[HN Gopher] Augmented Vertex Block Descent (AVBD)
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       Augmented Vertex Block Descent (AVBD)
        
       Author : bobajeff
       Score  : 78 points
       Date   : 2025-06-21 04:04 UTC (18 hours ago)
        
 (HTM) web link (graphics.cs.utah.edu)
 (TXT) w3m dump (graphics.cs.utah.edu)
        
       | nurettin wrote:
       | Collision detection doesn't seem to work when a particle's
       | velocity exceeds the object size / check interval
        
         | cyber_kinetist wrote:
         | There's another paper called "Offset Geometric Contact" to be
         | presented in the same conference, which solves the penetration
         | issues with the VBD solver (and thus compatible with this
         | paper): https://www.youtube.com/watch?v=xxyniqSLJik
         | 
         | The new GPU collision detection method guarantees no
         | penetrations throughout integration for VBD-like solvers
         | (although you can also use it with Newton-based solvers with
         | less optimal results). Over the past few years the direction
         | for graphics research have mainly been looking at accelerating
         | the IPC solver (which theoretically guaranteed penetration-free
         | simulation but was too slow to use for real-time simulation),
         | but seems researchers have figured out an alternative path that
         | doesn't have the same scale-up issues on the GPU. Although I
         | think you would still need an IPC-like second-order solver for
         | very accurate simulations (ex. for mechanical engineering), for
         | games and VFX this is certainly good enough.
        
       | Gbox4 wrote:
       | This is cool, are there any game engines doing this?
        
         | yorwba wrote:
         | This is the demo page for a paper that will officially be
         | published in August.
        
         | RicoElectrico wrote:
         | If ever, expect Roblox to implement this, per one of the
         | author's affiliation.
        
       | stephc_int13 wrote:
       | Is there any source code available somewhere for the GPU demo or
       | the 2D web demo?
        
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       (page generated 2025-06-21 23:01 UTC)