18 at 12:22
  • Looks promising. Let me take a while to digest the solution. – 40pro Feb 19 '18 at 17:10