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I've used blender for a couple months, my knowledge is limited to basic modelling. I'm trying to get the effect of string being tied around a soft object. Like this string around my finger. Not sure what to call this effect so I've had a hard time trying to find some sort of tutorial. enter image description here

At the moment I am trying to use soft body and collisions with a force field to get the string mesh to tighten around my subject. The two torus are my 'string' which have soft body and collision on them. The bird has a soft body. And the force field has a negative strength of 20 to shrink the torus around the bird. enter image description here

When I play forward it seems like the bird doesn't correctly detect the torus and the torus just goes through the bird. enter image description here

I don't need the string to animate, I was just hoping once the string tightened I could bake the mesh with the desired effect.

If you know a simpler way to get the effect I need without simulations that would be great too.

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2 Answers 2

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I just tried out this, and it worked "ok":

I just created a cylinder with soft body and some subdivisions.

I created a torus as rigid body -> animated.

Then i just animated the scale of the torus.

Result:

enter image description here

enter image description here

video: https://youtu.be/D0N_39XnB04

and here i tried pretty much the same as above (don't forget the collision modifier for the rigid body) but more in the direction as your finger was:

enter image description here

I think soft body simulation is doing a pretty good job here. And i didn't even tweak a value. All soft body default settings.

But of course - soft body simulation take really time to calculate/render.

blend file of my last test:

video result: (remember: default settings, so the softbody shakes a bit ;)) https://youtu.be/7zldLlAdN-w

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    $\begingroup$ nice, just cut the gravity to avoid the bouncing $\endgroup$
    – moonboots
    Jun 22, 2021 at 9:05
  • $\begingroup$ thank you!!! ;) $\endgroup$
    – Chris
    Jun 22, 2021 at 9:09
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    $\begingroup$ This looks like a great solution, I opened your file but nothing happened. The red spiral just went straight through the cylinder. Do I need to enable something? Soft body has worked for me before, I got a ball to move in some sort of soft body like manner. Or perhaps my laptop can't handle it :( $\endgroup$
    – Samantha A
    Jun 23, 2021 at 3:51
  • $\begingroup$ @SamanthaA: Yes, you have to calculate the physics. So select the cylinder, press on "physics settings" and then hit "bake". After that you can start the animation. [1]: i.sstatic.net/bchk9.png. Be aware: This can take some time - depends on the hardware capabilities of your computer. $\endgroup$
    – Chris
    Jun 23, 2021 at 4:50
  • $\begingroup$ Ok that worked on your file. So I'm trying to test this solution in a new file with a ball as a soft body then a torus as the collision. It's almost the result I need and I'm reading through the Blender documentation for the different settings and I can't quite get the result I need. As the torus approaches the ball, some vertices of the ball poke outwards like it wants to stick to the torus. Once the torus is a little tight around the ball, some of the ball is still poking through the torus, almost as if the vertices don't want to shrink the distance between each other. $\endgroup$
    – Samantha A
    Jun 25, 2021 at 0:17
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One simple way is to use sculpting, with the crease brush, but you have to create enough geometry, adding and applying a SubSurf modifier, or multires, or dynamic topology while sculpting (i.e. this cylinder has 10.000 vertices).

enter image description here

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