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Re: IDLy approach to splatting points on a grid? [message #51462]

Fri, 24 November 2006 14:02

Jonathan Dursi
Messages: 9
Registered: November 2006

Junior Member

Hi, Ed:

Thanks for the reply...

Your assumptions were:

> 1) your problem actually is 2-D, and
> 2) you really want square windows (not radii? really?), and
> 3) each particle has BOTH a radius of influence AND a value it contributes.

#3 is completely right, your hunch in #2 that I really want round
windows is correct (but I'm willing to do the function evaluation and
get zero in the corners to simplify things), and for #1, it will often
be the case that this will be a 2d thing, but the ability to also
handle 3d would certainly be a big benefit.

I like your brainstorming approach; I hadn't `gone there' with the 3
indexed arrays because it's not feasible (in general there's on order a
million or so particles) but I think that's a good start; in
particular, I think that in that approach likely likes the nucleus of
how to do this in with sparse matricies.

It's straightforward to find out within which cell each particle lives,
so that instead of examining the whole grid, one could only consider
the window directly... but since some particles will have huge windows,
and most very small ones, I'm not sure that helps... Still, the
answer's in there somewhere, the hour is just too late for me to come
up with it. I'll play with this some more tomorrow.

Jonathan

--
Jonathan Dursi
ljdursi@cita.utoronto.ca

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		Re: IDLy approach to splatting points on a grid? By: Jonathan Dursi on Fri, 24 November 2006 14:02
		Re: IDLy approach to splatting points on a grid? By: MarioIncandenza on Fri, 24 November 2006 10:52
		Re: IDLy approach to splatting points on a grid? By: Jonathan Dursi on Thu, 23 November 2006 04:04

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