[HN Gopher] Putting Rigid Bodies to Rest
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       Putting Rigid Bodies to Rest
        
       https://xcancel.com/keenanisalive/status/1925225500659658999
        
       Author : pvg
       Score  : 91 points
       Date   : 2025-05-29 15:43 UTC (7 hours ago)
        
 (HTM) web link (twitter.com)
 (TXT) w3m dump (twitter.com)
        
       | pvg wrote:
       | Paper https://hbaktash.github.io/files/rolling_dragons_paper.pdf
       | and more related stuff on the page of one of the authors
       | https://hbaktash.github.io/
        
       | spencerflem wrote:
       | I love this !!
       | 
       | Only kinda related but I love having the opportunity to share
       | this website, cataloging every possible fair die:
       | http://www.aleakybos.ch/Shapes.htm
       | 
       | (ie: not the sort of die in the post, they must have identical
       | faces. this thread gave me a new appreciation for the non equal
       | faced dice tho)
        
       | iwontberude wrote:
       | I don't think it gets much better than this. How exceedingly
       | clever.
        
       | 90s_dev wrote:
       | Does this mean 2d physics simulators are about to get N times
       | faster? Because that'd be cool if N is big enough.
        
         | almostgotcaught wrote:
         | > our key observation is that we can identify dynamically
         | stable configurations of a rigid body, and calculate their
         | associated probabilities
         | 
         | > this model is purely geometric, and does not directly account
         | for momentum
         | 
         | answer: no
        
       | Cieric wrote:
       | I don't have enough time to read the paper in full right now. But
       | I'm curious if using this they could possibly find the solution
       | to the 3 sided coin problem. I haven't heard anything about it
       | since I watched the matt parker video about it.
       | 
       | https://youtu.be/-qqPKKOU-yY
       | 
       | Or I guess if anyone else knows the answer, that would also
       | satisfy my curiosity.
        
         | Scaevolus wrote:
         | They should be able to simulate it! Here's another answer:
         | https://news.ycombinator.com/item?id=33776796
        
           | hnuser123456 wrote:
           | Looks like that post author forgot to loop back to the
           | original question once they found a model that fit their own
           | simulations.
           | 
           | Just visually going off the chart, the answer is a "coin" has
           | a 1/3 chance of landing on its edge when its height is 1.7x
           | its radius, or 0.85x its diameter. (the blog author used
           | half-height and the paper he found uses full height)
        
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       (page generated 2025-05-29 23:00 UTC)