MS Physics 0.0.9

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MS Physics 0.0.9

Postby RicardoMosci » Fri May 19, 2017 8:26 pm

In MS Physics, is it possible to maintain and object inside a rotating cylinder? If I make the cylinder a static mesh it will not rotate. If I don't make the cylinder a static mesh, the object will go through the walls. Please see attached SU 2015 animation.
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Re: MSPhysics 0.9.9 - Fixing TREFOIL

Postby Anton_S » Sat May 20, 2017 12:12 am

Hello, Richardo Mosci,

To fix this, you have to divide the concave cylinder group into sub convex groups, so that the hollow cylinder is made up of additional internal groups. This can be done with Convexify plugin, by fredo6, which automatically divides solid concave shapes into convex groups. Then the top level shape must be set to compound.

For your model, before using convexity, first divide the outer, hollow cylinder and the inner mixer into separate, internal groups. Then, set the outer cylinder's state to Ignore. You won't need it part of simulation because the green cells will serve as the collision instead. Then ensure that the mixer part is solid (has a valid volume) and doesn't have any invalid geometry. You can use TT Solid Inspector and TT Cleanup for that. Ensuring that the mixer is solid, will yield the proper generation of convex sub-groups when you use the Convexify.

The fixed versions of your model is attached below. You can also try fixing it yourself, by following the instructions above, so that you know how it's done. Also, next time, use components for the green cells to reduce file size.

Regards,
Anton
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Re: MS Physics 0.0.9

Postby RicardoMosci » Mon May 22, 2017 12:30 am

Thank you Anton. Great help.

Can I slope the hollow cylinder along its axis so that the ball slides down as it moves sideways?
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Re: MS Physics 0.0.9

Postby pilou » Mon May 22, 2017 12:34 am

@Ricardo with your own model
Seems you have not put the motor as it must to be ! :)

I just kill Motor
Explode all one time
Group all except ball
Put the motor
& voilà

Try this one!

GIF_cylinderok.gif
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Re: MS Physics 0.0.9

Postby pilou » Mon May 22, 2017 12:44 am

Kill the motor
Slope the Cylinder
Put the motor perpendicular to the cylinder

But of course the ball will be down outside in few moment! :)

GIF_incline_cylinder.gif
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Re: MS Physics 0.0.9

Postby RicardoMosci » Tue May 23, 2017 1:31 am

Thank you Anton and Pilou.

Can you tell me, step by step how to make the cylinder and the mixer "solid". The box is still going through the walls.

I eliminated the green mesh to make the cylinder simpler.

Ricardo
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Re: MS Physics 0.0.9

Postby Anton_S » Tue May 23, 2017 7:18 am

Well, since you removed the cells, that initially served as a collision, you will have to apply Convexify to the outer, hollow cylinder. When you do so, ensure that convexified parts are inside the group where the convexified mixer is and that they are not ignored. You can check out the videos at Convexify's homepage for instructions on how to use it.
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Re: MS Physics 0.0.9

Postby pilou » Tue May 23, 2017 9:05 am

@Ricardo
Curious your file "Mixer" crashes my SU !
Can you save the SKP file as "Version v6" ?

v6.jpg
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Re: MS Physics 0.0.9

Postby RicardoMosci » Tue May 23, 2017 2:13 pm

Pilou, I have multiple versions of SU in different computers. Let me see if I can save the model in V6. I will send you a few to test.

Anton, I will try to learn Convexify. I am still trying to find a good link to it.

Thank you both for your continued help. This cylinder has to work!

Ricardo
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Re: MS Physics 0.0.9

Postby pilou » Tue May 23, 2017 3:01 pm

Let me see if I can save the model in V6

You can save as V6 in any version ! ;)

(of course not from the V5 ! :ugeek:

from 2017.jpg
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