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Re: New particle shape
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:
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>...
Date: Fri, 20 Nov 2009 18:15:01 +0100
Subject: Re: [Yade-users] New particle shape
Could you not explain in generally, what do you want to simulate?______________________________
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~
> 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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