yade-users team mailing list archive

[boon chiaweng <booncw@xxxxxxxxxxx>]

Presently, I am very 'lost'... I have just started DEM.  YADE is my first DEM software.    I've just started my Phd and the topic is open (cuz i'm not doing sth on a funded project)... In fact, i've not decided what project to do yet.  i have to consider also the 'technical' difficulties when deciding a topic.  The community is my only source of help.   Some things are v difficult and may have to be abandoned, e.g. the algorithm to generate rock blocks from joint planes (like 3Dec, not PFC).

 

I was looking at ellipsoids..On google, found these websites:

http://local.wasp.uwa.edu.au/~pbourke/miscellaneous/implicitsurf/

http://www.frank-buss.de/lisp/polygonizer.html

When I come to think of it (still thinking), if i use some weird shapes to do simulation, and do some experimental calibration = PhD dissertation?  I think i'll have to finalize what i'll be doing for my phd soon <headache>...

 

 

Yours,

 

CWBoon

 


From: gladky.anton@xxxxxxxxx
Date: Fri, 20 Nov 2009 18:15:01 +0100
To: yade-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Yade-users] New particle shape

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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