Re: A couple of RBD questions

["Morten Bartholdy" <xsi(at)colorshopvfx.dk>]

It sounds good André - I also need to do a load of smaller pieces of 
concrete and was just looking into ways to do that on top of my large piece 
simulation. I would be hvery grateful if you would pass me that script. 
Thanks a lot!

Cheers
Morten Bartholdy
3D & VFX Artist





----- Original Message ----- 
From: "André Adam" <a_adam(at)49games.de>
To: <XSI(at)Softimage.COM>
Sent: Wednesday, June 27, 2007 5:59 PM
Subject: Re: A couple of RBD questions


> I've just done something like this using a combination of scripting, 
> particles and RBDs. Basically I sketched a particle cloud, one particle 
> for each object, created a particle cloud with simulation props from the 
> sketched cloud, then created a cluster constraint from each object to its 
> corresponding particle and finally used this setup to shoot the rocks out 
> of the wall using the particle system. As soon as the rocks did not sit on 
> top of each other anymore I switched the rocks' RBD properties from 
> passive to active and let the RBD engine do the floor collisions. Worked 
> out nicely, with a script creating the particle setup from the selected 
> rocks in one go.
>
> If this workflow would be of help for you I could provide you with the 
> script to do the setup.
>
> Cheers!
>
>    -André
>
>
> Morten Bartholdy wrote:
> > I am breaking a wall with RBD and am using a set of pieces which are 
> > slightly smaller then the ones I want to render so I can avoid 
> > interpenetration in the beginnnig of the simulation. Now I know I can 
> > transfer the cache to a clip in the mixer, but if I want to copy this 
> > motion to each renderpiece or constrain these to the RBD'ed pieces it 
> > starts looking a bit complicated. If I create a cluster with center my 
> > RBD is shot. Next thing I would try is to multi point constrain my 
> > renderpiece to the RBD piece but this requires me to create three 
> > clusters on each RBD piece and then three point constrain each 
> > renderpiece to those. Please tell me Softimage thought of easier ways to 
> > handle something like this with up towards 100 separate RBD pieces???
> >  Another thing is my pieces tend to explode a bit away from each other 
> > even though I have made absolutely sure there are no interpenetrations at 
> > the bewginning of the sim. I have increased simulation and collision 
> > acuracy to very high levels without quite getting rid of this behaviour. 
> > Also I have elasticity all the way down to 0.001 since these are supposed 
> > to look like concrete pieces, but I still get weird styrofoam like bounce 
> > and sploinng-like fly away behaviour from the odd piece when it collides 
> > with something again after landing on the ground. I have tried messing 
> > with friction parameters without much luck.
> >  I am guessing there a tips and tricks I still need to learn about the 
> > wonderful world of RBD'ing so if someone knows a way to dampen simulation 
> > collisions I would be happy to hear them, if someone in the know cares to 
> > share some insight.
> >  Thanks!
> >  Morten Bartholdy
> > 3D & VFX Artist
>
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