Maya 2009 Nparticles Have No Conserve?

[zhenpanda]

In maya 2009 the nParticles have no conserve...
when on nParticle that's moving hits another nParticles that's sitting there, and both are the same mass
the moving nParticle has conserve of 1 or 100% when it hits the 2nd particle the 2nd one just moves a little....
...shouldn't the 2nd particle be moving forever as long it the animation is running??

it works in normal dynamics...but doesn't for nParticles in nDynamics....

[ruchit]

b4 asking this question to another ppl plz firt think in ur mind like update by autodesk is good or bad.for my side it it is good bcz when one obj collide with another obj,then not cmplt energy is transfer from one to another and energy never remain constant there is always some reduction in energy.so during collision first obj already loose some energy & after collision magnitude of energy go down more due to friction etc.....................so think real physics.

              i think this help u otherwise keep asking on this forum

[zhenpanda]

QUOTE(ruchit @ 01/19/09, 05:47 AM) [snapback]299171[/snapback]
first obj already loose some energy & after collision magnitude of energy go down more due to friction etc.....................so think real physics.

              i think this help u otherwise keep asking on this forum

well, the thing is that maya is a void so the laws of real physics doesn't really apply only it's concepts is working.
so two objs with 100% conserve, which can never really exist in real life...collide, it's energy will be transfered 100%

i'm just saying it might be a bug because why maya isn't consistent with it's math behind
it's normal dynamic...vs...nDynamics

[joojaa]

QUOTE(zhenpanda17 @ 01/19/09, 02:24 PM) [snapback]299179[/snapback]
so two objs with 100% conserve, which can never really exist in real life..

Conserve has nothing to do with how much energy the particles inpart to each other whan hit. In reality conserve is allways 100%, its just that sources it gets spread to are more numerous than in simulation. Conserve is about how much of the previous frames energy is kept in next frame wich is different. Its just a easy trick for some dybmics but ive never needed anything other than 100% on any of the particle styles, it not exist in reality at all.

Now since conserve has nothing to do with this then what does? Well, under collissions you have a attribute called bounce, that and friction together define how much the second raticle will get energy.

QUOTE
well, the thing is that maya is a void so the laws of real physics doesn't really apply

This is all consistent to physics. And yes they apply. you just need forces to enforce this. Problem that you are seeing is the NSolvers built in drag that slows things down. And this drag is there to simulate air.

Unlike normal dynamics nparticles by default assume something akin earth like conditions whereas normal dynamics assume space. So the drag attribute under conserve needs to be 0 too otherwise whet you describe will happen. The default of 0.01 is going to diminish intial forces.

Conserve should allways be 100% and the amount of transfer should always be handled by other things than conserve.

QUOTE
i'm just saying it might be a bug

It not a bug

[zhenpanda]

dude thanks...i don't know anything T.T....
cries....

[zhenpanda]

ok...i tried it but it still doesn't work...

i did one simulation with normal dynamics and key frame one particle
starting at frame 1 and colliding at frame 40 into a mesh
the particle bounce off after the collidion in the other direction...forever

but when i do the same simulation with nParticles it didn't work the particle just stop dead at the mesh
and when i did change the drag to 0, and bounce to like 10 it still stops dead.
why does it do that?
what I am missing?

[joojaa]

QUOTE(zhenpanda17 @ 01/20/09, 06:35 PM) [snapback]299267[/snapback]
what I am missing?

I dont know! I'm kindof limitted to your descriptions. So if theres something your missing then that something is going to be pure guesswork for me. Ill try to make a script so you can do sanity test just as soon as i can get maya installed. (ive got a new system)

[zhenpanda]

well...i have a link to a youtube video

http://www.youtube.com/watch?v=xVbixKO3VMA

in this video....the big particles are nParticles that's keyFrame animated...see how the conserve isn't working
the particles just stop

the medium size particles are also nParticles that's animated by a goal....a locator is the target
but the conserve does work and both particles continues to move

the 3rd and smallest particles are the normal dynamics particles...it's keyFrame animited to hit that box which is a active rigid body...even when it's keyFrame just the same way as the Big nParticles next to it....the energy and conserve still stays

now i did what you said to take off drag...air...and all things that might eat up the conserve and change the bounce to 10 but it still isn't behaving the same way as normal dynamics particles