"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Paul Bourke" <pau### [at] gmailcom> wrote:
> > Any ideas why this scene
> >    https://paulbourke.net/transient/povray/
> > crashes once "theradius" gets past a certain value, eg: 0.6. There are no
> > coincident points, running version 3.7 on MacOS. Tonnes of RAM (192GB) and only
> > a fraction is used.
> > And more importantly, how to fix or get around it?
>
> I would say that you're pushing up against certain hard-coded values in 3.7.
> Also, people have made a very good (and non-obvious) point about the disc object
> having an inside.
>
> Although you could use cylinders, I used spheres, but I put them all inside a
> blob {} statement to get a speed boost from the special bounding mechanism.
>
> It takes maybe 15 sec to parse that huge inc file, and then FOR-EVER to try and
> render it.
> That's coming from the transmit values in your pigment map.
> Setting all of those to 0 allows the scene to render in 45s on my machine.
>
> The only other things I can think of to perhaps make the scene render faster and
> with less memory usage, are to sort the disc/sphere/blobs by color (perhaps with
> some rounding) so that you can use a single texture statement for each group of
> similarly colored object, thereby saving memory.
> Also, you could sort by distance from the camera, and only give the nearest
> objects a transmit pigment, so you wouldn't have so many layers of transmit to
> deal with, though perhaps setting max_trace_level to a lower value would
> essentially accomplish the same task.
>
> Pretty cool idea - and I hope to see the final animation once it's all working!
>
> - BW

Thanks for the suggestions. I am now rendering in 3.8, only takes about 20s and
that's with an even bigger inc file. But speed isn't an issue for me, at least
with 3.7 since I can distribute it. The 3.8 I downloaded has the gui (MacOS), is
there a pure command line for 3.8? Can't efficiently do a distributed render
with the gui.

See previous message, tried cylinders and spheres (3.7), same problem.

There are also nasty defects in the 3.8 render (discs), see attached example
frame. Strange they are mostly on the right half, it's those narrow dark
slivers. Perhaps they are a cue to what's happening.

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