[Sidefx-houdini-list] exploding trees

Adrian Lee dryrainstudios at gmail.com
Tue Sep 23 14:01:32 EDT 2014


Thanks Nikola. I was thinging about something like this. Just tried a
straight negative peak. But i am going to try something a but more
intelegent based on piece size

On Tuesday, 23 September 2014, Nikola Djordjic <neronicolo at gmail.com> wrote:

> This is not exactly what you want bu here is an idea.
> You can shrink your objects based on normal (or gradient), then you will
> have pieces with some space in between.
> Use that geo for siming and cache as points, then copy your original not
> shrinked geo to points.
> This way you will be sure there is no interpenetration between objects.
>  NIkola
>
> On Tue, Sep 23, 2014 at 4:55 PM, Adrian Lee <dryrainstudios at gmail.com
> <javascript:;>>
> wrote:
>
> > Morning boys and girls
> >
> > Im trying to explode a thinish tree using bullet but im having un wanted
> > explosions I suspect from interpenetration and using concave instead
> > convexed colision geo. Convex gives an ok result but not ideal.
> > The tree was a rush job from paintfx which has been re topologised and re
> > meshed in zbrush and appeard pretty water tight.
> > Some of my issues come from the fracturing but I have used the
> > tetrahedralize to find and fix interpenertration but the tree still
> > explodes on frame 1 with Concave colisions.
> > Its a small tree roughly 2x3x3 h.units with thin but not dense branches
> > Any tricks? Can I shrink the collision volume some how like you can with
> > convex. To stop the inter penertration?
> > Any help would be great.
> > Thanks
> >
> >
> > --
> > Adrian Ed Lee
> >
> >
> > Dryrainstudios.com
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-- 
Adrian Ed Lee


Dryrainstudios.com



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