>>1024300

>>1024300
here is the simulation

https://www.youtube.com/watch?v=I1cNctgGmhE

Just like getting a real biscotti through a real dounut, friction is your enemy. Set it to 0. Animate that parameter if you need it in other parts of the simulation, but you probably wont.
Heres the real deal though. You will spend the rest of your life fine tuning the parameters of the dynamics and never get it right. You want save yourself work as opposed to animating the thing with bones and blendshapes.
I would strongly siggest a hybrib approach. Make a static doughnut you animaye by hand. Broad strokes animations. That mesh drives a dynamic mesh which is trying to copy the static mesh which is also sensitive to momentum and collisions.
Ive been researching biscotti doughnut rigs for awhile and what i keep coming back to is that the solution is blend shapes and bones.

File: 1730149229354444.gif (891.8 KB)

891.8 KB GIF

Here's one i made to test. Also a cloth sim with vomume conservation.

>>1024308
tried adding bones actually helped alot thanks anon!ill keep posting as i go along currently trying to add shapekeys

File: rimrig2.webm (249.9 KB)

249.9 KB WEBM

>>1024300
This tutorial is of course a classic, referenced to do the thing on the left: https://www.youtube.com/watch?v=bLps8bgIeJ4

the general idea is the shrinkwrap on the eight guide bones will keep the donut hole wrapped around the biscotti, but only if the biscotti is between them and the hole is smaller, apart from that it just follows whatever motion you animate

>>1024313
this is incredibly usefull thank you!

File: slywink.png (88.8 KB)

88.8 KB PNG

adding bones helped a ton do any of you know how to get shapekeys to activate the closer bone the further away bone A pushes bone B?(limit distance bone constraint)

https://youtu.be/je-aajBigrg

File: Screenshot 2026-01-11 002705 cropped.jpg (74.7 KB)

74.7 KB JPG

Thought of this thread after making this
>>>/h/8813050

>>1024439
One way is to make a bone stretching to bone B then use a driver based on (stretching bone's length -1)/expected max length, on the shape key's weight

>>1024471
whoops, meant scale factor -1

Updates?

>>1024982
my bad man i forgot
i set it up so that each bone streches the donut in a different direction when the biscotti gets to close and added a cloth modifier to give the donut "donut physics" its too jiggly and dosent maintain its shape as well as it should but i have a good feel on what to tweak to get where i want to


heres the progress and the modifiers and simply wrap pro settings i used to get the effect,still trying to figure out how to make "coffee" splash out of the hole or have bubbles come out of it thats where im at

https://youtu.be/KDK21asHuVc

File: del.png (207.9 KB)

207.9 KB PNG

>>1025061
didnt think the quality would be so bad here are the current settings

>>1025061
Needs more dampening. That'll settle it down quicker.