Newton's Balls Physics Problem

[John_Shaft]

Nothing?

[onlooker]

I thought I posted in here yesterday. I had a few ideas.

One thing I was wondering was: Are you writing this tutorial, or are you going through a tutorial that is short of complete documentation? :shrug:

[John_Shaft]

This is not my tutorial, I found it on this site in the sticky thread.
Newtons Balls Tutorial (http://www.aliaswavefront.com/en/Tmpl/Maya/html/index.jhtml?page=/en/Community/Learn/how_tos/dynamics/dynamics_m.html)
I followed that to the letter and still no success and I am wondering if it might be because I am using the learning addition.

[FloydBishop]

Are you sure you have your friction settings and gravity field settings correct? I looked at the tutorial quickly, and it looks like there are a lot of steps that involve scaling and constraints. Are you certain you've gotten these steps correct?

[John_Shaft]

I am pretty sure I have done everything correctly. Try to go through the tutorial, its really not that complicated if you know what you are doing (which I obviously do not), and see if you get this same problem.

[onlooker]

I did it, and it worked, but I did find something strange in the directions.
______________________________

___STEP SEVEN

Select the ball group node.

Select the Rotate tool and press Insert to relocate the pivot point. While pressing x move the pivot point up to the level of the crossbar. Press Insert to return to the rotate tool.

Rotate along the Z axis to bring the sphere up and away from the others.
______________________________

It never says to change all the pivots on all the balls; which I did because it wouldn't be natural, or realistic with out it. Maya gravity. Just like the real thing.

If you didn't relocate the pivot point on all 5 balls, and strands I would say that is your problem. Go through them one at a time like everything else, and it should work.

But obviously dont rotate all the balls.

:thumbsup:

[John_Shaft]

That doesn't seem to affect the physics of the balls. What I am saying is when the first ball comes down, instead of the 5th ball flying out, all of the remaining for balls move out at 1/4 the distance. Do you see what I am saying? and I really appreciate your help.

[onlooker]

Originally posted by John_Shaft
That doesn't seem to affect the physics of the balls. What I am saying is when the first ball comes down, instead of the 5th ball flying out, all of the remaining for balls move out at 1/4 the distance. Do you see what I am saying? and I really appreciate your help.

It sounds like you constrained the balls together. When the 4 balls come back do they move the one ball and flip it over the top?:eek: j/k :cool:

At the end when you set your values. It says make sure all your balls are still selected. Mine were not after I added gravity, but from the hyper-graph window go to /options - display - shape nodes, and turn on shape-nodes. select All your spheres like in the directions, and all your ridged body shape nodes. (not your nail constraints)

Because when you set the perimeters in the channel box the ridged bodies are where those perimeters are located. So I'm thinking that maybe your perimeters were only changed for one, and not all of them, and that might explain why your movement is funny. 4 of those balls might still have the default setting, and not this.__
Mass = 10
Bounciness = 1.0
Static Friction = 0.1
Dynamic Friction = 1

The default bounciness was like 0.1 dynamic friction was also very low like 0.1

I would try that. I'm not going to do it (the tutorial) again. so tell me what happened. :thumbsup:

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