Les Stuck

In our second in-depth Jitter Physics tutorial video you will learn how to access the collisions of a physics world to use elsewhere, use forces to move bodies around, connect bodies and control motion with various constraints, and optimize the simulation timing of the physics world.

Download the patches used in this tutorial.

Learn more basic concepts to build your physics world. Second part of a two-part series. (Part 1: http://youtu.be/B4ZI6xfDtro)
- Get the patches used in this tutorial: http://1cyjknyddcx62agyb002-web-assets.s3.amazonaws.com/physics/jit.phys.intro.video.patches.zip 

Visit http://cycling74.com/physics/ for more information.

Introduction to jit.phys, Part 2

Harness rigid bodies with the second tutorial video covering collisions and constraints.

introduction-to-jit-phys-part-2

It was pointed out that there is something confusing happening at 1:50.

Because of the multiply object attached to the mass number box, changing the mass of the body changes the force of the ghost, so that the force acts like gravity. However, you never get to see this behavior because clicking the large message box resets the force back to its original value, so that the more massive body moves more slowly in reaction to the same force, which is correct. I probably should have deleted the multiply object before shooting the tutorial.


Hi Les, this is great thank you. I am having some problems trying to move objects using the leap motion. I would love to interact with a phys.body but somehow the hands do not interact with the body. (please see screen shot).
Please let me know if you know a solution to this, what I am doing wrong. thank you.


it seems your hand is not part of jit.phys world


Hi @Vichug, yes they are..
Could it be: The hands are drawn with jit.gl.sketch which render a gl. visualisation of the incoming data from the leap.They are not a phys.body them selves, therefore they cannot collide with anything??


it's impossible for us to tell from a partial screenshot, so post your patch if you want help.
from the screenshot it looks like you don't have a jit.phys.world object in your patch.


@Rob, sorry about that. please find attached the patch.
The folder includes the leapmotion object  too ( http://julesfrancoise.com/leapmotion/ ).

Please let me know if you  could help. Thank you


as vichug says, your hand is not part of the phys.world.

you need to create phys.bodies for each part of your hand that you want to interact with the phys.world. they should be @kinematic 1, and easiest is probably to simply create phys.body sphere's for each blue sphere of your hand, and update their position with the position you give to each blue sphere.


Hello Rob, thank you for the reply. Yes I did work that out today.. I tried with one sphere and worked..
A
I did some research on the kinematic attribute too. thanx so much.


Hi SPA, yes def I will. I doing a BA project duwe in December, once is done I share it here. Thank you guys. btw Rob tip worked great ..thank you all


Quick update re leap + Oculus:
 The patch is working..i am testing as we speak. wanted to report few problems:

To fully render both hands, I ended up creating ’42’ individaual jit.phys objects (pleas tell me i am wrong).
This is creating fps drops.

I believe i should be able to create multiple phys object via the jit.phys.multiple.. but I have no idea how to send the leap positions (x y x for each ) to the the jit.phys.multiple.
I was thinking.. maybe if I use the jit.phys.multiple instead of individual ones should reduce fps drops and errors.

Please advice me on this, I have attached the patch so you can have a look.
