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danb
07-10-2005, 03:03 PM
Have you seen the Honda civic commercials where cars surrounding the civic are expelling dollar bills from there exhaust pipes and the bills dynamically bounce off the civic?

Well i've been trying to do that for some time now with no success.

So i'm challenging everyone else to do this too.

neonghost
07-10-2005, 03:29 PM
good challenge. clothilde doesn't really work as there is no seed for turbulence, thus all copies or particles of a note follow the same path. You could write an xpression which randomly modifies the wind force and turbulence values of a stack of duplicates (stacked in the same position pre-empting exhaust) without changing the driving wind direction force too much. The deviations created by this should be enough to create lots of variation when they encounter the car collision proxy.

danb
07-10-2005, 04:17 PM
That sounds pretty good. I think i'll have a go at it.

Do you think that this would take years to simulate because of the clothilde calculations?

Rantin Al
07-10-2005, 04:38 PM
The mighty Fizz might be the way to go as it has Particle>Particle & Particle>Polygon collision detection.
Maybe adding a bit of elasticity to the attraction and repulsion fields to get the turbulence.

Cheers, Al.

danb
07-10-2005, 06:29 PM
Yup i've tried Fizz. The problem isn't getting the particles to react to turbulence and the car's surface its with the actually dynamics/soft body simulation of each bill.

Particles use instances of the particle object. These are not actual geometry so each duplication of a soft body bill will not simulate through dynamics.

I've also tried this with bones and soft ik, yet got the same result.

danb
07-10-2005, 06:47 PM
Wow it seems that i got it to work. :bounce:

If one uses clothilde with dynamics it works fine. Although there is a tedious bit of work setting up each bill.

You have to attach a clothilde plane to a rigid body dynamic object, then run the simulation.

Although i can't get my rigid body object to rotate when coliding with other rigid bodies.

Can anyone help with that?

JamesMK
07-10-2005, 07:23 PM
Although i can't get my rigid body object to rotate when coliding with other rigid bodies. Can anyone help with that?
Just set a lower rotational mass for them (mass tab in the RBD tag) try 5 - 25% and see if that doesn't make them more prone to some fun rotations.

danb
07-10-2005, 10:31 PM
Yeah that worked great.

Now if there a way to generate hundreds of these little bills with the dynamic tags already attached.

artemesia66
07-11-2005, 04:17 PM
Would the Instance Maker node (by base80 and MAJOUL) help you at all? It's available in Darter's Wavemaker expression in another thread.

chinnr
07-11-2005, 05:39 PM
Any chance we could see your results so far?

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