Chris:

Thanks for providing this information.

Here are some more details from my end:

The particles seem doubled in size, or more specifically, perhaps, stretched
in the direction of the initial velocity.

I'm not using particle_stretch.  Whenever I start playing around with
something new, I usually comment out everything I can and just change one or
two things at a time and I hadn't tried particle_stretch yet.

I haven't tried to do an animation with your patch yet.

If it makes any difference, I'm running the Windows version and have had the
same things show up under Win95 and NT 4.0.

Best,

Mike Wilson

Chris Huff wrote:

> In article <39730597.FC0ED7E0@iastate.edu>, Mike Wilson
> <maw### [at] iastateedu> wrote:
>
> > I've also had it do screwy things where the render is very slow and the
> > particles seem like they are doubled.
>
> What do you mean by "doubled"? Are there twice as many particles as
> there should be? Are they twice the size they should be?
>
> > Also changing apparently unrelated code (e.g. camera angle statement)
> > can cause an error in "Minverse".
>
> Interesting...are you using particle_stretch? I think I need to add some
> error checking to it, because it won't work with particles that aren't
> moving...but particles usually are moving.
>
> > In all cases, simply trying the render again without changing
> > anything seems to work ok.
>
> Has it ever happened in an animation?
> I have encountered problems with the slow rendering, but never when the
> first render went fine. It seems like if one render goes correctly, all
> of them will until you quit the program...
>
> > I also discovered that specifying a pigment pattern for temperature
> > in the particle_system block will cause a system crash unless you
> > specify a color_map to go with it.
>
> Sounds like a possible problem with the pigment pattern...though I will
> check the temperature pigment, just in case.
>
> > Mass seems backwards to me.  Making the particles heavier seems to
> > make them more buoyant.
>
> That is because the gravitational force doesn't take mass into
> account...I will fix that. Gravitational acceleration should be
> constant, but currently, gravitational force is constant. Mass should
> behave properly with other forces, though, and gravity works fine on
> particles with a mass of 1.
>
> --
> 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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