[Sidefx-houdini-list] RBD Objects

François Duchesneau sidefx at trinix.ca
Thu Mar 13 09:25:21 EDT 2008

RBD uses a mechanism called SDF (Signed Distance Field) for their 
collision. But you can also use primitive as bounding volume, a sphere 
or a box. In your case I would use an implicit box.

However I think you'll have to subdivide you individual card mesh to 
make sure enough point can collide with that implicit box. You can bring 
the subdivided version inside Dop and still use the original one in Sop, 
i.e. in Houdini what you simulate doesn't have to be what you see. Look 
at the "ProxyGeometry" example card.

Since each card must have the same size you could use an instance 
mechanism in Dop to avoid recalculation of each RBD but this could be 
more complicated.


Chandra Maharzan wrote:
> Hi Marshall,
> This was very helpful. But now I have this intersecting problem. The cards
> are going through each other. Is there anyway to prevent that? 
> Thanks,
> Chandra
> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com
> [mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Marshall
> Petersen
> Sent: Thursday, March 13, 2008 3:12 PM
> To: sidefx-houdini-list at sidefx.com
> Subject: Re: [Sidefx-houdini-list] RBD Objects
> What you want to do is use the RBD Glue or RBD Fracture. This will create
> individual RBD object from groups. Just be sure that Create Output Groups is
> checked in the Copy SOP and the expression uses $PT instead of $CY and you
> should be good to go.
> ~Marshall
> On Thu, Mar 13, 2008 at 5:19 AM, Chandra Maharzan <chandra at digital.com.np>
> wrote:
>> Okay now I have a bridge made up of cards. They were copied over a curve
>> by
>> one card. What I want to do it make each of these copied cards a RBD
>> object
>> and put a wind / fan force to blow them away...
>> When I make RBD by selecting the brige, its one single RBD not separate
>> RBDs. Can anyone tell me how this can be achieved?
>> Thanks for the help again.
>> Chandra
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list

More information about the Sidefx-houdini-list mailing list