| Particle represetation [message #35034] |
Fri, 09 May 2003 09:51  |
user
Messages: 8
Registered: August 1999
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Junior Member |
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Hi,
Does anyone know of a simple way of creating an _irregularly_ spaced
particle representation from a _regularly_ spaced grid? I have a 2D
grid with density values (tends to be close to a Gaussian profile), and
I then want to represent this using a finite number of point masses,
each having the same mass, but with a general position. The initial
density profile will then be represented by the spacing of the points,
each containing an equal amount of the mass. For some reason I thought
IDL had routines suitable for this, but I can't seem to find any.
I plan to use these as tracer particles, injected onto a regular grid,
so I will create a linked list containing a unique particle identifier,
its position in 3D space, pressure, energy etc., and then it will be
moved around by the velocity vectors living on the hydro grid.
Any ideas received with thanks,
Henrik
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| Re: Particle represetation [message #35263 is a reply to message #35034] |
Wed, 21 May 2003 22:52  |
Paul Sorenson
Messages: 48
Registered: May 2002
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Member |
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IDL's SURFACE command does not require absolutely regular xy locations. I
don't think IDLgrSurface does either. Also, see the d_surfview.pro demo for
an example displaying a surface (grid) as points rather than lines. (Menu
choice Options|Style|Point.)
If you have very irregular xy locations, you could draw PLOTS points or Orb
objects at each location.
Hope that helps,
-Paul Sorenson
<user@domain.invalid> wrote in message
news:b9gmav$jo3$1@titan.btinternet.com...
> Hi,
>
> Does anyone know of a simple way of creating an _irregularly_ spaced
> particle representation from a _regularly_ spaced grid? I have a 2D
> grid with density values (tends to be close to a Gaussian profile), and
> I then want to represent this using a finite number of point masses,
> each having the same mass, but with a general position. The initial
> density profile will then be represented by the spacing of the points,
> each containing an equal amount of the mass. For some reason I thought
> IDL had routines suitable for this, but I can't seem to find any.
>
> I plan to use these as tracer particles, injected onto a regular grid,
> so I will create a linked list containing a unique particle identifier,
> its position in 3D space, pressure, energy etc., and then it will be
> moved around by the velocity vectors living on the hydro grid.
>
> Any ideas received with thanks,
>
> Henrik
>
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