In article <397363FD.44B2276A@peak.edu.ee>, Margus Ramst 
<mar### [at] peakeduee> wrote:

> Anybody have any success using the ipf_profile feature in Chris's patch?
> Running 0.2.5 (Windows compile), I get "Singular matrix in MInvers" 
> whenever I try to use ipf_profile (type 1 or 2). The simulation 
> completes OK, then parse exits with the aforementioned error.

My first thought is that NaN values are getting into the simulation 
somewhere, and messing up the particle stretch calculations.
There is a bug in the particle stretch feature, one of the variables is 
left uninitialized, so you have to manually turn it off by using 
"particle_stretch 0,0" if you don't want to use this feature. This will 
be fixed in the next version.

As for the ipf feature...my advice would be not to use it right now. It 
is still very imperfect, and I will be making some changes in the future 
to allow multiple fluid types. For one thing, the internal function 
doesn't work with falloff values below 1 or even values above 1. Since 
you used 2 as the exponent, it won't behave as it should.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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