MASH dynamics solver

[Steve Davy]

I've noticed that adding a new dynamic element to a MASH network will result in a different dynamic result in certain aspect of the simulation, regardless of whether the new dynamic element has a direct affect on those aspects of the simulation.

E.g. some balls rolling down a chute and bouncing off the floor will behave differently on the way down the chute with the floor turned on in the solver, versus it being turned off. That is, not only do they bounce with the floor on (of course), but will roll and bounce differently before they reach it.

I wouldn't exactly call this desirable behavior, but I'm wondering if this is just intrinsic to how a dynamic solver works? That is, every dynamic element affects the calculations, regardless of whether any individual element has a direct affect on another?

[Ian Waters]

Hey Steve,

I’d need to look at a scene to see exactly what’s going on; it could be an over zealous optimisation in Bullet to do with scene size but can’t say for certain without looking.

Best,

Ian

__ Ian Waters Lead Developer Mainframe 82 Silk Street Manchester M4 6BJ 0161 205 4763 mainframe.co.uk @ianwaters

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[Steve Davy]

Hi Ian,

I've attached the test scene I was working with. Turning the ground plane on an off seemed to affect the way the balls grouped, rolled and behaved. At one point it caused them to get stuck in the funnel at the top (this was a problem in general with the sim, but I remember turning the ground on had this effect).

Here's also the playblast resulting from the scene:

https://vimeo.com/239038242

I've also noticed that smoothing on the spheres seems to affect the sim as well, even though I have collision type set to sphere. Intuitively I would expect this to stay consistent, but perhaps that's related to the Auto Fit attribute? I don't think I tried turning that off, but obviously when setting up a dynamic sim it's often desirable to develop it with a low rez proxy.

Overall though the new dynamics are SUPER AMAZING! I can't believe how powerful and robust they are, and easy to use for relatively non-technical people like me. Rigid bodies are dead!

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From: maya...@googlegroups.com <maya...@googlegroups.com> on behalf of Ian Waters <water...@gmail.com>
Sent: Friday, October 20, 2017 3:25 AM
To: maya...@googlegroups.com
Subject: Re: [maya_he3d] MASH dynamics solver