Convex Stacks VS Box Stacks (3.12)

Report any bugs here and we'll post fixes

Moderators: Sascha Willems, Thomas

Re: Convex Stacks VS Box Stacks (3.12)

Postby Julio Jerez » Sun Jul 06, 2014 8:46 am

Ok the restitution demo is fix now.

notice that the restitution demo does no uses the body material , instead it use the user data in the collision shape.
this makes it more easier to use newton with unilateral materials like many physic commercial physics libraries do.

The material graph is much more powerful but it but it is a legacy that use the body, many one day I will change the so that is use he collision shape instead,
but for now it is what it is.

Not the restitution and the buoyancy should be working fine.
I am working on the Vehicle now. and after that I will make a special 3DOF joint for ragdolls.
Julio Jerez
Moderator
Moderator
 
Posts: 12249
Joined: Sun Sep 14, 2003 2:18 pm
Location: Los Angeles

Re: Convex Stacks VS Box Stacks (3.12)

Postby AntonSynytsia » Sun Jul 06, 2014 2:47 pm

Very well, Juleo!

Everything seems to work good, now. Thanks :D
AntonSynytsia
 
Posts: 193
Joined: Sat Dec 28, 2013 6:36 pm

Re: Convex Stacks VS Box Stacks (3.12)

Postby JoeJ » Mon Jul 07, 2014 7:22 am

Julio Jerez wrote:and after that I will make a special 3DOF joint for ragdolls.


Yay, can't wait for that... :D
User avatar
JoeJ
 
Posts: 1453
Joined: Tue Dec 21, 2010 6:18 pm

Re: Convex Stacks VS Box Stacks (3.12)

Postby Julio Jerez » Mon Jul 07, 2014 11:27 am

It will be a small angular approximation 3dof.

if you remember I mentioning that, the product of angular matrix is commutative for small angles,
in fact this is the property that make possible the derivation of the Rodriguez identity that establish that any sequence of small angular rotation is identical to one singular small roation. http://en.wikipedia.org/wiki/Euler%E2%8 ... es_formula
The only way the is possible is if the product of small angular matrix is commutative.

Using that principle, it is possible to make a joint in which all three angle can by controlled and independent variables, and that is what I am going to do.
the is only one caveat, and that is that the joint nee to have a maximum angular speed, and the speed can no bee too high,
because is it the angular step will break the Rodriguez condition.

The payoff is that the joint implementation will be so much more robust and much simple to implement.
Now that I refactored the vehicle, I will start to write that joint.
Julio Jerez
Moderator
Moderator
 
Posts: 12249
Joined: Sun Sep 14, 2003 2:18 pm
Location: Los Angeles

Re: Convex Stacks VS Box Stacks (3.12)

Postby AntonSynytsia » Sat Jul 12, 2014 2:15 am

Julio Jerez wrote:Using that principle, it is possible to make a joint in which all three angle can by controlled and independent variables, and that is what I am going to do.

Cheers!! :twisted:
Does that mean we would be able to use one joint to steer the wheel (servo) and to rotate the wheel (motor), a combined joint?
AntonSynytsia
 
Posts: 193
Joined: Sat Dec 28, 2013 6:36 pm

Re: Convex Stacks VS Box Stacks (3.12)

Postby JoeJ » Sat Jul 12, 2014 12:40 pm

If the wheel should not spin fast, yes.
But the best use case would be robotic arms.
User avatar
JoeJ
 
Posts: 1453
Joined: Tue Dec 21, 2010 6:18 pm

Re: Convex Stacks VS Box Stacks (3.12)

Postby AntonSynytsia » Mon Jul 14, 2014 3:28 am

Very well! Physics to the next step :twisted:
AntonSynytsia
 
Posts: 193
Joined: Sat Dec 28, 2013 6:36 pm

Previous

Return to Bugs and Fixes

Who is online

Users browsing this forum: No registered users and 8 guests

cron