MSPhysics 1.0.3 (16 October 2017)

robint · 13 Dec 2016, 11:51

Hi, Robin,

The block doesn't sit still probably because you disabled the friction. Enabling the friction checkbox option for the block and for the floor contacting the block will fix the wandering off behavior.

I will add an option to control accel and damp with the SI units in the upcoming release. At the moment, I figured that spring constant is roughly equals to (accel * 7 - damp), when spring joint stiffness is set to 1.0.

Edit: Ensure that both anuglar and linear damping for all bodies are set to zero. This improves the closeness.

Anton

Yes indeed, improved action, I missed the friction box

Herewith a revised model changing block mass from 0 - 0.5 kg gives a displacement of 0 - 1.0 so the spring rate is 2

spring stiff 1 (what does this do?)
Accel 1, damp 1.5 (gives critical damping approx)

changing sample rate from 1/60 to 1/240 changes the whole model performance

iterations 16 - improves stability

the plane has a mass of 0.01kg, lowest i could get without instability

So Ive actually got a spring damper that sort of behaves but it seems like the spring has inertial mass - an ideal spring should be zero mass and friction

What do you think? Anything I can do to help (ruby dummy just now)

Cheers

Robin)

V 2

Anton_S · 13 Dec 2016, 12:21

Hi, Robin,

I just revised the spring joint to base on Hooke's law. Just need to adress a few other things before its ready for the release.

Regards,
Anton

robint · 13 Dec 2016, 14:00

@anton_s said:

Hi, Robin,

I just revised the spring joint to base on Hooke's law. Just need to adress a few other things before its ready for the release.

Regards,
Anton

Hi Anton

It occured to me loking at the motor joint, that it would be neat to have control sliders on important coeffs, of spring rate, friction, and damping, help to speed up student experience

BTW just seen some example in Sketchucation, blown away with the talent out there

Hope my little exercises aren' t too dull

Cheers

Robin

gilles · 15 Dec 2016, 09:11

What am I doing wrong?

THEO-JANSEN2.skp

Anton_S · 15 Dec 2016, 09:49

Hi, gilles,

You just need to adjust motor joint properties. So, select the motor joint, open MSPhysics UI, and set Accel to 20, Damp to 10, and uncheck the Free Rotate checkbox option. This should make the motor more stronger.

Anton

gilles · 16 Dec 2016, 12:58

Thanks Anton,

Very nice tool you made there.

THEO.skp

Anton_S · 16 Dec 2016, 13:33

Very clever, gilles!

I'm sure there is a way to improve performance and stiffness of that thing.

Anton

gilles · 16 Dec 2016, 14:02

Théo Jansen.

http://www.strandbeest.com/index.php

pilou · 16 Dec 2016, 14:24

The peaceful robots!

gilles · 17 Dec 2016, 12:07

I had issues with MS UI: modifying values, sometimes works sometimes not.

Then I notice this: typing a value +enter or tab does not work.
Typing a value + click outside the input box works…

Just for anybody else having the same troubles.

Mac OSX 10.8.5, SU2015.

Anton_S · 17 Dec 2016, 13:24

Yeah, I'm working on that. Thanks for the report, gilles!

robint · 18 Dec 2016, 20:23

@gilles said:

I had issues with MS UI: modifying values, sometimes works sometimes not.

Then I notice this: typing a value +enter or tab does not work.
Typing a value + click outside the input box works…

Just for anybody else having the same troubles.

[attachment=0:3sqfwcxi]MS-UI.gif[/attachment:3sqfwcxi]

Mac OSX 10.8.5, SU2015.

Hi gilles

I don't know if this is related but i noticed that when trying to alter friction, on cursor in window an X appears on the rhs and a new input will only be accepted after mouse over click X which blanks the window for a new entry

kinda convoluted

Robin

Anton_S · 22 Dec 2016, 19:42

Announcing 0.9.9!

This version comes with mainly an improved dialog and joints.

View changelog for details: http://www.rubydoc.info/github/AntonSynytsia/MSPhysics/file/CHANGELOG.md

Anton

SketchyPhysicsNutt · 23 Dec 2016, 02:18

Thanks Anton for fixing the full-screen issue my animations are back to normal
MSPhysics 0.9.9
tested on win 8.1 and sketchup 2015/2016 working fine.

the new plane joint works great on single or two different planes

thx again and merry xmas

Tez

Anton_S · 23 Dec 2016, 08:35

Hello, Tez,

Good to hear that it's working now. And merry Christmas to you too!

Best regards,
Anton

SketchyPhysicsNutt · 23 Dec 2016, 12:50

Sorry Anton forgot to ask u in my last post about simple OnTouch sound scripts

in Sketchyphysics i just tick the OnTouch panel and use
playSound('Sound1')

what's the MSphysics equivalent script for Ontouch sound .....i keep getting an error?
its no bug ..just me don't understand MS scripts yet.

Tez

robint · 23 Dec 2016, 14:40

Hi Anton, installed 0.9.9 and restarted SU
but its screwed up my model?
It falls downwards and I cant get the static floor to work as before, also the script stopped working
Did I do a corrupt installation?

Should I have deleted 0.9.8 first - you didnt say?
I assumed it would overwrite and update itself
Where to go? delete and start fresh installation or go back to 0.9.8?

What to do?

Robin

falling block7.skp

Anton_S · 23 Dec 2016, 15:16

Tez,

In the Sound tab of the MSPhysics UI, whenever a sound is added, a piece of code for playing the sounds is displayed below. For your case, after you add the sound to the MSPhysics UI, the code for playing it would be:

onTouch { |toucher, position, normal, force, speed|
  simulation.play_sound("Sound1")
}

You can also refer to this scripting documentation link for playing 3D sounds: http://www.rubydoc.info/github/AntonSynytsia/MSPhysics/master/file/Overview.md#Music___Sound

Anton

Anton_S · 23 Dec 2016, 15:25

Robin,

I assume the script you talk about is the controllable sphere thingy. There has been some scripting changes and the documentation for the controllable sphere is updated. For your case, you will have to replace the add_force2 function with the add_force function.

Now, I don't know how the static floor behaved previously. Basing on the model you posted, everything is working fine. I don't see any issues.

If you want to revert to on original version, you may always refer to the instructions on the homepage.

Anton

robint · 23 Dec 2016, 16:21

Very strange Anton, I removed the sphere from the model to avaoid confusion , but on mine Falling block 7 the whole model falls. I must assume I got a corrupt installation, so will start again afresh back to 0.9.8 and fb 6

Cheers

Robin