# yade-users team mailing list archive

## Re: New particle shape

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```Could you not explain in generally, what do you want to simulate?
______________________________

Anton Gladkyy

2009/11/20 boon chiaweng <booncw@xxxxxxxxxxx>

>  Thank you, Janek.  May I know where can I find the marching cube algorithm
> in YADE?  And how is it used?  I'm really curious (one reason is i've spent
> days looking for the marching cube algorithm).  Although I'm still a novice,
> but I hope soon, I'll be a 'pro'.  If I am able to think of a shape that can
> be specified by an equation, and marching cube is available, it will save me
> a lot of trouble thinking of how to plot it.  Thanks~
>
>
> Really grateful,
>
> CW Boon
>
>
> > Date: Fri, 20 Nov 2009 16:32:31 +0100
>
> > From: janek_listy@xxxxx
> > To: yade-users@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Yade-users] New particle shape
> >
> > boon chiaweng said: (by the date of Fri, 20 Nov 2009 22:00:20 +0800)
> >
> > >
> > > There should be advantages in polygonizing an arbitrary equation. While
> looking for solutions for graphics, there are weird shapes that can be drawn
> using implicit equations.. I can't recall what shapes but they were
> recommending the "marching cube" algorithm.. In the OpenGl file for sphere,
> are the vertices and faces a general polygonization method for any equation?
> Or is it only for a sphere-type particle? I'm a novice in this.
> >
> > don't go into this direction unless you are more interested in
> > computer graphics than in ellipsoid interactions. In fact we even
> > have marching cubes implemented somewhere, but in your case a simple
> > drawing of a sphere scaled in radiusX,radiusY,radiusZ will just work.
> >
> >
> > > How do I make sure that, with time, OpenGL's orientation on the user
> interface is same as the quaternion which is used in calculation?
> >
> > It is the same variable. So it is equal to itself :)
> >
> > --
> > Janek Kozicki |
> >
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```

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