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Forum: Processes Involving Optical Photons
Re: Question Min step size for optical photons? (Pawel)
Re: Feedback Re: Min step size for optical photons? (Gumplinger Peter)
Date: 08 May, 2013
From: Pawel <Pawel>

Hello Peter,

thanks a lot for explanation. Now I'm sure that the biasing of my simulation is what I need, rather than a change of step length.

best regards

Pawel

On Tue, 07 May 2013 23:41:19 GMT, Gumplinger Peter wrote:

> Hello Pawel,
> 
> > I'm wondering whether there is a way to set the minimum step size
> > for produced photons to make tracking less accurate, but also less CPU
> > consuming? I've searched forum, but found only examples of setting
> > maximum step size, which is not the case. If such a possibility exists,
> > I'd be grateful for every hint.
> 
> The steps optical photons take during the simulation are already the
> minimum step size they can take. Optical photon steps are only limited
> by geometry and discrete processes. The geometry has to be interrogated
> to find the next volume boundary - I am not aware of any way to make
> this 'less accurate' but faster.
> 
> If you find the CPU consum prohibitive you may bias the number of
> optical photons you track. For example, you can remove every other
> photon in your UserStackingAction. This reduces the statistical accuracy
> but you may still get a result that is statistical significant for your
> setup.
> 
> Best regards, Peter
> 

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