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New Research in Detailed Rigid Body Simulation with Extended Position Based Dynamics

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Drutort

Senior Member
This could be a a major game changer in a number of industries, and the realism along with the realtime ability without massive computation is very impressive. Virtually changing a number of industries.

Which brings to CAD, I saw based on the link that AutoDesk was a sponsor, wondering if they are jumping in on this tech. I would assume bringing such tech to your user base will draw many way from those competitors who are left in the dust?

(Ran into this on YouTube)

The paper:
https://matthias-research.github.io/pages/publications/PBDBodies.pdf

https://computeranimation.org/

Videos

I would defiantly pay extra for addon or higher package for such abilities, also this will make other software somewhat obsolete

I think if Alibre gets this into their engine, and brings it to both atom and design, it will attract even more user base, pair it with how user friendly Alibre is and at the price point that its at.
 
Last edited:
GIOV

GIOV

Alibre Super User
Hi Paolo,
Do you have some example of a hull in the water with liquid cargo inside that gives a free surface effect to the hull Cg and also the water where the hull float have some waves that affect the bouyance Cg.
Thanks,
GIOV
 
Plista

Plista

Member
Interesting question, how to justify a kinetodynamic program to work for fluid dynamics simulations?
If the force field of fluids can be solved with known formulas of force action on the surface, as a function of internal and esternal parameters that modulate intensity, modulus and point of application, then valuable and accurate simplifications can be obtained.
A simple example to explain: how does the propulsive thrust of a swimmer's fin vary with its flexural rigidity?
A complete approach to the problem would require the complete manikin solved in 3D CAD and immersed in a 3D field of fluid dynamic forces.
But if, in any case, the swimmer's friction can be considered a constant external to the problem, and if we justify a 2D solution, how could the analysis be simplified by admitting a certain tolerable margin of error?
In the example in http://www.lista.it/atnet/caszan.htm you find a possible solution, explained in the 297 pages of a university thesis of over twenty years ago (link at the bottom of the page), solved with the Working Model 2D, the two-dimensional solution of the SimWise software which shares with it the exact same formula language.
The example shows the starting transient of a swimmer, in bathyscapheic equilibrium, from rest to full speed, given a certain (variable) flexural stiffness of the fins and calculating the torque at the joints of the lower limbs (and therefore the energy efficiency).
You can appreciate the variation of the instantaneous speed at the Crawl movement.
The 297 pages of the thesis justify all the simplifications adopted.
With a similar approach I have more recently simulated three other more complex pseudo fluid dynamic cases in the 3D environment with SimWise:
- the overflow of the surface of water in an infinity pool argumented with forensic expertise
- the effort to open the Mose barriers that protect Venice from high water
- the docking of a child submarine to a mother submarine
Unfortunately, in all three cases above for confidentiallity I would have to correct and falsify the videos before making them public, without therefore being able to justify the engineering contents which at that point would seem artifacts.
I therefore preferred to answer you with a simpler case (but not too much!) that at least can be explained and demonstrated step by step.
Please find other 2D and 3D simulations (some in English as well) explained in http://www.lista.it/atnet/index.htm
 
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