# Help about epanding simulation

**URL:** <https://blenderartists.org/t/help-about-epanding-simulation/1640280>\
**Category:** Particles and Physics Simulations\
**Tags:** simulation, animation\
**Created:** [May 8, 2026, 9:35pm UTC](https://blenderartists.org/t/help-about-epanding-simulation/1640280 "2026-05-08T21:35:06Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Hoyun\_Koyun](https://blenderartists.org/user_avatar/blenderartists.org/hoyun_koyun/32/1142918_2.png) [@Hoyun\_Koyun](https://blenderartists.org/u/Hoyun_Koyun)\
**Post date:** [May 8, 2026, 9:35pm UTC](https://blenderartists.org/t/help-about-epanding-simulation/1640280/1 "2026-05-08T21:35:06Z")

</div>

Hi, in this simulation I want to achive inflated structure in the image.

 ![image](https://blenderartists.org/uploads/default/original/4X/5/2/c/52cfb73b46a63b8cc52d1014758e8a0c832b1890.jpeg)

But I can’t make edge highlighted yellow similar with my simulation.  
 ![image](https://blenderartists.org/uploads/default/original/4X/e/2/9/e297bbb11ee0ccce2b59525cf16d9c65a15dfe4d.jpeg)

How can I achieve it? Is there any way to assign stiffness to individual selected edges? I want to make it more resistant to change edge length.

[sheetmetal\_expand.blend](https://blenderartists.org/uploads/short-url/p4M8EeSP4mM5oQCq5HMpUklmtMd.blend) (3.0 MB)

---

<div class="post-metadata">

**Author:** ![sven2](https://blenderartists.org/user_avatar/blenderartists.org/sven2/32/1410867_2.png) [@sven2](https://blenderartists.org/u/sven2)\
**Post date:** [May 9, 2026, 6:48am UTC](https://blenderartists.org/t/help-about-epanding-simulation/1640280/2 "2026-05-09T06:48:41Z")

</div>

There is a Shape section in the Cloth settings where you can use vertex groups to make parts of the mesh stiffer.  
So, not really edges but vertices, as far as I know. But I’m not very experienced with cloth simulation.  
I didn’t use stiffness. Instead I modeled the shape a bit different.

And if you convert the cloth simulation to a shape key you can then adjust the shape or combine it with other shape keys to get what you want.

 ![cloth-inflate](https://blenderartists.org/uploads/default/original/4X/4/2/b/42b6a81da012439f0d4db6570b4c9ced33827b5e.png)

[sheetmetal\_expand\_mod.blend](https://blenderartists.org/uploads/short-url/4aVbS7oqUh4heglYXuWVRD1ZqzJ.blend) (892.2 KB)

---

<div class="post-metadata">

**Author:** ![Hoyun\_Koyun](https://blenderartists.org/user_avatar/blenderartists.org/hoyun_koyun/32/1142918_2.png) [@Hoyun\_Koyun](https://blenderartists.org/u/Hoyun_Koyun)\
**Post date:** [May 11, 2026, 7:23pm UTC](https://blenderartists.org/t/help-about-epanding-simulation/1640280/3 "2026-05-11T19:23:16Z")

</div>

thank you, I believe this will work.